GSO Newtonians : Make sure you clamp the primary

[Catanonia]

I was advised sometime ago that you should have a business card gap between the primary and the mirror clips.

Well I have come to the conclusion that this is wrong, totally. Well if you are using a GSO type cell.

If you don't clamp the mirror, then it will shift and alter the colimation as the scope tilts from horizontal to vertical. Just put some logical thinking behind it and it is obvious, well not to me at the time.

I understand why it was said, mirror pinching, but as long as you don't "clamp" down on the primary, it won't shift and affect your colimation.

Tales of the F2.8 world, brought to you by an extremely frustrated Cat

[laser_jock99]

I'll bear this in mind- planning to join the 'F2.8 club' soon..........