[SJAAboard] our solar scope's H-alpha filter

[Michael D. Turner]

->-----Original Message-----


->
->  Maybe my elderly (1975) eyepieces have too much light scatter.  Not a
->problem on ordinary objects.  I want to try them in the fixed-up club
->scope.
->
Me too. I would expect the simpler eyepieces to work better at f/30. I don't
remember a particular problem, but at that time I didn't have a large
collection of eyepieces. However, the system worked well for me for
prime-focus photography, and at f/30, focus was a bit easier than it has
been for me in white light at f/6.

->> The Daystar is designed to run in an f/30 system.  Is our 60mm
->> refractor stopped down to increase the f-ratio?
->
->  No, but there is a 3x Barlow supplied by Daystar for just this
->purpose.
->

As I suspected. I experimented with an aperture disc at f/30; no
improvement, just a reduction in light intensity that I didn't need.

->--
->Jim Van Nuland, San Jose (California) Astronomical Association
-><a href="http://www.svpal.org/~jvn/ ">JVN's web site</a>
->
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