In article , Paul Buglass wrote:

One thing you mentioned Jim about looking for the nebulosity around M45.
Don't use your UHC filter for this because the nebulosity there is a
reflection nebula so the UHC filter will block most of it out.

UHC filters are designed to only let the narrow emission lines of Hydrogen
and Oxygen through, so they really make a huge difference on emission nebula
where most of the light in in these narrow wavelengths. Objects such as
M42, M27, M57, the Flame Nebula, the Eskimo nebula, etc are greatly enhanced
using these filters due to the big increase in contrast you get with a UHC
filter. With the reflection nebula around M45, or M78 for example, you want
a full spectrum, so a narrow band filter such as a UHC or OIII filter is not
useful and will not help.

Ah! Thanks for that. I'll give it another go over the w/e (weather etc. allowing)

Mind you, from what you say then it's unlikely but, heck, you never know until
you try.

Very best wishes and clear, dark skies.

And to you.

Jim
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