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Anonymous
Unregistered
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I am thinking of getting a Lumicon UHC. Would the UHC be the right filter for my 8" DOB 1200 Focal length? Not to dark?
Will a filter show any Nebulosity (is this the right word) in star clusters like M45 or is this only accomplished through photos? I understand it works good for Orion.
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ForgottenMObject
Post Laureate
Reged: 09/11/04
Posts: 3585
Loc: Maryland, US
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The UHC nebula filters are very good and will provide nice views of all sorts of emission nebula. The OIII filters tend to be more specific in what they work best on - planetary nebula are their big thing, and they do tend to darken background stars a lot. Still, the OIII is a good filter.
As for the nebula in the Pleiades, I think that is a reflection nebula, so I am not sure if any filter will work well on it.
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Matthew
IDA member
XT8i, 10x50 binoculars, lots of eyepieces
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pbm77
super member
Reged: 05/21/03
Posts: 160
Loc: Denmark
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Well, my UHC filter (Baader UHC-S) works very well on M45, and it certainly shows the nebula. This kind of filter will be very fine for you scope, like ForgottenMObject said. It will not be nearly as dark as a OIII filter, meaning that you will see more stars with UHC than OIII.
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dgs©
Postmaster
Reged: 03/29/04
Posts: 13896
Loc: West Monroe, Louisiana
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For a general overview of filters see David Knisely's article.
For a really thorough hashing over of which filters are good for which objects see David Knisely's filter comparison article
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- david
8"Ø Newtonian on SVP, Moonlite CR2, Telrad
PST Oberwerk Ultra 15x70 Orion Ultraview 10×50
Hand-me-down Sears Refractor (Discoverer) 60mm×900mm
"What we have done for ourselves alone dies with us; what we have done for others and the world, remains and is immortal." --Albert Pike
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