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Fiske
Carpal Tunnel
Reged: 03/14/04
Posts: 2057
Loc: Missouri / United States
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Re: Best light pollution filters?
07/10/08 08:02 AM
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I'll second the opinion on going with the eyepiece filter. In addition to attaching these to eyepieces, they can also be threaded into the Tele Vue Paracorr and Big Barlow / 2-inch Powermate adapters, providing additional flexibility.
I am not aware of a 1.25 to 2-inch adapter that is threaded for filters, but it would be a useful addition to the tool kit, enabling 2-inch filters to be used with 1.25-inch eyepieces for scopes with a 2-inch focuser.
If you have both 2-inch and 1.25 inch eyepieces, I would suggest going with the 2-inch filter, rather than the 1.25-inch. These filters have much more effect at lower magnifications and wider fields. I have frequently found, at higher magnifications, that I can see more detail without a filter. The reason for this, I suppose, is that higher magnifications significantly increase the contrast between an object and the sky background, which is what the filter itself is designed to do. In this situation, the filter often acts only to reduce the light from the object being observed. Even a small light reduction (as would be the case with narrowband filters like the OIII and UHC) can reduce the visibility of detail at high magnification. Of course, this is not a fixed rule. Sometimes filters do help at high x -- it's something you have to experiment with.
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Fiske Miles
Nikon 8x42 LX / 12x50 SE Binos
Mini Borg 60ED, TV-101, AT80Ach, XT-8, C11/CI-700, 22-Inch Dob
Way too many Nagler eyepieces
http://www.fiskemiles.blogspot.com/
www.fiskemiles.com
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