Re: ATM Laser Collimators and helical focussers.......

["Bob May" <bobmay@nethere.com>]

The existance of any rotational error in the collimator in the V blocks
(measure at several distances to insure that you aren't crossing the axis at
some point!) will cause this kind of problem.
It is quite easy to get the collimator so that it is pointed right at the
correct spot at 4' but if you measure it at 8' you will get something else
for an answer and that will be a severe problem.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net