Ice,
I use the UHC the most. The UHC brings most nebula up better as Geoff said.
The O111 is very good to excellent on most Planetary Nebula.
BUT I do find filters a very personal thing.
A lot of observers see things diffrently. Why, well everyones eyes are diffrent. Most think we all see things the same when observing, but I find this most untrue.
It's funny how some see things then others do not!!
Experience counts for a lot, also age, younger eyes do see better!
Size of the telescope does make a diffrence. Small scopes do not cope well with the O111.
Small scopes are best with the Light Pollution Filter(LPR) or Deep Sky filter(bit old fashioned there)
Anything over 8 inch all filters will make a diffrence. My friend with the 14Lx200 doesn't really like any filters!!
I have many filters, but the one I use the most is the UHC, then the O111. I don't use the LPR or the Swan Band (for comets) much.
Color filters is a diffrent story again!!
Hope this helps.
Best. (and still under cloud)
