Date   

Re: AP1100 autoguiding

Roland Christen
 

Got a link to some images?

Couple years ago we built a 17" F8 Cassegrain Astrograph that we are using to test our larger mounts. It's carbon fiber, quartz optics and very light weight. Robert, our designer, came up with a unique mechanical assembly that allows one person (me, even) to place the scope on the mount. The thin mirror design required an expert optician to polish and figure - we tried the usual sources for large optics since we don't have the facilities to make a 17" mirror. The result was both poor figure and fairly large astigmatism.

So I contacted Mike at Lockwood Custom Optics, and he knew just how to make a perfect light-weight quartz mirror. It came out super accurate, easily <10th wave with a surface so smooth it makes a baby's bottom resemble the Dakota Badlands. I made the rest of the optics, the 7" secondary and the 2 element field corrector. Because it is not an RC with Hyperbolic primary and secondary, it is super easy to collimate and holds collimation all seasons, regardless of temperature.

So, when the 16" RCs started to appear from China for little more than a song, I was quite distressed to say the least. No way to compete with that. At least Mike has tons of work making fast large mirrors for Newtonians, up to 50", and those who are in the know are lining up for them.

Would I ever build an RC scope with hyperbolic mirrors? No. Cannot be made smooth enough or accurate enough for my tastes.

Rolando


-----Original Message-----
From: Emilio J. Robau, P.E. <ejr@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 2:45 pm
Subject: Re: [ap-gto] AP1100 autoguiding

I think  Roland is pointing out the unforgiving nature of the 2.45 or 3.75 micron chip.   I run my 12" GSO with a 16200 chip at 2x2 bin and it produces some smooth images at 2000 mm.  Very forgiving setup.

--
Roland Christen
Astro-Physics


Re: AP1100 autoguiding

Emilio J. Robau, P.E.
 

I think  Roland is pointing out the unforgiving nature of the 2.45 or 3.75 micron chip.   I run my 12" GSO with a 16200 chip at 2x2 bin and it produces some smooth images at 2000 mm.  Very forgiving setup.


Re: AP1100 autoguiding

 

>>> I'm hoping this 10" will be good as is.

i would not count on it arriving being properly collimated

I own 2 GSO RC scopes (10" and 12") and also talking with many others this seems par for the course

The suggestion of getting a tak collimation scope is a good one



On Thu, May 19, 2022 at 12:04 PM Steven Panish <scpanish1@...> wrote:
Emilio and Kirk - Good to hear on both counts!  I have heard generally good things about the GSO mirrors.  My primary RC fear is collimation.  I'm hoping this 10" will be good as is.
Steve

On Thu, May 19, 2022 at 2:59 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Christopher
Yes, that has happened, but I wouldn't use the word 'berserk'.
If the secondary focuser shaft is kept well lubricated this doesn't happen.
The secondary focuser on my 12.5 f9 RCOS truss has never experienced this.
Kent Kirkley



-----Original Message-----
From: Christopher Erickson <christopher.k.erickson@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:35 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Just for general FYI, RCOS OTA's have terrible secondary mirror-based focusers that are notorious for going berserk and slamming into one extreme of the focus range and then jamming. Best fix is adding a Moonlight Crayford and stop using the secondary-based focus mechanism.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Thu, May 19, 2022, 8:29 AM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.



--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.




Re: AP1100 autoguiding

Emilio J. Robau, P.E.
 

Steven,

Get yourself a Tak Collimation Telescope.   I can collimate without it, but with it the collimation is very easy and very precise.   You can by them new from Cyclops optics for about 30% less than anywhere else brand new.

Now back on topic.  I do love all  my A-P equipment especially the AP1100 when my name is called and can't wait until Rolando slips and gives us another clue or actually announces that great new product.


Re: AP1100 autoguiding

Roland Christen
 

That was before the days of 3.75 micron pixels, when most cameras were operating at 9 microns.



-----Original Message-----
From: Kent Kirkley via groups.io <kgkirkley@...>
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Sent: Thu, May 19, 2022 1:19 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.

--
Roland Christen
Astro-Physics


Re: AP1100 autoguiding

Steven Panish
 

Emilio and Kirk - Good to hear on both counts!  I have heard generally good things about the GSO mirrors.  My primary RC fear is collimation.  I'm hoping this 10" will be good as is.
Steve

On Thu, May 19, 2022 at 2:59 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Christopher
Yes, that has happened, but I wouldn't use the word 'berserk'.
If the secondary focuser shaft is kept well lubricated this doesn't happen.
The secondary focuser on my 12.5 f9 RCOS truss has never experienced this.
Kent Kirkley



-----Original Message-----
From: Christopher Erickson <christopher.k.erickson@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:35 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Just for general FYI, RCOS OTA's have terrible secondary mirror-based focusers that are notorious for going berserk and slamming into one extreme of the focus range and then jamming. Best fix is adding a Moonlight Crayford and stop using the secondary-based focus mechanism.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Thu, May 19, 2022, 8:29 AM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.



