Date   

Re: Meade lx 200(off topic help)

Suresh Mohan
 

Thank you I just posted there .
Regards 
Suresh 


On Apr 6, 2016, at 11:43 PM, 'Christopher Erickson' christopher.k.erickson@... [ap-gto] <ap-gto@...> wrote:

 

IIRC, PEC was programmed at the factory in the Classic LX200 and couldn't be easily changed.
 
You should join the LX200-Classic Yahoo group and ask your questions there.
 
 

Christopher Erickson
Consulting Engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com

 


From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 5:35 AM
To: ap-gto@...
Subject: [ap-gto] Meade lx 200(off topic help)

I will be goinf this weekend to a hill station , my daughter is tagging along .I would be uisng my Mach1 and she would use the LX 200 classic on a wedge .I havent used the mount in ten years, i started the mount and it works fine . I need help in the following aspects. How do i do a PEC in lx 200.?
I remember a procedure if u wanted a nearby galaxy to be bang in centre u had to press a series of buttons for eg i go to alkaid ,centre it and then move on to m 51
Does anyone remember( those who have used the lx 200)
Sorry if the question is invalid in the group
Suresh


Re: solar filters

Christopher Erickson
 

Personally I have a Coronado 40mm filter set, a Daystar Quark, a mess of Orion glass filters and a roll of Baader visual film.
 
The Coronado gives the best solar views, followed by the Quark, followed by the glass filters and the film in last place.
 
I have tried a wedge but do not own one.  It seemed about on-par with the glass filters to me.

Christopher Erickson
Consulting Engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com

 



From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 3:14 AM
To: ap-gto@...
Subject: Re: [ap-gto] solar filters

Hi,

I'd suggest as a (cheaper) still-quite-good alternative:


Two versions: one for visual, one for photography...

The wedges are a bit better, but... be aware of the potential problem of backfocus with the wedges... check your system's focus distances before buying... ;-)

Don't go for glass filters...

Erik.


From: "Craig craig@... [ap-gto]"
To: ap-gto@...
Sent: Wednesday, April 6, 2016 1:35:34 PM
Subject: Re: [ap-gto] solar filters

 


A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success.  The solar load on a quality refractor is no problem so long as the scope has front lens elements only.  You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need. 

Of course you can only use a wedge with a refractor!

-Craig


On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote:

 


Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

 

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 





Re: Meade lx 200(off topic help)

Christopher Erickson
 

IIRC, PEC was programmed at the factory in the Classic LX200 and couldn't be easily changed.
 
You should join the LX200-Classic Yahoo group and ask your questions there.
 
 

Christopher Erickson
Consulting Engineer
Summit Kinetics
Waikoloa, HI 96738
www.summitkinetics.com

 



From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 5:35 AM
To: ap-gto@...
Subject: [ap-gto] Meade lx 200(off topic help)

I will be goinf this weekend to a hill station , my daughter is tagging along .I would be uisng my Mach1 and she would use the LX 200 classic on a wedge .I havent used the mount in ten years, i started the mount and it works fine . I need help in the following aspects. How do i do a PEC in lx 200.?
I remember a procedure if u wanted a nearby galaxy to be bang in centre u had to press a series of buttons for eg i go to alkaid ,centre it and then move on to m 51
Does anyone remember( those who have used the lx 200)
Sorry if the question is invalid in the group
Suresh


Re: solar filters

Woody Schlom <woody@...>
 

Mike,
 
What's this about a wedge not allowing photography?  Who/what gave you that idea?
 
Of course you can image with a wedge.  In fact, Baader makes two versions of their Herschel Wedge, the "V" version for visual, and the "P" version for photography.  The difference is the "P" version comes with more ND filters.   Cameras can take more brightness than our eyes, so in the "P" version, Baader includes a couple of less-dense ND filters exclusively for photography.
 
I'll even go as far as saying Herschel Wedges are BETTER for imaging.  So far as I know, Herschel Wedges are the best for white-light solar viewing and imaging.  But yes, they're also the most expensive.
 
Also note that the Baader Herschel Wedges come with the greenish Baader Continuum filter.  You'll have to spend an additional $100 or so to add a Continuum filter to a Lunt wedge -- which seriously narrows the price difference between the two brands.
 
Woody.
 
 

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 6:47 AM
To: ap-gto@...
Subject: RE: [ap-gto] solar filters

 

Thanks...but a wedge would not allow any photography/imaging and is more than I want to spend on something that will not get used much.

