At 8:42 PM -0800 1/7/98, Rob Roy wrote:
>At 16:27 07/01/98 -0800, you wrote:
>>... the O-III needs more
>>than 10" to be effective. It works fine on very bright objects on the
>>10". This filter is ideal on a 20"....
>I agree here 100%. I find the OIII too dark for my 8" and the UHC much
>better for my purposes. A friends 20" Obsession makes much better use of
>an OIII.

The O-III filter works just fine with my 12" LX200. On some objects (eg
the Veil) it is just spectacular. Some objects respond better to a UHC (==
Orion Ultrablock), some to the O-III. You just have to try both and see
which one works best for each object. (Don't bother with galaxies :-)

---
Bill Arnett "Science is a way of trying
San Jose, CA USA not to fool yourself." -- Feynman

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