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Clement Focuser on Hale 200 inch Telescope

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#26 SGT500

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Posted 25 June 2013 - 08:46 PM

Ram, The data was plentiful even with 60s subs! I suspect anything more would have blown out the core.
As for processing, i started out in Pixinsight by doing Deconvolution, Histogram transformations, HDRMultiscale, and LHE. Then transferred into photoshop for final contrast adjustments, and some layer masking. Processing was actually really easy because the data was so excellent.
I can't answer your question on flats, I dont know. sorry.

#27 orlyandico

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Posted 27 June 2013 - 01:11 AM

so any f3.3 scope with those skies should get that type of exposure at 60s?

(i know the detail won't be there due to the much smaller focal length)

#28 SGT500

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Posted 27 June 2013 - 07:49 AM

I don't think so. I assume that the light gathering ability of the 200" played a huge role in the luminosity of the image.

#29 Astrojensen

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Posted 27 June 2013 - 06:38 PM

f/3.3 is f/3.3, regardless of the aperture. The level of illumination per pixel on a CCD is identical. But the bigger the scope, the bigger the image scale.


Clear skies!
Thomas, Denmark

#30 JoseBorrero

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Posted 27 June 2013 - 07:29 PM

surface area of the imaging train change, focal ratio is a ratio. for ex. 1:2 ratio, for every 1 you will get 2 :D

#31 NickK-UK

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Posted 28 June 2013 - 04:28 AM

Very nice - image is showing zero tilt as you'd expect!

#32 don clement

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Posted 09 July 2013 - 02:20 PM

"An echo of a distant time
Comes willowing across the sand"

~Pink Floyd

#33 Tom McDonald

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Posted 14 July 2013 - 04:10 PM

I'm in awe............ :bow:

#34 Tom McDonald

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Posted 14 July 2013 - 04:12 PM

And your taste in music is impeccable!

#35 Jeff Phinney

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Posted 27 August 2013 - 02:04 PM

Hi Don,

Do you know what project this was for? .....

Chuck


I'm kinda curious myself self since the Large Format Camera(LFC) has been in operation on the 200" for almost 13 years, covering a third of a degree at PF. What was the goal of this exercise?

#36 jgraham

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Posted 27 August 2013 - 10:13 PM

Now that's too cool for scool! Amazing!

#37 don clement

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Posted 27 August 2013 - 10:40 PM

Hi Don,

Do you know what project this was for? .....

Chuck


I'm kinda curious myself self since the Large Format Camera(LFC) has been in operation on the 200" for almost 13 years, covering a third of a degree at PF. What was the goal of this exercise?


My understanding was that the existing camera was focused only manually and this was an engineering exercise to test the feasibility of autofocus. Steve Brady of Focusmax http://www.focusmax.org/ came out last May for the test.

Don

#38 PaulGardner

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Posted 16 September 2013 - 05:27 PM

The camera was an Apogee U16M. The subframes for the shot were under 20 seconds. Total integrated exposure was roughly 20 minutes for the luminance channel.

The project was to determine the exact distance from the prime focus pedestal to the focal point of the telescope with and without the wynn corrector.

I was using CCDAP to do some image quality assessment and did run into some limitations with inputting focal length. I actually don't recall what I did to get around that.

#39 PaulGardner

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Posted 16 September 2013 - 05:30 PM

For flats we have several different lamps in the prime focus cage the illuminate a large section of the dome that is painted white. Basic dome flats.

#40 PaulGardner

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Posted 16 September 2013 - 05:41 PM

Also seeing that night was a crisp 0.86 arcs.

Big Thanks to Don for lending me the focuser (I am actually buying one for permanent use when I do engineering), Sal for processing my images and Steve Brady for coming out and working magic with his software to autofocus the 200" in 90 seconds flat.

#41 PGW Steve

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Posted 16 September 2013 - 09:48 PM

Steve Brady for coming out and working magic with his software to autofocus the 200" in 90 seconds flat.



Incredible!! Thank you for sharing!

#42 Jim Curry

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Posted 16 November 2013 - 07:54 AM

What a story. What a project. Congratulations Don, Paul and the rest of the team!






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