I'm attempting to adjust collimation on my 400mm classical cassegrain for the first time. I have the ASA laser collimator and I've read the collimation manual (http://www.astrosyst...on_Manual_E.pdf). However this lacks information on the physical location and operation of the collimation screws.
Specifically, there are 9 screws on the back of the primary mirror cell:
- I understand that some are "push" and some are "pull", but which are which?
- Do they rotate clockwise or anticlockwise?
- How tight should they be adjusted to prevent movement but avoid damage?
- What is the recommended procedure (adjust one set of 3 while keeping the others tight, loosen all "pull" screws first then adjust, or what)?
- What is the recommended attitude when collimating (e.g. OTA pointing at zenith so primary rests evenly on "push" screws)?
Similarly there are screws both on the back of the secondary mirror cell and the side:
- Which of these are used for collimation adjustment, and how?
May be obvious questions, but I don't want to risk damaging the mirrors or making collimation worse (it is currently only slightly out) so am looking for detailed guidance (ideally with photos so it is absolutely clear which screws are which) before I attempt this.
Edited by nakbrooks, 12 November 2013 - 04:22 PM.