[mrsnipey]

Hi all, I have a 12" dob and I want to do Astro-Photography with it using my Canon DSLR.
I've read that people move their mirrors up the tube but would I be able to just replace
my focuser with something like a "Bintel Crayford Focuser Low Profile 10:1" to get to focus?

I don't really want to move the mirror if I can avoid it.
If I do have to move the mirror, how do I calculate how much I have to
move it up the tube? Any help would be appreciated.

(Unsteady hands + bad metal working skills = recipe for disaster)

Thanks,
Denis.