Thank you

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west. Can it be half

a year since I watched her April rising in the east? Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

International Dark Sky Association: www.darksky.org

From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 4:36 AM
To: ap-gto@...
Subject: Re: [ap-gto] solar filters

A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success. The solar load on a quality refractor is no problem so long as the scope has front lens elements only. You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need.

Of course you can only use a wedge with a refractor!

-Craig



On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] wrote:

Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west. Can it be half

a year since I watched her April rising in the east? Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

International Dark Sky Association: www.darksky.org

[Non-text portions of this message have been removed]


Re: solar filters

Woody Schlom <woody@...>
 

Erik,
 
I don't think back-focus distance will be a problem on a 160mm scope!  It's when you go with a short focal-length scope you run into back-focus problems.  And at least with the Baader, there's a "secret" way to gain around 3/4" in back-focus distance -- you replace the Baader 2" Click-Lock with Baader T2 threaded fittings.
 
Woody
 

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 6:14 AM
To: ap-gto@...
Subject: Re: [ap-gto] solar filters

 

Hi,

I'd suggest as a (cheaper) still-quite-good alternative:


Two versions: one for visual, one for photography...

The wedges are a bit better, but... be aware of the potential problem of backfocus with the wedges... check your system's focus distances before buying... ;-)

Don't go for glass filters...

Erik.


From: "Craig craig@... [ap-gto]"
To: ap-gto@...
Sent: Wednesday, April 6, 2016 1:35:34 PM
Subject: Re: [ap-gto] solar filters

 


A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success.  The solar load on a quality refractor is no problem so long as the scope has front lens elements only.  You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need. 

Of course you can only use a wedge with! a refractor!

-Craig


On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote:

 


Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

 

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 





Re: solar filters

observe_m13
 

Huh? There is nothing better in my opinion. Really. The Baader Herschel Wedge is THE solar accessory for white light and Ca imaging.


---In ap-gto@..., <mshade@...> wrote :

Thanks...but a wedge would not allow any photography/imaging and is more than I want to spend on something that will not get used much.



Thank you



Mike J. Shade: mshade@...

Mike J. Shade Photography:

mshadephotography.com



In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west. Can it be half

a year since I watched her April rising in the east? Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: <http://www.darksky.org/> www.darksky.org



From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 4:36 AM
To: ap-gto@...
Subject: Re: [ap-gto] solar filters





A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success. The solar load on a quality refractor is no problem so long as the scope has front lens elements only. You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need.



Of course you can only use a wedge with a refractor!



-Craig




On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@... [ap-gto] <ap-gto@...> wrote:



Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?



Mike J. Shade: mshade@...

Mike J. Shade Photography:

mshadephotography.com



In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west. Can it be half

a year since I watched her April rising in the east? Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: www.darksky.org <http://www.darksky.org/>







[Non-text portions of this message have been removed]


Meade lx 200(off topic help)

Suresh Mohan
 

I will be goinf this weekend to a hill station , my daughter is tagging along .I would be uisng my Mach1 and she would use the LX 200 classic on a wedge .I havent used the mount in ten years, i started the mount and it works fine . I need help in the following aspects. How do i do a PEC in lx 200.?
I remember a procedure if u wanted a nearby galaxy to be bang in centre u had to press a series of buttons for eg i go to alkaid ,centre it and then move on to m 51
Does anyone remember( those who have used the lx 200)
Sorry if the question is invalid in the group
Suresh


Re: solar filters

Stuart Heggie <stuart.j.heggie@...>
 

I was going to chime in as well saying that the Herschel wedge from Baader focused fine on my AP130EDT (same should be true for the 155EDF) and it comes in two forms one of which is 'P' i.e. Photographic. You need to be sure to get that one else it is just visual.

Stuart

On Wed, Apr 6, 2016 at 10:39 AM, jmagsaysay58@... [ap-gto] <ap-gto@...> wrote:
 

My Baader Herschel Wedge focuses on my Traveler, and have imaged with it.





Re: solar filters

stlrvus
 

My Baader Herschel Wedge focuses on my Traveler, and have imaged with it.


Re: solar filters

Mike Shade
 

Thanks...but a wedge would not allow any photography/imaging and is more than I want to spend on something that will not get used much.



Thank you



Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com



In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west. Can it be half

a year since I watched her April rising in the east? Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: <http://www.darksky.org/> www.darksky.org



From: ap-gto@... [mailto:ap-gto@...]
Sent: Wednesday, April 06, 2016 4:36 AM
To: ap-gto@...
Subject: Re: [ap-gto] solar filters





A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success. The solar load on a quality refractor is no problem so long as the scope has front lens elements only. You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need.