--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: AP1100 autoguiding

Kent Kirkley
 

Christopher
Yes, that has happened, but I wouldn't use the word 'berserk'.
If the secondary focuser shaft is kept well lubricated this doesn't happen.
The secondary focuser on my 12.5 f9 RCOS truss has never experienced this.
Kent Kirkley



-----Original Message-----
From: Christopher Erickson <christopher.k.erickson@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:35 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Just for general FYI, RCOS OTA's have terrible secondary mirror-based focusers that are notorious for going berserk and slamming into one extreme of the focus range and then jamming. Best fix is adding a Moonlight Crayford and stop using the secondary-based focus mechanism.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Thu, May 19, 2022, 8:29 AM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: AP1100 autoguiding

Emilio J. Robau, P.E.
 

I am very critical of much of the Chinese manufactured astro-photography goods, especially the ZWO cameras.   

However, I have to say that my 12" Truss GSO RC is my favorite poor man's telescope.  I had to extend the baffle to eliminate some stray light.   I have an APH-H chip on it and it really rocks.   I use a SI focuser and an AP27TVPH to get it down to about F6.7 or so and I really enjoy that scope.   I also have a Tak collimation scope and can get that thing very well collimated very quickly and it holds collimation in my observatory forever.   I have taken it completely apart to replace the fans and put it back together again and with about 30 to 45 minutes of collimation time, am back in business.  I am going to guess that my mirrors are pretty good at least to my untrained eye.   Pixel peepers may find faults with the field, but I am very happy with it.

I have my real money saved up for AP stuff, and the RC will be the last item to be replaced for a high end unit one day.  However for now and the past six years I do consider my GSO 12" RC with the baffle mod and a SI focuser as the best value scope I own.  I would purchase one again without hesitation.


Re: AP1100 autoguiding

Steven Panish
 

Unfortunately no, it's a cheap one, a GSO.   RCOS are available in 10", and If I like the cheap one I may go for the RCOS.  My dome is too small for anything larger.   Bad mistake.
Steve

On Thu, May 19, 2022 at 2:29 PM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.



--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: AP1100 autoguiding

Christopher Erickson
 

Just for general FYI, RCOS OTA's have terrible secondary mirror-based focusers that are notorious for going berserk and slamming into one extreme of the focus range and then jamming. Best fix is adding a Moonlight Crayford and stop using the secondary-based focus mechanism.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Thu, May 19, 2022, 8:29 AM Kent Kirkley via groups.io <kgkirkley=aol.com@groups.io> wrote:
Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: AP1100 autoguiding

Kent Kirkley
 

Steven
I hope the "RC" is one of the great ones; ie. An RCOS which were/are incredibly stable.
RCOS' motto was "Focus and forget it", as well a no optical flexure issues.
If a Chinese RC, you probably won't experience this.
Kent Kirkley



-----Original Message-----
From: Steven Panish <scpanish1@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 1:06 pm
Subject: Re: [ap-gto] AP1100 autoguiding

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J


--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: AP1100 autoguiding

Christopher Erickson
 

When adjusting cone error on OTA's, I often make thin shims from the sides of aluminum pop cans. They are easily cut with scissors and paper punches. And don't stack too many shims together or you might end up with a slightly compressible spacer that will introduce some additional flexure.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Thu, May 19, 2022, 8:06 AM Steven Panish <scpanish1@...> wrote:
Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J



--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: AP1100 autoguiding

Steven Panish
 

Chris's points are good.  I'm hoping the RC arriving shortly will be stable. 
Steve

On Wed, May 18, 2022 at 1:32 PM Christopher Erickson <christopher.k.erickson@...> wrote:
Dovetail bars and radius blocks or rings are just about always quite a ways farther apart than the ends of dovetail brackets and hence a better place to attempt fine adjustments of cone error. Further, the actual error is almost always in the OTA and its support structure, not the mount and dovetail bracket. Routinely swapping OTA's on the same mount (as I often do) would be a real problem.

And make sure that OTA is precisely collimated before attempting any cone error adjustments.

And a compound OTA with a floating primary might have a lot of variability in its cone error as it points around the sky and shifts the primary mirror's orientation to gravity.

-Christopher Erickson
Observatory engineer
Waikoloa, HI 96738
www.summitkinetics.com
   

On Wed, May 18, 2022, 5:06 AM Andrew J <andjones132@...> wrote:
On Sun, May 15, 2022 at 02:40 PM, Steven Panish wrote:
Unfortunately it is rare  to find cone adjustment screws actually on plates or rings. 
@steven Panish. You make a good point. I wish the saddle plates came with adjustment screws to be able to correct for cone error. It would be so easy to adjust if there where screws that would allow you to adjsut the angle of the dovetail plate in the saddle. Shims are OK, but it woudl be much easier if this was built into the saddle plate. Just my 2 cents....

