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Old 06-05-2012, 08:46 AM
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floyd_2 (Dean)
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Join Date: Dec 2009
Location: Cecil Hills (Sydney)
Posts: 557
Depth of Focus & Stopping Down Fast Newtonians

I thought that I would share a link that I found that clearly discusses depth of focus, seeing, stopping down fast Newtonians and so on. It's a great read and probably a must read for anyone currently considering a fast newtonian.

I'm going to experiment with stopping my 15" down to 5" for planetary and lunar viewing if seeing doesn't allow decent viewing at full aperture. I have already made an aperture mask from protostar flock board and will try it out next time it looks like full aperture planetary viewing just isn't working out.

Certainly, I don't think I have ever owned a fast telescope that could top the planetary views that my original 10" f/6 offered. Anyway, for any who are interested, it's a really clear, good read:

http://www.brayebrookobservatory.org...thoffocus.html

Dean
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