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Thanks guys for the responses.
Ok so here is the measurements as I remember them. Coming off the back of the scope there is an adapter from the rear to the rotator. It has a 15mm back focus. Then the adapter from the rotator to the focusor is 10mm. These were the smallest adapters I could get made by Precise Parts.
From the back plate itself the mirror assembly sticks out 25mm. Then there is a GSO adapter that is 25mm connected to that, which can come out of the equation.
The Camera itself with integrated filter wheel takes up 61.84mm. I don't know if that includes the front nose piece on the filter wheel that came off the camera. I suspect that is included.
I then have a 27mm adapter from the focusor to the camera.
The focusor in the centre position takes up 36mm. The Rotator is 61mm.
So that makes 15 + 10 + 25 +25 + 62 +27 + 36 + 61 = 261. I suspect that the noise piece of the camera takes up the last 19mm.
So that makes up the current back focus.
The flattener I chose because either you get a 2" version which is not really big enough or a 4" version. The ASA flattener needs to be set at 108mm from the CCD. So we take off the 62mm from the camera and that leaves 46mm as that adapter. Next the front side which connects to the focusor has to be 45mm long as a minimum according to Precise parts and that is because a portion of this flattener sleeves into the adapter and the adapter cannot have the sleeved bit going through the focusor because of diameter. Now maybe I can change the configuration around and put the focusor first off the scope and then the rotator next and that might allow the sleeved section to go through the rotator. However I am still 20mm short of back focus.
Does that make sense? Marcus how have you got your focusor and rotator configured?
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