Quote:
Originally Posted by alpal
Putting it into perspective:
The primary mirror moving around is a bugbear of just about every Newt.
What mirror cell can you buy that has any design in it that stops lateral movement?
People put stronger collimation springs in which helps but only masks the problem.
This should have been sorted out 40 years ago by the all those so called engineers
who designed the mirror cells.
Amateurs have had to do DIY modifications to make things work properly.
Consumer law says that a product sold should be fit for the purpose to which it is intended.
No one should have to re-collimate their Newt. every time they use it.
They should hold collimation for months or even years and certainly not change
collimation when the OTA is moved from vertical to horizontal.
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The reason the so called engineers didn't sort it out 40 years ago is because it was sorted out a long time before that. Have a read of the ATM Porter Series of books written in the 1930's. Pretty sure there is a design in there in one of the first two volumes. My newt mirror cell is based on that hundred year old design and made in 1980. It has no springs, just 6 screws, 3 push, three pull, once set and locked, no droop or shift of the optical axis.