Of course you can only use a wedge with a refractor!



-Craig
On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote:



Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?



Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com



In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west. Can it be half

a year since I watched her April rising in the east? Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights



International Dark Sky Association: www.darksky.org <http://www.darksky.org/>


Re: solar filters

Craig Anderson
 

Good point on the backfocus. Both my AP155 and 130 GTO have plenty of backfocus for my 2" Baader wedge. My previous AP130 f6 also had plenty of backfocus. TeleVue scopes I've had in the past did not have have enough backfocus for a 2" wedge but we're fine for a 1.25" one. Personally, I wouldn't use a 1.25" wedge with more that 4" of aperture. 

Craig


On Apr 6, 2016, at 9:14 AM, erik.pylyser@... [ap-gto] <ap-gto@...> wrote:

 

Hi,

I'd suggest as a (cheaper) still-quite-good alternative:


Two versions: one for visual, one for photography...

The wedges are a bit better, but... be aware of the potential problem of backfocus with the wedges... check your system's focus distances before buying... ;-)

Don't go for glass filters...

Erik.


From: "Craig craig@... [ap-gto]" <ap-gto@...>
To: ap-gto@...
Sent: Wednesday, April 6, 2016 1:35:34 PM
Subject: Re: [ap-gto] solar filters

 


A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success.  The solar load on a quality refractor is no problem so long as the scope has front lens elements only.  You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need. 

Of course you can only use a wedge with a refractor!

-Craig


On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote:

 


Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

 

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 





Re: solar filters

erik.pylyser@...
 

Hi,

I'd suggest as a (cheaper) still-quite-good alternative:


Two versions: one for visual, one for photography...

The wedges are a bit better, but... be aware of the potential problem of backfocus with the wedges... check your system's focus distances before buying... ;-)

Don't go for glass filters...

Erik.


From: "Craig craig@... [ap-gto]"
To: ap-gto@...
Sent: Wednesday, April 6, 2016 1:35:34 PM
Subject: Re: [ap-gto] solar filters

 


A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success.  The solar load on a quality refractor is no problem so long as the scope has front lens elements only.  You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need. 

Of course you can only use a wedge with a refractor!

-Craig


On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote:

 


Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

 

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 





Re: solar filters

Craig Anderson
 

A Herschel Wedge! Baader or Lunt. I've used them on my AP scopes with great success.  The solar load on a quality refractor is no problem so long as the scope has front lens elements only.  You'll get unbelievable views with your 160 and a wedge. Make sure to get a 2" model and to use additional ND filters for visual. The Baader comes as a kit with everything you need. 

Of course you can only use a wedge with a refractor!

-Craig


On Apr 5, 2016, at 11:41 PM, 'Mike Shade' mshade@q.com [ap-gto] <ap-gto@...> wrote:

 

Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

 

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 


extending Keypad Serial cable CABK9S15

Lee
 

I realize most of the A-P crew is at NEAF but I thought I would try this question here in case they check in.  


Setting up my AP1600GTO-AE. I want to run the serial cable about 25ft from the GTOCP3 keypad connector to the computer.  


Is there a 25ft version of the keypad receptacle cable?


Alternately,  can I connect the 15ft CABSER15 that I am not using on the AE serial port (since I replaced it with a 25ft cable) as an extension of the keypad cable.  Other than the connectors won’t secure to each other without a coupler, is there any problem extending the keypad serial cable with the CABSER15?

 

I will put a coupler in between them to be sure the connection is secure since I am fishing the serial line through a conduit.


Thoughts appreciated. 


Lee



SkyX Pro and Windows 10 and Mach 1

doug789@...
 

Hi,


Newbie here...


I have a Mach 1 running with CP3 and a USB-Serial interface to a Dell with Windows 10. I've got an active com port and can control the mount with SkyX Pro. I am trying to get the Ascom interface working, so I've got .net current, the 6.2 platform installed, the V2X driver installed and just downloaded and installed the Ascom 2X Mount Adapter from Software Bisque.


Problem: I can't find the V2X Mount in the choose dialog, so I still have my non-Ascom interface.


Ideas?


Thanks - Doug


solar filters

Mike Shade
 

Curious as to what solar filters folks have found to be good...I was thinking of a Thousand Oaks glass filter for the 160 EDF...anyone have one for use with this scope...what size fits properly...?

 

Mike J. Shade: mshade@q.com

Mike J. Shade Photography:

mshadephotography.com

 

In War: Resolution

In Defeat: Defiance

In Victory: Magnanimity

In Peace: Goodwill

Sir Winston Churchill

Already, in the gathering dusk, a few of the stars are turning on their lights.

