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  #1  
Old 18-09-2010, 09:57 PM
Hagar (Doug)
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Field Flattener Help Needed

I have just purchased a 10" GSO RC and need a field flattener for this scope to use in conjunction with my 11002 CCD.
With the 8" I could get away with using the Tak 35 flattener and a smaller CCD of course.
The full frame CCD will no doubt cause some vignetting around the image when using the 35 flattener at a 150mm separation from the CCD.

I don't know of any FF that is any bigger or can be used in conjunction with the Feathertouch 3" focuser.
Even something which is 2" but requires much less distance to the CCD.

Please scour the net and help me.

I can't find anything.
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  #2  
Old 18-09-2010, 10:27 PM
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Just taking a shot in the dark here Doug but have you seen these. I know they are for a refractor but

http://apmamerica.com/index.php?main...products_id=86

Mark
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  #3  
Old 18-09-2010, 10:33 PM
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DavidU (Dave)
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Doug, these are touted to do a good job in the 10"Rc's
http://www.gs-telescope.com/content.asp?id=125
Andrews sells them now and also advertises that they are good for the 10"RC.
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  #4  
Old 18-09-2010, 10:53 PM
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Tandum (Robin)
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Opt lists this 2.7" reducer as an accessory for the tak frc300 RC scope ?

And I've read about an OGS flattener used on RC scopes but it could possibly cost more than your scope

Last edited by Tandum; 18-09-2010 at 11:07 PM.
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  #5  
Old 19-09-2010, 09:21 AM
Hagar (Doug)
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Thanks everyone for the array of correctors. I have taken the punt on the APM version and some adapters and will let you know how I get on.
Many Thanks
Doug
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  #6  
Old 19-09-2010, 11:27 AM
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Moon (James)
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Doug
I took this one with the 8" RC and the TSRCFlat2 and STL11k
http://deepspaceplace.com/show.php?id=ngc3293b

James
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  #7  
Old 19-09-2010, 12:00 PM
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That flattener James suggested looks like a better option as it is purpose built for the RC 8 and 10 and supports up 45mm image circle. Only 109mm BF needed and Same mob make them (TS). Teleskop shop is good to deal with as well but you will have to email them and they will give you their paypal account details.

Mark

Last edited by marki; 19-09-2010 at 02:48 PM.
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  #8  
Old 19-09-2010, 12:19 PM
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Quote:
Originally Posted by Moon View Post
Doug
I took this one with the 8" RC and the TSRCFlat2 and STL11k
http://deepspaceplace.com/show.php?id=ngc3293b

James
A very nice image James. I may be wrong but I still notice a considerable amount of distortion that looks like field curvature to me from about 50% out to the corners. Do you think its curvature or something else?

I'm also looking for a good flattener for an RC8 (I don't mind if its a reducer too though)

Dave.
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  #9  
Old 19-09-2010, 02:21 PM
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Dave
My image by no means perfect and with such a large chip it's quite difficult to get good collimation. I also believe you will always need to crop the extreme corners with the flattener. Having said that, the image scale works in your favour, making all the stars look smaller.
If you are using a smaller chip, then the task would be much easier.
James
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  #10  
Old 19-09-2010, 07:50 PM
Hagar (Doug)
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Quote:
Originally Posted by Moon View Post
Doug
I took this one with the 8" RC and the TSRCFlat2 and STL11k
http://deepspaceplace.com/show.php?id=ngc3293b

James
Quote:
Originally Posted by marki View Post
That flattener James suggested looks like a better option as it is purpose built for the RC 8 and 10 and supports up 45mm image circle. Only 109mm BF needed and Same mob make them (TS). Teleskop shop is good to deal with as well but you will have to email them and they will give you their paypal account details.

Mark
Thanks Guy's I have ordered the 2.5 inch FF and will see how it goes. The big problem is the distance from the CCD to the FF which in itself may tend to cut off the light cone. I have ordered some adapters but will have to get some custom tube work done when I have been able to test it and get some accurate measurements. I am not a real believer in stated distances and find often they can be set up better.

Thanks again
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