Date   

155 image from down under

Roland Christen
 

Hello all,

Just wanted to pass on an image from Peter Ward in Australia, doing imaging with his venerable 155EDF:
Rolando

"I was wanting to pass on some impressions of the new Quad TCC for my venerable AP155.
What a superb accessory! 
The image below was taken in just one evening.
 
 
Suffice to say, the stars are perfectly formed, right to the edge of field and given a full-frame 60Mp CMOS imager was used  (which takes no prisoners when it comes to less than perfect stellar profiles) the result is simply stunning.

Well done!
 
Regards
 
Peter Ward
General Manager
Advanced Telescope Supplies
37 Thomas Mitchell Drive
Barden Ridge NSW 2234
Australia
 

--
Roland Christen
Astro-Physics


Re: 400GTO

Howard Hedlund
 

Hi Chris,
George asked me to assist you.  We'll get your CP3 personality changed.  I'll respond privately.
HKH


Re: APCC Virtual Ports intermittenly not working

Howard Hedlund
 

Hi Rory,
I would pull a *ditch and switch.*  Ditch the virtual ports and switch to using the ReST API to connect the driver to APCC
Set up APCC for the ReST API in the API tab of the Advanced Settings window.  You will need to restart APCC.
Set up the ReST API in the driver.
Done.  Call me if you have further questions.
HKH


APCC Virtual Ports intermittenly not working

Rory Clarke
 

I am running APCC from Windows 10 from a USB connection on an AP Mach 1 using a G4 controller. My issue is my virtual comm ports don't work most of the time, but every once in awhile after testing various comm ports it will work for a session, but when I restart my computer it will not work anymore. I am always trying comm ports greater than 21, but I Have used lower number ports as well (in this picture below I tried 5 and 6). I have spent several nights (3 or 4 entire nights) attempting to trouble shoot this. I have click all the buttons (create virtual ports first, auto connect, auto-config, auto start) in every combination possible and have reset my computer countless times. Like I said, every once in a while I'll get lucky and the comm port will recognize, but it is not repeatable. When it works, it's great. 


Re: 400GTO

Chris White
 

Thanks for the tip Bill.  I've been using a 900GTO, which I think has the same potential danger with the clutch knobs.  But it is good to know, so thanks for bringing this up. 

Glad to hear you like this little mount! 


Re: 400GTO

WMarton@...
 

You have an identical configuration to mine (upgraded CP3 with V2 chip).  It is a terrific little mount.  My only advice: be careful and do not overtighten the clutches.  Unlike the Mach1 and later mounts, the clutch knobs have delrin tips that can deform if you apply too much pressure.  The original manual came with an insert reiterating this fact; you may not have access to it secondhand.  Also, I would mark the 90 degree RA and DEC axes using painter's tape so putting the mount in the various park positions is easier.

Bill


Re: Speaking of Paladin - Have Scope...

thefamily90 Phillips
 

👍

From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Chris White <chris.white@...>
Sent: Saturday, June 4, 2022 8:14:07 PM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] Speaking of Paladin - Have Scope...
 
He looks like he knows how to use it too!


Re: [ap-ug] Speaking of Paladin - Have Scope...

Pete Lardizabal
 

I just noticed the dew shield has a taper near the proximal end… 🧐

Sharp looking scope. 👍🏻

Pete


On Jun 4, 2022, at 8:05 PM, Roland Christen via groups.io <chris1011@...> wrote:

We have our own Paladin, Robert our chief design engineer with the baby GTX:

Have Scope
Will Travel
<dummyfile.0.part>



Re: Mac version of APCC

Marcelo Figueroa
 

Yes, it requires windows. And virtually all capture software options (SGP, NINA, Voyager, etc) as well. 
 
Your best option as a Mac user is to get a cheap laptop pc or a NUC for capture and then control it remotely from the Mac. And fortunately most of the processing software is available Mac. That's what I do.


Re: Speaking of Paladin - Have Scope...

Chris White
 

He looks like he knows how to use it too!


Speaking of Paladin - Have Scope...

Roland Christen
 

We have our own Paladin, Robert our chief design engineer with the baby GTX:

Have Scope
Will Travel


--
Roland Christen
Astro-Physics


Re: Mac version of APCC

 

Yes, it requires Windows.

Clear Skies,
Marj Christen
Astro-Physics
11250 Forest Hills Road
Machesney Park, IL 61115
Phone: 815-282-1513
www.astro-physics.com
Video Tutorials: https://www.youtube.com/astrophysicscorp

-----Original Message-----
From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Howard Ritter via groups.io
Sent: Saturday, June 4, 2022 6:47 PM
To: main@ap-gto.groups.io
Subject: [ap-gto] Mac version of APCC

Am I correct that APCC requires Windows?

—howard


Mac version of APCC

Howard Ritter
 

Am I correct that APCC requires Windows?

—howard


400GTO

Chris White
 

Well, since the big announcement wasnt a newly designed 400GTO... I decided to try and find an old one!

It's on its way and will arrive early next week. I also picked up a CP3v2 so I can use APPC with it.  I understand I need to change the "personality" and I've reached out to George to get this process started. 

I'm really excited to receive this mount, it will pair so nicely with my Stowaway.  Almost as excited as the Mach2 that comes later this month!

Any tips or tricks or reminiscences about this sweet little mount?


