Date   

Re: 10 inch f6.6 reflector on ap1100?

Roland Christen
 

The 1100 mount would hardly know it was there.

Rolando



-----Original Message-----
From: Robert Chozick via groups.io <rchozick@...>
To: main@ap-gto.groups.io
Sent: Wed, Dec 23, 2020 11:13 am
Subject: Re: [ap-gto] 10 inch f6.6 reflector on ap1100?

What about a 12.75 inch f 4.75 Newtonian on an 1100?  I also need to have it built as it is now a truss mount dob.  It should have a 15 inch tube, about 52 inches long and about 35-40 pounds. The mirror is a thin meniscus that is only about 8 pounds.   Or would a 1200 be better? 

Robert 


On Dec 22, 2020, at 8:47 PM, Roland Christen via groups.io <chris1011@...> wrote:



Would the mount handle it?
The 1100 mount would not even know it was there.
There are many coma correctors available for Newtonians, and you should be able to get good images over a full frame camera field.

Rolando


-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Tue, Dec 22, 2020 8:36 pm
Subject: [ap-gto] 10 inch f6.6 reflector on ap1100?

Hi
I have an 1100 on order and I have an old 10 inch f6.6 reflector with superb optics. I was thinking I might try imaging with it. Would the mount handle it?
At the moment it is a truss tube DOB. I would need to completely redesign the tube. Any suggestions here? Imaging would be with an asi6200 and filter wheel. I do realize I will need to drastically crop the photos but is there anyway to correct for the coma etc?
Thanks

--
Roland Christen
Astro-Physics

--
Roland Christen
Astro-Physics


Re: 10 inch f6.6 reflector on ap1100?

Robert Chozick
 

What about a 12.75 inch f 4.75 Newtonian on an 1100?  I also need to have it built as it is now a truss mount dob.  It should have a 15 inch tube, about 52 inches long and about 35-40 pounds. The mirror is a thin meniscus that is only about 8 pounds.   Or would a 1200 be better? 

Robert 


On Dec 22, 2020, at 8:47 PM, Roland Christen via groups.io <chris1011@...> wrote:



Would the mount handle it?
The 1100 mount would not even know it was there.
There are many coma correctors available for Newtonians, and you should be able to get good images over a full frame camera field.

Rolando


-----Original Message-----
From: Tom Blahovici <tom.va2fsq@...>
To: main@ap-gto.groups.io
Sent: Tue, Dec 22, 2020 8:36 pm
Subject: [ap-gto] 10 inch f6.6 reflector on ap1100?

Hi
I have an 1100 on order and I have an old 10 inch f6.6 reflector with superb optics. I was thinking I might try imaging with it. Would the mount handle it?
At the moment it is a truss tube DOB. I would need to completely redesign the tube. Any suggestions here? Imaging would be with an asi6200 and filter wheel. I do realize I will need to drastically crop the photos but is there anyway to correct for the coma etc?
Thanks

--
Roland Christen
Astro-Physics


Re: leveling the RAPAS on Mach2

Roland Christen
 


But I may be mistaken in this notion as I don't fully understand how the absolute encoders work. Perhaps an azimuth tilt in an otherwise precisely aligned polar axis would affect how the Mach2 perceives its position. Would the ultra precise Home Position then be off?
Yes, the encoders do not have tilt sensors to compensate for an out of level setup. So for a 1 degree tilt E-W you will have a pointing error of 1 degree in RA when referencing any sky object to the absolute home position (this is normal for any mount that has an absolute Home). However, once you center and recal on any sky object, all other objects will be referenced from this recal position, not from the Home position. Therefore in reality the tilt error will be compensated for all subsequent slews to any object on either side of the meridian. That assumes you don't have an orthogonal error in your optical train - but that can also be compensated by using our ortho fix in the keypad, or a quick model in APCC Pro.-

Rolando


-----Original Message-----
From: ernie.mastroianni@...
To: main@ap-gto.groups.io
Sent: Wed, Dec 23, 2020 7:46 am
Subject: Re: [ap-gto] leveling the RAPAS on Mach2

My thinking has been that if the RAPAS is properly calibrated to the Mach2's RA axis, then a non-leveled tripod won't make a difference. Once the polar axis is precisely aligned, it does not care what is going on below. In the past, the difficulty from a non-level mount presents itself when trying to drift align. Adjustments in alt and az are intertwined. You'd really need a level tripod to calibrate the RAPAS, but perhaps once that is done, you should be fine.

