Quote:
Originally Posted by multiweb
Do you have a Meade or Celestron?
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Meade. There's a physical indentation to orient the secondary onto the secondary holder (I suspect to ensure the holes line up before inserting bolts), but no other marks anywhere in the optical system.
(FWIW, my corrector/secondary assembly is centred +/- 0.08mm and, taking an average of many measurements around the front corrector cell, the cell is "round" to within +/- 0.05mm, so I have high confidence I'm getting centring right. Corrector/secondary centring was out of whack by ~1mm when I got it - it definitely makes a difference!).