mhammady post=70431 wrote: Hi Peter,
These readings were from the WO Z61 with a 2" Rack/Pinion focuser, and I'm connected directly to the course knob (not the fine). Any ideas what else can be wrong?
In that case it could be temperature variation. If you put out the telescope from a warm room into the cold, it will change focus until it's temperature stabilized. For a test like the above, I'd wait at least an hour after having brought the telescope out (My 140mm needs almost 2 hours...)
Or the coupler between motor and focus axis isn't solidly fixed. Apart from that, I'm out of ideas....
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