|
The small amount of distortion that can occur if the mirror clips are tight enough to stop the mirror moving around on its carrier are much easier to live with than a mirror that slips when you move the telescope. If the mirror moves you are never going to get it collimated.
Also the collimation is not complete when the laser beam returns properly this is only the start of collimation. The real collimation starts when you do the star testing part.
The aim of collimation is to get every point on the mirror surface to focus at the same place. This requires very careful movement of the primary mirror mainly in distances less than the wavelength of light
Theirry Legault did an excellent report on collimation. Everyone should read it before starting a collimation.
Barry
|