#21  
Old 21-07-2012, 02:02 PM
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JohnH
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Not sure if this will help as my setup is a ccd not a dslr. I have the FR mounted in the holder and about 3/4 of the way forward (ie towards the OTA). I have a CFW10 on the front of my ST2000 so the end of the draw tube to the ccd surface is about 33mm and the FR to ccd is about 95mm (just a bit under the recommended spacing). I get focus with about 15mm of out travel on the draw tube.

AFAIK the sensor on a DSLR is about 55mm behind the front of a Tring so the spacing should be about right with the FR is the middle of the range. you do not have the FR mounted in the holder backwards do you?

I have a Canon 20d as well so I will try it out, pretty sure it should work ok...
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  #22  
Old 22-07-2012, 11:03 PM
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Osirisra (Ken)
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I'm just about to grab a Moonlite for my RC8 as well, to be able to put the CCDT67 internally on the tube do I get the 1.5" drawtube that moonlite says is for the RC8 or do I get the 1.15" tube which they say is for the AP reducer??
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  #23  
Old 23-07-2012, 06:50 AM
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DavidTrap (David)
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Talk to the guy at Moonlite - very helpful chap.

DT
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  #24  
Old 24-07-2012, 06:08 AM
dp297 (Dimitris)
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Well,
I have tested my DSLR 350D with the Moonlite focuser and RC8 with the internal positioning of the CCDT67 and I can safely say that 350D will NOT focus (the focuser is attached directly to the OTA without any extension before the focuser). Not enough backfocus. It just needs a couple of mm inwards to focus but thats impossible due to the T-ring.
The only way the system reaches focus is by attaching the CCDT67 directly to the DLSR via a 30cm T2/2' adapter + T-ring and insert the thing into the focuser. It reaches focus with about 2-3cm out on the drawtube.
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  #25  
Old 24-07-2012, 04:03 PM
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Dimitris
You have the correct spacing for your camera to ccdt67. It works like this 16mm for the ccdt67+ 30mm for your spacer+ 55mm for your t ring and camera to the chip= 101mm. Perfect spacing.
That's the way it works, if you had a qhy10 ccd the spacing from the front of the camera to the chip is 20mm which gives an extra 35mm to play with and thus you can attach the ccdt67 into the focuser.
Hope you now get some clear skies.
Allan
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  #26  
Old 24-07-2012, 11:59 PM
dp297 (Dimitris)
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Quote:
Originally Posted by allan gould View Post
Dimitris
You have the correct spacing for your camera to ccdt67. It works like this 16mm for the ccdt67+ 30mm for your spacer+ 55mm for your t ring and camera to the chip= 101mm. Perfect spacing.
That's the way it works, if you had a qhy10 ccd the spacing from the front of the camera to the chip is 20mm which gives an extra 35mm to play with and thus you can attach the ccdt67 into the focuser.
Hope you now get some clear skies.
Allan
Yes, I managed to get it right.
I am just wondering, just for fun. Should I want to increase the reduction beyond 0.68 (effectively increase the distance from 101mm to 110-120mm), will I have enough backfocus or not?
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