Author Topic: OIII or UHC Filter?  (Read 1250 times)

Jacob Cota

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Re: OIII or UHC Filter?
« Reply #30 on: February 09, 2018, 09:48:13 AM »


I was told by some more experienced folks that UHC or like Orion Ultranlock are best for 8" aperture, OIII coming into better use at higher apertures.

I agree. Most people who say O-III filters aren't "too dark' are using scopes 10 inches or larger.
No most people who say this know exactly how to use an OIII filter in a smaller scope. One of my favorite views of the North American Nebula is in my 100mm f/6 refractor at 15x and 25x using the Lumicon OIII filter. You have to use the right power range, get fully dark adapted, and use averted vision, but an OIII filter can be effectively used in apertures smaller than eight inches. Clear skies to you.
Really, that's encouraging as I have a 80 and 102mm refractor and I can get down to 20-30x in them and I do have an OIII filter. I found the Veil last year, but not the NA nebula. I didn't think I could see it in my red zone though?