Focusing 'wobble' in CPC11 fixes?
Posted 10 June 2013 - 12:26 PM
Note that the wobble I'm talking about is distinctly different from oscillations related to dampening times or oscillations induced by touching the scope. They are also distinctly different from the mirror shift often observed when reversing focus direction.
The best fix I've found so far: back the mirror all the way to the rear of the scope, the 'parked' position used while shipping, loosen the orange focuser retaining ring, ensure the focus knob is centered in the whole, and re-tighten the orange retaining ring while the mirror is tightly in the parked position.
The location of the rubber ring in the bearing stack appears to have an impact as well. It appears to have the most positive impact when it's located between the retainer and the outermost bearing, as opposed to between the rear casting and the inner bearing. The outer position is probably 'stock', but I played with it's location after complete disassembly of the entire ota when I added active venting.
I removed removed most of the issue at this point, but I'd like to know what others have done or observed...
Posted 10 June 2013 - 02:40 PM
Posted 10 June 2013 - 03:43 PM
Curious, though, if other DIYers have observed the phenomenon and/or have found solutions.
Seems like I remember other folks having mentioned this here on CN in the past. I believe that's where I got the 'fix' mentioned in my OP, but I can't remember for certain.
Posted 10 June 2013 - 11:25 PM
Posted 11 June 2013 - 09:25 AM