But I may be mistaken in this notion as I don't fully understand how the absolute encoders work. Perhaps an azimuth tilt in an otherwise precisely aligned polar axis would affect how the Mach2 perceives its position. Would the ultra precise Home Position then be off?

Ernie

--
Roland Christen
Astro-Physics


Re: leveling the RAPAS on Mach2

Jeffc
 

Fwiw...  I use an AP portable pier which does not have level adjustment.   I’m more concerned with weight imbalance but I also prefer a level pier when imagining.   

So... I level the pier with a plastic bubble level (or iPhone measure app) and some thin hardwood “shims” under one (or two) of legs as needed.  

-jeff 


Re: Version P02-08 now available for GTOCP4 and GTOCP5 control boxes

Roland Christen
 

Serial numbers 89 and later have version P02-08

Rolando



-----Original Message-----
From: weihaowang <whwang@...>
To: main@ap-gto.groups.io
Sent: Tue, Dec 22, 2020 11:16 pm
Subject: Re: [ap-gto] Version P02-08 now available for GTOCP4 and GTOCP5 control boxes

Hi Marj,

Could you tell me how to identify the version of my GTOCP5 so I know if I need the update?
I got the Mach2 two weeks ago, but I am not sure if the update is needed.

Also, when I proceed to the download, the website asked for my username and password.
How do I get these?

Thanks.

Wei-Hao

--
Homepage:

--
Roland Christen
Astro-Physics


Re: leveling the RAPAS on Mach2

W Hilmo
 

To be clear, when I am talking about blinking images, I am not talking about evaluating a single 10 minute exposure.  I am blinking the first exposure of the session with the last.  They are separated by many hours.  I am not seeing field rotation over the entire night, and I am imaging at about 0.5 arc seconds per pixel.

 

I understand and appreciate your interest in the theoretical aspects.  I wanted to comment that they are just that…theoretical.  In actual practice, the RAPAS gives excellent results.

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of weihaowang
Sent: Wednesday, December 23, 2020 7:36 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] leveling the RAPAS on Mach2

 

Hi,

Perhaps as you said, it doesn't matter that much.  But I really want to make things right, and I hope someone can answer me about the squareness between the top surface of the RA motor box and the polar scope.  If this is the case, then an inclinometer in a cell phone can easily solve the problem.

And as Hilmo said, it is exactly the wrong clock angle that concerns me.  Polaris is roughly 0.8 degree from the pole.  An error of 2 degrees (or 8 minutes) in the clock angle (a 2 degree tilt of the tripod) translates to 1.7 arcmin of polar alignment error.  For guided exposure of less than 10 minutes with a guide-star inside the FoV of a few degrees, the 1.7 arcmin of polar alignment is probably OK and will not introduce observable field rotation within the single exposures.  However, the polar alignment error introduced by the tripod tilt is just one of the error budgets.  There can be other polar errors, and all the errors can add up. So I want to do my best to control the error associated with the tripod tilt.

Cheers,
Wei-Hao

--

Homepage:

http://www.asiaa.sinica.edu.tw/~whwang/

Astrobin gallery:
http://www.astrobin.com/users/whwang/


Re: More unguided images with the Mach2 and APCC Pro #APCC #Mach2GTO

Don Anderson
 

I will be waiting till the bugs are worked out and you are satisfied Bill!Emoji

Don Anderson


On Wednesday, December 23, 2020, 08:35:16 a.m. MST, Bill Long <bill@...> wrote:


The QHY version of that 4/3 chip has some firmware issue with it at the moment. I have a ticket open with QHY to hopefully aid in getting it resolved. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Dean Jacobsen <deanjacobsen@...>
Sent: Tuesday, December 22, 2020 10:08 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] More unguided images with the Mach2 and APCC Pro #Mach2GTO #APCC
 
Yes, there is a mono version of the Sony IMX571 APS-C detector on the way.  I read on CN today that QHY is trying to get theirs out by mid January.  Both ZWO and QHY introduced a new 4/3” sensor mono camera with a Sony IMX492 sensor a couple of months ago.  
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Re: More unguided images with the Mach2 and APCC Pro #APCC #Mach2GTO

Don Anderson
 

Thanks for the info.

