If you want to observe (p) magnitude objects, just remember, film emulsions are red sensitive and usually take longer time to expose, hence they are not sensitive to the light of most nebulous objects. Since our eyes are more blue/green sensitive to the light output of most nebulous objects, OIII lines of emission, we can see about 1.5 to 2 magnitudes brighter than the published photographic magnitues. If the object is a reflective nebula, we can usually see these alot better than film and better than filters applied to the eyepiece.
----- Original Message -----
From: Lew Gramer
Sent: Monday, August 27, 2001 9:52 PM
To: Internet Amateur Astronomers Catalog - Discussion
Subject: Re: (IAAC) Obj: IC 1296 - Inst: 200mm Newt F5
Steve, you are certainly right that i1296 was quite a challenge for Kim
to attempt to log in an 8" telescope! Of course, that is not to say that
it wasn't also worth trying... :) After all, published magnitudes for
deep-sky objects are not too often a reliable indicator of their visi-
bility in amateur telescopes! At least not in my experience. But maybe
others find published V (or even P or other band) magnitudes to be more
useful for their observing planning? If so, we'd enjoy hearing from you!
Clear skies,
Lew
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