Vega, the brightest one, is now dropping towards the west.  Can it be half

a year since I watched her April rising in the east?  Low in the southwest

Antares blinks a sad farwell to fall...

Leslie Peltier, Starlight Nights

 

International Dark Sky Association: www.darksky.org

 


Using pointing in APCC pointing model app

cluster@...
 

I could not get this to  work so I called.   A lot of app's you put in the unbinned image scale and it uses the bin selected to correct it when plate solve.   this does not do that, you choose the bin and then  have to figure out the image scale.  (easy to do really)


The test button does not work unless you have the settings in plate correct, I guess it is there to verify you entered them correctly.  


I add on the phone call they might want to may that clear on the plate solve settings tab  (you must put in image scale that you have set in the camera settings for bin)


The drop down for the file to test with is FIT   My maxim Dl is saving as FTS, so I pick all files.  I would suggest that you add add options,  FIT;FTS;SBIG  whatever.   Easy to set really since it is using the open dialog in windows I suspect


So will try it again tonight


Re: Strange Slewing Behavior with APCC meridian limits.

Ray Gralak
 

Wayne,

Yes, that can happen under certain circumstances if a move is more than about 1 degree. Apcc was playing it safe by approaching the target in RA only.

-Ray Gralak
Author of APCC (Astro-Physics Command Center): http://www.astro-physics.com/index.htm?products/accessories/software/apcc/apcc
Author of PEMPro: http://www.ccdware.com
Author of Astro-Physics V2 ASCOM Driver: http://www.gralak.com/apdriver
Author of PulseGuide: http://www.pulseguide.com
Author of Sigma: http://www.gralak.com/sigma

-----Original Message-----
From: ap-gto@... [mailto:ap-gto@...]
Sent: Monday, April 4, 2016 6:45 PM
To: ap-gto@...
Subject: [ap-gto] Strange Slewing Behavior with APCC meridian limits.



I've been getting comfortable with using APCC meridian settings, tracking Jupiter with
CW up so as to track it further before being obstructed by my roofline for example.
Last night, I was doing something similar with the Leo triplet. After completing that
session, I wanted to slew to a nearby object, only a degree or two away. The mount
slewed to the west side of the mount as if to point in the normal way, with CW down. I
was about to stop it, But to my surprise, it stopped, slewed back the other direction,
and pointed with counterweights up as I'd expected. Is this an expected behavior?


Strange Slewing Behavior with APCC meridian limits.

Wayne Hixson
 

I've been getting comfortable with using APCC meridian settings, tracking Jupiter with CW up so as to track it further before being obstructed by my roofline for example. Last night, I was doing something similar with the Leo triplet. After completing that session, I wanted to slew to a nearby object, only a degree or two away. The mount slewed to the west side of the mount as if to point in the normal way, with CW down. I was about to stop it, But to my surprise, it stopped, slewed back the other direction, and pointed with counterweights up as I'd expected. Is this an expected behavior?


Re: Polar Alignment/RAPAS

Joel Short
 

The only situation where a great polar alignment is necessary vs. just a good polar alignment is when imaging the same target (or a multi-panel mosaic) over the course of a few months.  An average polar alignment can introduce rotation over a long time.  This was the case for me last winter when I did an 8 panel mosaic of Orion over the course of 4 months. 
joel

On Mon, Apr 4, 2016 at 6:16 PM, binkersnot@... [ap-gto] <ap-gto@...> wrote:
 

That's very good alignment.

In the past I obsessed way too much on getting the most perfect polar alignment possible, wasting way too much valuable time under clear skies.  I've now come to appreciate that, for most of the time, when I dial in Polaris using the RAPAS, the polar alignment is fine for imaging even at a 2000 mm FL with auto-guiding and, as far as I can tell, up to 10 minute subs.

I have not yet tested longer subs, but if I determine drift aligning is necessary, I will add that to my procedure, and here again I will fight the urge to obsess over it.  Probably one iteration would be sufficient to achieve longer subs, if I even need to drift align at all.

Note that there is also a school of thought that auto-guiding with PHD actually works a little bit better when polar alignment is just a little bit off.  I don't know what a little bit is, but I would imagine a couple of arc minutes or maybe even a little more is probably tolerated.  This allows for there to be just a little but of drift to give PHD a slight preference in motion.

This last statement may be controversial, but in my own experience I've found a few arc-minutes of polar misalignment to be tolerable.

Ben