Date   

APPM pointing model using different cameras

Sam Saeed
 

As per Roland a year ago answering one of my questions regarding APPM and camera rotation between sessions:

 

Quoting Roland:

(That is correct. The camera does not do anything as far as mount functions. It's like an eyepiece with a crosshair. You can rotate the crosshair all you want, it has no effect on the mount tracking rates.)

 

 

I just changed my main camera. The model that I currently have using the previous camera is practically close to perfection. I’m curious if I need to redo the model with the new camera as resolution has changed. But based on the above statement, I don’t have too.

 

Please correct me if I’m wrong.

 

 

Thanks

 

Sam Saeed

https://www.decanstars.com


Re: First light for a new camera

Don Anderson
 

Great job Dean! 

Don Anderson


On Wednesday, February 10, 2021, 11:19:50 a.m. MST, Dean Jacobsen <deanjacobsen@...> wrote:


Here is the final iteration:

https://www.astrobin.com/full/0ffdnz/E/

The full res version is viewable by clicking on the button at the upper right corner.  

I really like the amount of detail that can be seen in the Bok globules/dark nebula considering I was using a 4” refractor.
--
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: Factory PEC curve, how is it generated?

skester@...
 

Thank you Roland and Christopher.  Encoder measurement is the obvious choice in hindsight.


Re: Factory PEC curve, how is it generated?

Roland Christen
 

A precision encoder is attached to the RA axis and the resultant PE error is measured using software similar to PEMPro. We do about 5 cycles for each mount (takes about 1/2 hour for that measurement). The curve is calculated and downloaded into the CP and the error is measured again with PEM turned ON. The resultant curve is evaluated and if it's good, the mount goes thru the final testing stages.

Rolando



-----Original Message-----
From: skester@...
To: main@ap-gto.groups.io
Sent: Wed, Feb 10, 2021 12:49 pm
Subject: [ap-gto] Factory PEC curve, how is it generated?

This question is simply to satisfy my curiosity.  To create the factory installed PEC curve I assume each mount must be tested and track a star like source moving at sidereal rate for several worm gear cycles.  Doing this on a real star under the night sky would seem out of the question as it would require many clear nights and much time/effort to do for each mount produced.  That would seem to leave an artificial star that moves at a simulated sidereal rate on a test bench?  Or is there another method I haven't thought of, perhaps using encoders?

Thanks,
Scott
 

--
Roland Christen
Astro-Physics


Re: First light for a new camera

Dean Jacobsen
 

On Wed, Feb 10, 2021 at 10:39 AM, Roland Christen wrote:
Looks good. What is the pixel size binned 2x2?
Yes, this was with the 4.63um 2x2 binned pixel configuration.  Gain 120 and 240s exposures taken from my very light polluted back yard.
 
--
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: Factory PEC curve, how is it generated?

Christopher Erickson
 

My guess is a custom bench top jig with an absolute encoder.

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

On Wed, Feb 10, 2021, 8:49 AM <skester@...> wrote:
This question is simply to satisfy my curiosity.  To create the factory installed PEC curve I assume each mount must be tested and track a star like source moving at sidereal rate for several worm gear cycles.  Doing this on a real star under the night sky would seem out of the question as it would require many clear nights and much time/effort to do for each mount produced.  That would seem to leave an artificial star that moves at a simulated sidereal rate on a test bench?  Or is there another method I haven't thought of, perhaps using encoders?

Thanks,
Scott
 


Factory PEC curve, how is it generated?

skester@...
 

This question is simply to satisfy my curiosity.  To create the factory installed PEC curve I assume each mount must be tested and track a star like source moving at sidereal rate for several worm gear cycles.  Doing this on a real star under the night sky would seem out of the question as it would require many clear nights and much time/effort to do for each mount produced.  That would seem to leave an artificial star that moves at a simulated sidereal rate on a test bench?  Or is there another method I haven't thought of, perhaps using encoders?

Thanks,
Scott
 


Re: First light for a new camera

Bill Long
 

Thats the 4.63um mode (14 bit) on the camera. Bin 1x1 on the camera is 2.3um pixels (but 12 bit). It is kind of like two cameras in one in a way. 

Specs:




From: main@ap-gto.groups.io <main@ap-gto.groups.io> on behalf of Roland Christen via groups.io <chris1011@...>
Sent: Wednesday, February 10, 2021 10:39 AM
To: main@ap-gto.groups.io <main@ap-gto.groups.io>
Subject: Re: [ap-gto] First light for a new camera
 
Looks good. What is the pixel size binned 2x2?

Roland



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Wed, Feb 10, 2021 12:19 pm
Subject: Re: [ap-gto] First light for a new camera

Here is the final iteration:

https://www.astrobin.com/full/0ffdnz/E/

The full res version is viewable by clicking on the button at the upper right corner.  

