15 Mar
2013
15 Mar
'13
9:41 a.m.
Make it a printed, hard and fast rule, Rodger. That rule should apply to optical glass solar filters as well. The coating is evaporated metal, just as thin and delicate as that on any first-surface mirror. On Fri, Mar 15, 2013 at 8:20 AM, Rodger C. Fry <rcfry@comcast.net> wrote:
Patrick,
From my experience, you get finer resolution with the full aperture. I have no problem in using a Baader film filter on the refractor as long as the filter is carefully inspected before each use.