" Starlight Feathertouch Crayford ... visual I don't think it's possible to use along with my 2" diagonal"
I don't see why not unless it causes the back focus to exceed the corrector's specs, which?may not be noticeable in the EP.? But I don't see much advantage to using an external focuser for Visual use.? The built-in focuser is right there next to your eye and SCT image shift is not a real?issue (unlike for some small cameras where?a focus star might shift off the chip).
As for cameras, there should be no problem at all adapting any camera to prime focus imaging with the external focuser. But things get a bit squirrely when using the custom reducer because it requires a?specific back-focus with very small tolerance.? (BTW, reduction is a?near necessity for the MallinCam, which requires a low f-ratio to work properly).??The reducer?virtually prohibits the use of an external focuser because that focuser varies the critical back-focus required by the reducer. The focuser?may be able to be inserted (check all the distances) but it could only be used to perform small tweaks in concert with the internal focuser and hardly seems worthwhile.
I wouldn't over-plan this. Don't sell (or buy) anything until you have some experience and experimentation?with the scope and truly know what is needed and not needed.
Stan
