Low profile focuser instead of moving primary up tube.
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.
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