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I got the O111 before I got an Orion Ultra block (same thing as a UHC). I used that O111 a lot in my 8 and 14.5" telescopes, but it does dim the image a lot. But then I got an Orion Ultrablock and things changed. Nowadays I tend to use the O111 as the filter of last resort when the Ultra block doesn't show me the 10 or 15% or so of faint, point like planetary nebulas - the O111 usually brings them out.
For smaller 5" telescopes, I find my Ultrablock dims the image too much, so I like the broader UHC type filters, like Kson or Astronomik UHC-E filters, much better in them.
In smaller 80mm telescopes, I tend to use the broadband Skyglow or Celestron LPR filters.
As for the H-Beta, perhaps someone can do a service of renting one out, because, apart from the Horsehead, the Comma under the Orion nebula, I think the California nebula (or some other one in that general direction) and another I came across by accident - I've found no other use for it.
Regards,
Renato
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