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I have an Astronomiks UHC and OIII in addition to a 2" DGM NPB. The DGM NPB is sold as a narrowband filter but in reality it has a very narrow passband and is a hybrid between an OIII and a UHC IMO.
Whilst I agree that the UHC filter gets the most use it isn't by very much and I am often only using a 10" scope. On a good number of targets the OIII does just as well as the UHC and on many targets I prefer the view with the OIII. In a lot of cases whilst the view in the OIII is dimmer than the UHC it sometimes has slightly better contrast and can show more detail. In Robbo's 30" I would think the OIII would see more use than the UHC but I believe there is plenty of room for both. Certainly some targets respond better to a UHC and vice versa.
Some of the targets that I like to use the OIII on include, keeping in mind the UHC also works well on some of these:-
NGC 2070 (Tarantula)
NGC 1360 (Planetary in Fornax)
NGC 6992/5 (Veil)
NGC 246 (Planetary in Cetus)
M8 (Lagoon)
NGC 2467 (Thors Helmut)
NGC 3242 (Ghost of Jupiter)
NGC 7293 (Helix)
M17 (Swan)
These are just a few targets on which I prefer to use the OIII, there are lots of others. It comes down in many cases to personal preference as in a lot of cases the UHC and OIII will show slightly different complimentary detail.
There is certainly plenty of room for both, particularly with a 30" scope.
CS-John B
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