Re: Field Rotation

M Hambrick
 

Hi Brian

I am not sure what to think. As near as I can tell, the total drift that I measured over the 5 hour continuously guided session was constant. If I assume this to be the case, then I think I am correct to conclude there was also drift occurring while I was taking my images which could result in elongated stars.

I measured 7.91" drift in RA and 25.5" in Declination over the 5 hours (304 minutes) of imaging. This calculates to an average drift rate of 0.026" per minute in RA and 0.084" per minute in Declination. For a 10-minute image this would be a drift of 0.026" in RA and 0.83" in Dec. Keep in mind that this RA drift rate is in seconds of RA. To convert to seconds of degrees you have to multiply this number by 15.

Is my system sensitive enough for this to show up as elongated stars ? I don't know. Many of my images contain very slightly elongated stars across the image. Is this due to drift ? The image scale with my scope / camera combination is 1.04" per pixel. On this particular night, the best focus I was able to get was a FWHM between 2" and 2.5".

Mike


Re: Field Rotation

Ray Gralak
 

Hi Roland,

 

I get what you are saying, but your demonstration is not like the user’s setup.

 

For instance, the original poster used two telescopes. To approximate the poster’s setup, you would have to create a Dec Arc model with data points identified with a guide scope, then capture images on a different, larger main scope.

 

Also,  completely unrelated, but SkyX accounts for refraction, so unless refraction is broken in SkyX, there must be another reason for the positional discrepancy in your example:

 

 

 

-Ray

 

 

From: main@ap-gto.groups.io [mailto:main@ap-gto.groups.io] On Behalf Of Roland Christen via groups.io
Sent: Friday, June 3, 2022 11:50 AM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Field Rotation

 

 

Below shows a short session where I used a simple Keypad Dec arc model to keep the star (Arcturus) on the crosshairs of my imaging camera. The keypad reads out the RA and Dec trim rate that is applied in the CP5 control in order to follow the star's motion over time. At the beginning of the run, at 7:52pm, the star was shown on the crosshair of the camera (right blue crosshair in MaximDL), while at the same time SkyX recorded the cursor position to be exactly aligned with the star. The trim rate being applied in RA was 61 arc sec per hour - this being the drift rate of the star at that 50 degree altitude, due mostly to atmospheric refraction and some slight polar alignment error.

 

After approximately an hour, the star is still on the blue crosshairs (mount's tracking was being adjusted continuously by the model). Pixel scale of this setup was 1.1 arc sec per pixel. You can see in the second image below that the actual reported position has moved by approximately 61 arc seconds in RA with respect to the planetarium position. If the mount had continued tracking this star for 4 or more hours into the West, the actual reported position would probably have been several hundred arc seconds. There is no field rotation involved, just simple and pure atmospheric refraction that causes a star to not be in the theoretical RA/Dec position that a planetarium program shows. Doing a Recal at any time will of course bring both the star and the cursor back together.

 

 

 


--
Roland Christen
Astro-Physics


Re: Field Rotation

Roland Christen
 

I usually let it drift 10 minutes for each point, then center the star and press Enter.
Focal length was 870mm, pixel size 3.76 microns, plate scale 0.89 arc sec/pixel.
Seeing was average, later on deteriorated somewhat.

Roland

-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Fri, Jun 3, 2022 5:27 pm
Subject: Re: [ap-gto] Field Rotation

On Fri, Jun 3, 2022 at 02:48 PM, Roland Christen wrote:
Actually it was 4 points, not 3, and approximately 45 - 50 minutes between each point using convenient stars near or on the 20 degree Dec line. The model was run near sunset time, before any imaging cold be done.
 
I forgot to ask...

1.  For this example, do you remember how long you let it drift?

2.  What was the focal length for this example?
 
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/

--
Roland Christen
Astro-Physics


Re: Field Rotation

Dean Jacobsen
 

On Fri, Jun 3, 2022 at 02:48 PM, Roland Christen wrote:
Actually it was 4 points, not 3, and approximately 45 - 50 minutes between each point using convenient stars near or on the 20 degree Dec line. The model was run near sunset time, before any imaging cold be done.
 
I forgot to ask...

1.  For this example, do you remember how long you let it drift?

2.  What was the focal length for this example?
 
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/


Re: Field Rotation

Dean Jacobsen
 

On Fri, Jun 3, 2022 at 02:48 PM, Roland Christen wrote:
Actually it was 4 points, not 3, and approximately 45 - 50 minutes between each point using convenient stars near or on the 20 degree Dec line. The model was run near sunset time, before any imaging cold be done.
 
Thanks for the clarification. 

After two years of using APCC and APPM to do unguided imaging I actually bought a keypad for my Mach2 last month so that I can try out that feature.  :-)
 
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/


Re: Field Rotation

Roland Christen
 

Actually it was 4 points, not 3, and approximately 45 - 50 minutes between each point using convenient stars near or on the 20 degree Dec line. The model was run near sunset time, before any imaging cold be done.

Rolando

-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Fri, Jun 3, 2022 2:19 pm
Subject: Re: [ap-gto] Field Rotation

On Fri, Jun 3, 2022 at 11:50 AM, Roland Christen wrote:
Below shows a short session where I used a simple Keypad Dec arc model to keep the star (Arcturus) on the crosshairs of my imaging camera.
Awesome, thanks for this example.

Your note says it was a 3 point model.  Was this an hour separation between sample points?
 
--
Dean Jacobsen
Astrobin Image Gallery - https://www.astrobin.com/users/deanjacobsen/

--
Roland Christen
Astro-Physics

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