[helioz (Erwin)]

This a probably a real silly question, but it's got me stumped.

I'm trying to take my first steps in astro photography using prime focus.
Got myself an adapter to fit my EOS450D, put it on, plug it into the focuser.
The problem appears to be that I can't get the focuser in close enough to reach focus.
Compared to with my SPC9000 webcam, it appears the focal plane of the EOS405D is 50mm further back, hence the problem.
I tried this on another telescope - same problem.

My questions relates to the adapter:
Are all camera adapters the same or do some adapters get the camera closer in to the focuser?
Has anyone else experienced the same problem? If so, how did you solve it?

I don't really want to make another tube for my newtonian with the focuser nearer the mirror - I'm hoping that the camera adapter is to blame.

Any help and comment would be appreciated.


Many Thanks