Andrew J



--
PLEASE NOTE MY NEW EMAIL ADDRESS!!!
Due to Google eliminating cheap domain serving, Virginia and I are changing to regular gmail addresses.  The old panishnet address will forward to this address for a short while, but please add the new address, scpanish1@..., to your contact list.


Re: [ap-ug] ZWO color camera problem - Update

Roland Christen
 

It's a 6200C astro-imaging camera which has a color chip. It does not have a shutter, so can take exposures as fast as .001 seconds as well as video. Same chip is used in high end Canon digital cameras.

Roland

-----Original Message-----
From: M Hambrick <mhambrick563@...>
To: main@ap-gto.groups.io
Sent: Thu, May 19, 2022 4:31 am
Subject: Re: [ap-gto] [ap-ug] ZWO color camera problem - Update

Is the ZWO camera an astro-imaging camera ? Out of curiosity what kind of exposure time do you have to use to take images of objects during daylight, or is there something you have to do with the stretching ?

Mike

--
Roland Christen
Astro-Physics


Re: JPL Horizon wont launch in APCC

Peter Gottstein
 

The newest update of apcc did the trick. Thank you everybody. 


Re: [ap-ug] ZWO color camera problem - Update

thefamily90 Phillips
 

I use ZWO monochrome and color cameras for all my Lunar, planetary and solar images. I have never done any imaging, except solar, during daylight hours.

JimP 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of M Hambrick <mhambrick563@...>
Sent: Thursday, May 19, 2022 5:31:59 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] [ap-ug] ZWO color camera problem - Update
 
Is the ZWO camera an astro-imaging camera ? Out of curiosity what kind of exposure time do you have to use to take images of objects during daylight, or is there something you have to do with the stretching ?

Mike


Re: [ap-ug] ZWO color camera problem - Update

M Hambrick
 

Is the ZWO camera an astro-imaging camera ? Out of curiosity what kind of exposure time do you have to use to take images of objects during daylight, or is there something you have to do with the stretching ?

Mike


Re: ZWO color camera problem

Calypte
 

Hmm.  I have a ZWO 2600 MCP that I bought several months ago.  My original intent was to do a Hyperstar setup, totally independent of my observatory.  But nobody has scopes.  I've only tested the 2600 MCP to the extent of plugging it in and seeing that the LED lights up.  I haven't looked at this forum much recently.  You now have my attention.  I'll be following your posts about this.


Re: AIC 2022

Calypte
 

When they announced that AIC registration was open, I was within minutes of signing up.  But then I got an invitation for a major family event on the same weekend.  Family comes first.  I know another regular attendee who now lives in Oz, and he informed me that he won't be going to AIC, either.  Family matters back in the UK for him.  Had I signed up, I would have been sorely disappointed at not seeing the fine crew from Astro-Physics.  But knowing that you guys won't be there mitigates my personal regret at not attending AIC.  I hope they get a good turnout anyway.  I look forward to trying again in a couple of years, or whenever they schedule the next one.


Re: [ap-ug] ZWO color camera problem - Update

Roland Christen
 

Hello fellow astronuts,

I could not get deep sky images to come out right with this color camera. So I went back to basics and imaged a known daytime object with known colors. Ross was right, the key really was the X and Y offset numbers. As you can see below, with X and Y set to 0, the colors of blue and red are reversed. With X and Y set to 1, the proper colors appear on the daytime shots of the water tower. The preview image of the star doesn't change, and it was difficult to see the changes on a deep sky object. But now my galaxies have red cores instead of blue.

So, I thank Ross again for pointing out the solution, and although I am a little dense, I can sometimes find the Reese's cup hidden in the back of the cupboard.

Rolando






-----Original Message-----
From: Ross Salinger <rgsalinger@...>
To: main@ap-ug.groups.io
Sent: Wed, May 18, 2022 2:34 pm
Subject: Re: [ap-ug] ZWO color camera problem

MaximDL gives you a little 2 field popup that lets you choose 1 or 0 in each box. Go through all 4 possibilities and one should look pretty good. My own experience with MDL is that they have gotten way behind the curve with regards to these cameras. 
See below.
On 5/18/2022 12:30 PM, Roland Christen via groups.io wrote:

Sounds like the color matrix is set wrong in Maxim-DL
yes, but I can't see any way to change it in Maxim.

Roland

-----Original Message-----
From: Stacey Mills <w4sm@...>
To: main@ap-ug.groups.io
Sent: Wed, May 18, 2022 2:12 pm
Subject: Re: [ap-ug] ZWO color camera problem

Sounds like the color matrix is set wrong in Maxim-DL.  I use PixInsight.  I believe the ZWO matrix is "RGGB."  PixInsight has an option for a "BGGR" matrix which seems to be what you're encountering since red and blue are switched.. 

--
Roland Christen
Astro-Physics

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