Don Anderson


On Tuesday, December 22, 2020, 11:08:15 p.m. MST, Dean Jacobsen <deanjacobsen@...> wrote:


Yes, there is a mono version of the Sony IMX571 APS-C detector on the way.  I read on CN today that QHY is trying to get theirs out by mid January.  Both ZWO and QHY introduced a new 4/3” sensor mono camera with a Sony IMX492 sensor a couple of months ago.  
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Re: leveling the RAPAS on Mach2

weihaowang
 

Hi,

Perhaps as you said, it doesn't matter that much.  But I really want to make things right, and I hope someone can answer me about the squareness between the top surface of the RA motor box and the polar scope.  If this is the case, then an inclinometer in a cell phone can easily solve the problem.

And as Hilmo said, it is exactly the wrong clock angle that concerns me.  Polaris is roughly 0.8 degree from the pole.  An error of 2 degrees (or 8 minutes) in the clock angle (a 2 degree tilt of the tripod) translates to 1.7 arcmin of polar alignment error.  For guided exposure of less than 10 minutes with a guide-star inside the FoV of a few degrees, the 1.7 arcmin of polar alignment is probably OK and will not introduce observable field rotation within the single exposures.  However, the polar alignment error introduced by the tripod tilt is just one of the error budgets.  There can be other polar errors, and all the errors can add up. So I want to do my best to control the error associated with the tripod tilt.

Cheers,
Wei-Hao

--

Homepage:

http://www.asiaa.sinica.edu.tw/~whwang/

Astrobin gallery:
http://www.astrobin.com/users/whwang/


Re: More unguided images with the Mach2 and APCC Pro #APCC #Mach2GTO

Bill Long
 

The QHY version of that 4/3 chip has some firmware issue with it at the moment. I have a ticket open with QHY to hopefully aid in getting it resolved. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Dean Jacobsen <deanjacobsen@...>
Sent: Tuesday, December 22, 2020 10:08 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] More unguided images with the Mach2 and APCC Pro #Mach2GTO #APCC
 
Yes, there is a mono version of the Sony IMX571 APS-C detector on the way.  I read on CN today that QHY is trying to get theirs out by mid January.  Both ZWO and QHY introduced a new 4/3” sensor mono camera with a Sony IMX492 sensor a couple of months ago.  
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Re: Meridian Flip Feature Yet?

Bill Long
 




From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of ray.palmer@... <ray.palmer@...>
Sent: Tuesday, December 22, 2020 9:57 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: [ap-gto] Meridian Flip Feature Yet?
 
Hi Group,

I am using a 1600GTO. Just wondering if any of the latest software updates have included a Meridian Flip feature yet please (I haven't updated the firmware for about two years)? AP make elite mounts there is no question, but many other brands have had this feature for many years, it is industry standard, where you basically press one button and she flips. I'm not looking for a timely work around solution, such as trying to reset the meridian to trick the mount into flipping (that is clunky, time consuming and not user friendly if you require to do it a few times per night). I am looking for instantaneous functionality like many other brand mounts have built into them. I have to flip numerous times through the night and it is not because of the meridian (dome slit angle, power pole, observatory door, etc). Otherwise is there any software that can flip an AP mount please? Thanks in advance and have a great Xmas. 
--
Raymond D Palmer
Astronomer
Western Australia
www.MyAstroSpace.com
www.TheCosmicArtGallery.com


Re: Version P02-08 now available for GTOCP4 and GTOCP5 control boxes

Bill Long
 

When you connect to APCC you can look at the top of the window and see the firmware version on the right side.



From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of weihaowang <whwang@...>
Sent: Tuesday, December 22, 2020 9:16 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Version P02-08 now available for GTOCP4 and GTOCP5 control boxes
 
Hi Marj,

Could you tell me how to identify the version of my GTOCP5 so I know if I need the update?
I got the Mach2 two weeks ago, but I am not sure if the update is needed.

