Quote:
Originally Posted by raymo
Joe, I would agree that a UHC would be better to have than an OIII if only
having one filter, but a UHC does not do everything that an OIII does. There
are numerous nebulae that respond better to an OIII than a UHC, as a
glance at any of the published comparative lists will verify.
raymo
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I probably worded that a bit badly.. What I mean is that a UHC passes the same lines as an O3 plus a few others. However like you said some objects, often planetary nebula, respond better to the more restrictive O3, but a good UHC will still provide a good boost to the same objects. Overall a UHC filter is more versatile, but if you can afford it get both.