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Clement Focuser on Hale 200 inch Telescope

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#1 don clement

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Posted 12 June 2013 - 03:35 PM

Last month a Clement focuser (3" Bellerophon III model with RoboFocus motor and controller) was used with FocusMax software to successfully autofocus and image using an Apogee D7 camera at prime focus F/3.3 on the Palomar Hale 200 inch telescope. The focuser was mounted just above the Wynne corrector and there was very little back focus available, also travel of 25mm was required. The ultra-low profile [1"] and long travel [1.25"] of the Clement Focuser met these stringent requirements. An ultralow adapter allowed the Apogee D7 camera to be mounted flush with the Clement Focuser top plate. Shown below is the Clement Focuser in the 200" prime focus cage.

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#2 don clement

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Posted 12 June 2013 - 03:37 PM

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#3 don clement

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Posted 12 June 2013 - 03:45 PM

M51 taken with Apogee A7 camera on Clement Focuser at prime focus F/3.3 Hale 200inch Telescope

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#4 Billydee

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Posted 12 June 2013 - 04:09 PM

Don,

Must be nice to have a 200 inch scope. I guess size does matter !

Very nice, Bill

#5 don clement

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Posted 12 June 2013 - 04:25 PM

Must be nice to have a 200 inch scope. I guess size does matter !


George Ellery Hale also thought size mattered.

#6 Mike B

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Posted 12 June 2013 - 06:36 PM

Gorgeous shot! :bow:

I saw that from my backyard. Well, uhh, i "saw" it... didn't look remotely LIKE that. :foreheadslap:

Inquiring mimes wanna know- what was the exposure time on that shot? How 'bout max FoV capture?
:scratchhead:

#7 frolinmod

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Posted 12 June 2013 - 06:52 PM

Don, you've hit the big time. Big telescope that is.

#8 don clement

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Posted 12 June 2013 - 07:04 PM

Nobody else's focuser could meet the requirements of one inch profile with inch and quarter focuser travel and no part of the focuser protruding below the base that would contact the Wynne corrector.

Don Clement

#9 Pinbout

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Posted 12 June 2013 - 07:06 PM

Congrats on such a high profile job.

#10 Jon Isaacs

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Posted 13 June 2013 - 05:14 AM

Nobody else's focuser could meet the requirements of one inch profile with inch and quarter focuser travel and no part of the focuser protruding below the base that would contact the Wynne corrector.

Don Clement


Don:

That is totally awesome...

Jon

#11 Raginar

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Posted 13 June 2013 - 12:44 PM

That's awesome Don! Congrat's!

#12 mattflastro

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Posted 13 June 2013 - 01:45 PM

Nobody else's focuser could meet the requirements of one inch profile with inch and quarter focuser travel and no part of the focuser protruding below the base that would contact the Wynne corrector.

Don Clement


That scope looks huge and it's "only" a 5m . Did you assist with the installation ?

#13 RAKing

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Posted 14 June 2013 - 06:33 AM

Needless to say - WOW! :bow: :bow:

Congrats on a great installation and a remarkable image.

Ron

#14 herrointment

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Posted 16 June 2013 - 11:28 AM

That's one enormous feather for your hat.

Congratulations!

#15 rainycityastro

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Posted 20 June 2013 - 11:49 PM

Don, that's one phenomenal image with a very impressive focuser (I have one) I'd love to know how long that image was. Wont be surprised at all if the integration times weren't that long.

I met the gentleman in the picture at AIC 2012. He works at Palomar and is an accomplished imager.

Regards,
--Ram

#16 orlyandico

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Posted 21 June 2013 - 02:20 AM

that image is probably a few minutes. what i've seen from the literature is that most professional observations with ground-based telescopes (which are almost all spectroscopic) are with short (<10 minute) exposures. they're going for a huge number of observations, so they need to keep them short.

#17 ScottAz

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Posted 22 June 2013 - 08:30 PM

That is totaly cool! :bow:

#18 faackanders2

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Posted 22 June 2013 - 09:52 PM

M51 taken with Apogee A7 camera on Clement Focuser at prime focus F/3.3 Hale 200inch Telescope

Posted Image


WOW! Is this more detailed than Hubble?

#19 don clement

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Posted 23 June 2013 - 12:57 PM

Exposure time is mostly dependent on F ratio, not the size of the scope. The Hale 200" at prime focus is a fast F/3.3. See Dave Erickson's http://hbastro.com/F...ideratoins.pdf. The amazing thing about the M51 image to me is that it was taken during the Full moon.

BTW Dave Erickson has four of my focusers including his 8" F/2.6 astrograph that is focused by moving a 10" asphere mirror using a Clement center drive focuser.

Don Clement

#20 Chucke

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Posted 24 June 2013 - 03:34 PM

Hi Don,

Do you know what project this was for? I am curious because I recently read they were using CCDAutoPilot with the 200" and having some difficulty specifying a long enough focal length.

Chuck

#21 don clement

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Posted 24 June 2013 - 07:10 PM

Chuck,

I don't about CCDAutoPilot being used during this project. I do know that FocusMax http://www.focusmax.org/ software was used to autofocus the 200" at prime focus F/3.3 with my focuser and was told that this was a "HUGE success".

Don Clement

#22 Dave O

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Posted 25 June 2013 - 01:41 AM

Wonderful Don! You've certainly earned some bragging rights with this one! Well done! :)

#23 SGT500

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Posted 25 June 2013 - 08:34 AM

To all asking about exposure time, this one was 20 minutes of exposure in 60s subs.

#24 rainycityastro

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Posted 25 June 2013 - 01:14 PM

Wow, I'd never have guessed 60s subs at F 3.3 was sufficient!

Sal, do you know how flats were done with that giant scope? Any other information on how the image was processed?
Any unique challenges with processing that image?

#25 Ira

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Posted 25 June 2013 - 07:49 PM

This is just the coolest thing ever, and on such a legendary scope. Hope you'll write an article about it.

/Ira






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