Also, when I proceed to the download, the website asked for my username and password.
How do I get these?

Thanks.

Wei-Hao

--

Homepage:

http://www.asiaa.sinica.edu.tw/~whwang/

Astrobin gallery:
http://www.astrobin.com/users/whwang/


Re: More unguided images with the Mach2 and APCC Pro #APCC #Mach2GTO

Bill Long
 

That is slated to appear in mid Jan 2021. 


From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Don Anderson via groups.io <jockey_ca@...>
Sent: Tuesday, December 22, 2020 9:08 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] More unguided images with the Mach2 and APCC Pro #Mach2GTO #APCC
 
Nice to see such good images being taken with CMOS cameras. They are getting better all the time. Now the mainstream guys not just the Chinese manufactures are starting to produce them. I am pretty much confined to narrowband being in a large light polluted (Bortle 8-9) city. My icx694 based mono camera works well with narrowband. Love the sensitivity of this Sony chip. Would like to get into something with a larger format possibly and imx455 based camera to get a wider field of view using my TV NP127is scope. However that would mean new FW and 2" filters plus the camera. Hard to justify right now. I wonder if Sony will come out with a mono APS C format CMOS sensor.

Don Anderson


On Tuesday, December 22, 2020, 09:16:45 p.m. MST, Dean Jacobsen <deanjacobsen@...> wrote:


On Tue, Dec 22, 2020 at 06:21 PM, Don Anderson wrote:
How do you feel the OSC camera images compare to those of Mono cameras with filters?
I like this particular camera Don.  I have been enjoying using it.  I'll still be using mono cameras for things like narrowband but I think that the color camera works great for star fields and brighter objects.
 
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Re: Meridian Flip Feature Yet?

Bill Long
 

For some reason, my posts never go through this late at night. See the circled bit in this image below. Flip Mount button in APCC. Pro not required.


Re: Precise polar alignment of the azimuth axis

Steven Panish
 

Look into ConeSharp.  Works REALLY well to eliminate cone error.  From the SharpCap folks.

Steve

On Tue, Dec 22, 2020 at 5:44 PM John <obee11@...> wrote:
Aloha All,

  I will review all of this, thanks! 

  Somehow I missed the info on page 26 of the pdf file.  That pdf file is for keypad ver 4.19.3 and I was looking in the newer Keypad manual ver 5.x.x.x (dated 11 Nov 2020).
The newer manual is a little different.  No worries!!

  I'm using the Sharpcap polar align tool which is probably similar to the others (ie take an image and rotate the ra axis 90 degrees, take another image, and then adjust the mount to the ncp).
I can do this thru either the guide scope camera on the main C8 camera. But I'm a little worried that I might be introducing some small ortho or cone errors. I guess a Polemaster camera mounted
on front of the Mach 2 would take care of that!  And the modeling will help to (just haven't got to it yet)

    John

 


Re: leveling the RAPAS on Mach2

W Hilmo
 

In terms of making the adjustments to polar align the mount, being level matters very little.  The only effect is that an adjustment to one axis might slightly affect the other, but as long as you put Polaris in the right spot, you are correctly polar aligned.

 

The possible issue with being unlevel in east/west, is that the clock angle of the reticule might be slightly off.  My thought off the top of my head, is that you would need to be very unlevel for this to make a meaningful difference.  In thinking it through, I think that the actual effect of this is latitude dependent.  For example, if you are at the equator, if your mount is tilted two degrees towards the west, the reticule would also be rotated two degrees west.  But if you are at the pole, the reticule would be at the correct clock angle, no matter how much the mount is tilted.  You could use some trigonometry to calculate this for other latitudes.

 

In practice, I maintain that this is simply not an issue.  I tend to image between 40 and 48 degrees north, depending on which site I’m using.  When I set up the mount, I do use a carpenter’s level to level the pier before I put the mount on it.  My polar alignment routine is to do the daytime polar alignment when I set up the mount, and then use the RAPAS to touch up the polar alignment at dusk.  The purpose of the daytime polar alignment is to get close enough that Polaris is unmistakable in the RAPAS reticule.  It also gives me a chance to sanity check my compass work that I have sufficient azimuth adjustment to complete the polar alignment (if I have to turn the entire setup a few degrees, I would rather do it during the day).  If you add up the total time that I spend on polar alignment, including both the daytime work and using the RAPAS, it’s probably around two to three minutes.

