Quote:
Originally Posted by rmcpb
Can't remember the formula but resoultion is directly proportional to aperture. If you reduce your aperture you reduce your resolution so, for that reason, an aperture mask may not be the best way to go. A good 1.25" filter will work for most as the use of 2" lenses is not really necessary for lunar observation.
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I keep forgetting most of you have fast dobs. I've got a F/11.8 Mak so my 28mm 2" eyepiece is the shortest one that shows the whole moon. The next one down at 15mm 1.25" just misses out on the whole moon. So in theory I'd need two filters. I've had a look at my diagonal though and it appears to have threads for a filter. So it looks like I can get away with just a 2" filter in the diagonal for both barrel sizes.
