En ik copy-paste nogal wat, wellicht wat onnodig. :) Maar ik las dit ook nog:
“Very easy.
You need a laser collimator (like the baader which is sure, there are others surely), a cheschire but preferably an artificial star.
Insert the laser in the eyepiece holter (no diagonal) and see the trace on the lens or a paper to see if this is centered: at 1mm and less should be OK. Correct if this is more.
When done, insert your cheschire and center all the reflexion circles to the draw eyepiece tube and internal lens cell circles with acting on the push-pull screws on the cell. Bee sure of the cheschire quality, test it on a collimated OTA to see the perfect image (we saw bad ones).
That’s it.
The more acurate is to finish with the artificial star at high power (2xD in mm at least). When done this is directly usable on sky. The cheschire method for phase 2 is less acurate and you may need to retouch on sky the collimation, a little.
I did this frequently on my 80, 100 and 150mm refractor without problem.
One thing to add be sure that the eyepiece holder is well mechanichally centered with the lens cell say at 0.5-1mm max tolerance (which is enough). Think that for the measures the refrence is rather the circular tube which is easy to level and the lens cell and eyepiece holder positionned with this reference.
The refractor design is rather tolerant but try to reduce at the maximum possible the said tolerances.
”
En ik vond een documentje over collimatie hiervan.