|
Hi Marc
I have never used a Newtonian, but I do understand that usually, their design makes it impossible to rack the focuser in far enough to get to focus with a DSLR.
As you mentioned, most users get around this by fitting a low profile focuser, or shifting the primary mirror further up the tube to get more of the light cone outside of the tube at the eyepiece end.
In terms of additional optics in the light path, I have found that using a reducer/corrector makes the problem worse on my Vixen refractor and Tak Mewlon; that is, even MORE in-focus is required.
Cheers
Dennis
|