I really like the amount of detail that can be seen in the Bok globules/dark nebula considering I was using a 4” refractor.
--
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

--
Roland Christen
Astro-Physics


Re: First light for a new camera

Roland Christen
 

Looks good. What is the pixel size binned 2x2?

Roland



-----Original Message-----
From: Dean Jacobsen <deanjacobsen@...>
To: main@ap-gto.groups.io
Sent: Wed, Feb 10, 2021 12:19 pm
Subject: Re: [ap-gto] First light for a new camera

Here is the final iteration:

https://www.astrobin.com/full/0ffdnz/E/

The full res version is viewable by clicking on the button at the upper right corner.  

I really like the amount of detail that can be seen in the Bok globules/dark nebula considering I was using a 4” refractor.
--
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

--
Roland Christen
Astro-Physics


Re: First light for a new camera

Dean Jacobsen
 

My trusty Mach2 kept me right on the mark.
--
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: First light for a new camera

 

wonderful detail!


On Wed, Feb 10, 2021 at 10:19 AM Dean Jacobsen <deanjacobsen@...> wrote:
Here is the final iteration:

https://www.astrobin.com/full/0ffdnz/E/

The full res version is viewable by clicking on the button at the upper right corner.  

I really like the amount of detail that can be seen in the Bok globules/dark nebula considering I was using a 4” refractor.
--
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



--
Brian 



Brian Valente


Re: First light for a new camera

Dean Jacobsen
 

Here is the final iteration:

https://www.astrobin.com/full/0ffdnz/E/

The full res version is viewable by clicking on the button at the upper right corner.  

I really like the amount of detail that can be seen in the Bok globules/dark nebula considering I was using a 4” refractor.
--
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: Counterweight Shaft Case

mdine1us
 

And, don’t forget 2.5 hour drives to a dark site!🥺

//Marty is mobile
Ad Astra

On Feb 9, 2021, at 20:59, Woody Schlom <woody_is@...> wrote:



Brian,

 

Oh yeah, you’re missing out on all the “fun” of portable observing – which includes sore muscles, barked knees and elbows, dust, insect bites, wild animals, dust, cold – and did I mention dust?

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Brian Valente
Sent: Tuesday, February 9, 2021 7:38 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Counterweight Shaft Case

 

with all these great ideas and enthusiasm for transporting the counterweight shaft, now i kind of feel like a sucker for just leaving mine on a pier and not moving it! :)


Re: Counterweight Shaft Case

Woody Schlom
 

Brian,

 

Oh yeah, you’re missing out on all the “fun” of portable observing – which includes sore muscles, barked knees and elbows, dust, insect bites, wild animals, dust, cold – and did I mention dust?

 

Woody

 

From: main@ap-gto.groups.io <main@ap-gto.groups.io> On Behalf Of Brian Valente
Sent: Tuesday, February 9, 2021 7:38 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Counterweight Shaft Case

 

with all these great ideas and enthusiasm for transporting the counterweight shaft, now i kind of feel like a sucker for just leaving mine on a pier and not moving it! :)


Re: Counterweight Shaft Case

dvjbaja
 

People use counterweights? 



Sent via the Samsung Galaxy Note9, an AT&T 5G Evolution capable smartphone


-------- Original message --------
From: Brian Valente <bvalente@...>
Date: 2/9/21 7:38 PM (GMT-08:00)
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Counterweight Shaft Case

with all these great ideas and enthusiasm for transporting the counterweight shaft, now i kind of feel like a sucker for just leaving mine on a pier and not moving it! :)


Re: Counterweight Shaft Case

Barry Megdal
 

I was referring to the idea of putting the shaft end cap onto the mount for storage.


Re: Counterweight Shaft Case

Joe Zeglinski
 

Brian,
 
    Everyone should also check that they have THAT special AP-provided  TEFLON washer/disk, on the threaded end of the shaft. Otherwise, you may find the steel seized  into the mount axis, very difficult to remove, especially in the cold. Don’t lose it.
The Teflon really helps, and now I wouldn’t attach the shaft without it.
 
Joe Z.
 

From: Brian Valente
Sent: Tuesday, February 9, 2021 10:38 PM
To: main@ap-gto.groups.io
Subject: Re: [ap-gto] Counterweight Shaft Case
 
with all these great ideas and enthusiasm for transporting the counterweight shaft, now i kind of feel like a sucker for just leaving mine on a pier and not moving it! :)


Re: Counterweight Shaft Case

 

with all these great ideas and enthusiasm for transporting the counterweight shaft, now i kind of feel like a sucker for just leaving mine on a pier and not moving it! :)


Re: Counterweight Shaft Case

Barry Megdal
 

Great Idea!


Re: Counterweight Shaft Case

Worsel
 

Jeff

Your design looks like it also has a 'homing device'...so, if you leave the shaft and case at a site, it can be returned to you!  Brilliant!

Bryan

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