Posts Made By: John Adlington

Is there anything particularly challenging about
breaking down an MN-56 for cleaning and being able
to get it back together without any major alignment
problems? Any tips or tricks or a posted procedure
somewhere?

Thanks,
John

Checking the collimation on my MN-56, there is a slight
disagreement between the two techniques. When I align using
the center mark and a Cheshire, the out of focus star test
is not quite concentric, and when I get the center-of-the field rings concentric, the Cheshire results are a bit off.
I know if the center mark is not accurate or if the optical
center of the mirror does not coincide with the physical
center, then that will throw the Cheshire off, so is the
out-of-focus star test ultimately the most accurate method
for checking collimation?

Has anybody tried this one? How does it compare to the others in the series - it's considerably more expensive.

Anyone recommend a good solar filter for a new MN-56?
Thanks.