On Thu, 08 Mar 2007 12:04:49 GMT, Boo wrote:

So, can you tell me in more detail what the parameters are ? I
have an f/5 12" reflector and an EOS 350D (sensor size 22.2 x 14.8
mm), is this a reasonable combination of focal length and sensor
size ?

And how exactly is focussing done, trial and error or what ?


Trial and error, I think.
I found it to be a total pain in the arse on my first try the other
night. I had to line up the target in the eyepiece, flip the mirror to
the camera, and then try to focus it through the camera viewfinder.
Only thing is, it's so small and dim that you can't make much out at
all. I ended up with the Orion nebula looking like a cluster of orbs
and saturn looked like a street lamp.