 

When I first got the RAPAS, I did a drift alignment and adjusted the RAPAS accordingly.  It was already very close, so it was a tiny adjustment.  In terms of performance, I always image from dusk to dawn.  As a normal part of my processing, I always blink through my stack of sub exposures.  In doing this, any field rotation through the night would be pretty obvious.  With the above routine, I never see any rotation, even if I blink the first and last exposures against each other.  I don’t know of a better validation of the polar alignment.

 

That’s why I say that the RAPAS works fine and is easily sufficient for any imaging that you want to do.  Don’t worry about it.

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of ernie.mastroianni@...
Sent: Wednesday, December 23, 2020 5:46 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] leveling the RAPAS on Mach2

 

My thinking has been that if the RAPAS is properly calibrated to the Mach2's RA axis, then a non-leveled tripod won't make a difference. Once the polar axis is precisely aligned, it does not care what is going on below. In the past, the difficulty from a non-level mount presents itself when trying to drift align. Adjustments in alt and az are intertwined. You'd really need a level tripod to calibrate the RAPAS, but perhaps once that is done, you should be fine.

But I may be mistaken in this notion as I don't fully understand how the absolute encoders work. Perhaps an azimuth tilt in an otherwise precisely aligned polar axis would affect how the Mach2 perceives its position. Would the ultra precise Home Position then be off?

Ernie


Re: leveling the RAPAS on Mach2

ernie.mastroianni@...
 

My thinking has been that if the RAPAS is properly calibrated to the Mach2's RA axis, then a non-leveled tripod won't make a difference. Once the polar axis is precisely aligned, it does not care what is going on below. In the past, the difficulty from a non-level mount presents itself when trying to drift align. Adjustments in alt and az are intertwined. You'd really need a level tripod to calibrate the RAPAS, but perhaps once that is done, you should be fine.

But I may be mistaken in this notion as I don't fully understand how the absolute encoders work. Perhaps an azimuth tilt in an otherwise precisely aligned polar axis would affect how the Mach2 perceives its position. Would the ultra precise Home Position then be off?

Ernie


Re: Initial GoTo In APCC Pro Cause Nose or Tail Dive

Dominique
 

Hi John,
When I received my keypad, I had the same type of problem. Solved by setting the keypad to EXT, which I think gives priority to APCC, but normally if the site initializes on the keypad and APCC there shouldn't be a problem. I did not find any information in the manuals indicating incompatibilities.
Dominique


Re: More unguided images with the Mach2 and APCC Pro #APCC #Mach2GTO

Dean Jacobsen
 

Yes, there is a mono version of the Sony IMX571 APS-C detector on the way.  I read on CN today that QHY is trying to get theirs out by mid January.  Both ZWO and QHY introduced a new 4/3” sensor mono camera with a Sony IMX492 sensor a couple of months ago.  
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/ 
Amateur Radio Call Sign - W6DBJ


Meridian Flip Feature Yet?

ray.palmer@...
 

Hi Group,

I am using a 1600GTO. Just wondering if any of the latest software updates have included a Meridian Flip feature yet please (I haven't updated the firmware for about two years)? AP make elite mounts there is no question, but many other brands have had this feature for many years, it is industry standard, where you basically press one button and she flips. I'm not looking for a timely work around solution, such as trying to reset the meridian to trick the mount into flipping (that is clunky, time consuming and not user friendly if you require to do it a few times per night). I am looking for instantaneous functionality like many other brand mounts have built into them. I have to flip numerous times through the night and it is not because of the meridian (dome slit angle, power pole, observatory door, etc). Otherwise is there any software that can flip an AP mount please? Thanks in advance and have a great Xmas. 
--
Raymond D Palmer
Astronomer
Western Australia
www.MyAstroSpace.com
www.TheCosmicArtGallery.com

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