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Hi,
Had a couple of questions on your alt-az drive
are you using any rubber bushes or coating on the metal rollers to aid friction thereby reducing the need for added tension to the rollers and avoid slippage? what would happen after a period of wear on the metal rollers?
when you say bartelized dobsonian, I presume its adopting methods described by mel bartel, but just wanted to understand what it actually does. does it auto track using a secondary guide star, or is it for motorized slew on alt and azimuth axes or is it for normal tracking using fixed rate motion
if for tracking, how do you get around field rotation thats inherent with alt-az mounts?
do you use prime photography or field projection if you're using it for astrophotography, and if prime, did you have to move the mirror?
I was thinking of prime with a reflector, but by making the focusser detachable, and using an alternate support for the camera thats low profile, that may get away with the need to move the mirror forward to achieve focus.
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