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I have one of these, a Baader 2" UHC

https://www.firstlightoptics.com/uhc-oiii-visual-filters/baader-uhc-s-filter.html

I find it very useful for moderate light pollution and when the Moon is starting to cast shadows.  The 2" thread allows me to screw into a filter wheel or Flield flatteners or Coma correctors etc....  so good for DSLR and CCD, maybe even eyepieces..... but I tend to image and so I'm not sure on the last point.

I was just posting another thread on Imaging with an 80mm when I saw your post pop up.

Here is a pic I took last night using it and an 80mm F6.25 'frac, with modded DSLR.

 

5a353c28207a6_FandHHphas321mins80ed800.thumb.jpg.9826cc5a5e31a81fbf8d54361a5a0a02.jpg

Sean.

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Hi Seb,

Thanks for your post. I have been using an Astronomik clip-in UHC filter since mid-November in my Canon 600D. I live in quite a light polluted area and with the filter have been able to comfortably take 8 minute light frames of nebulae with my Star Adventurer mount, DSLR and 85mm lens at ISO 200 and f/2. It has let me escape a lot of the limitation caused by light pollution. I would recommend it to you.

A couple of images taken this way. The Heart and Soul Nebulae region-

HSN2-SGL.thumb.jpg.95512aaa22f15b66d6d1fa45aec7c2df.jpg

And the Flaming Star Nebula region-

5a3bece2ae14b_FlameNebularegion_SGL.thumb.jpg.bd126608aacdb8923a27f2d9f07722a4.jpg

Cheers,
Steve

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I have used the 2"/48mm Baader UHC-S successfully on a DSLR but there are two potential disadvantages - if you have to step down a lot from the lens filter size you will be stopping down the aperture and may get vignetting, and it's hard to see stars to focus on with wider angle lenses.

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