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Hi,
I have the Astronomiks UHC and OIII and use both in my 10"/F5 and 18"/F4.5.
To be honest there are only a handfull of targets where you would notice a significant gain by the OIII over the UHC, in a 10" scope. Whilst the OIII works well on many targets the UHC does equally well on about 90% of those same targets. On most targets where the OIII would be the filter of choice, the UHC will achieve 90% to 95% of the gain the OIII achieves. Importantly, the UHC works on a wider range of targets than the OIII. For instance in my 18" scope the UHC helps significantly on the Horsehead Nebula. The OIII is useless on the same target. As mentioned above , the converse rarely applies where the OIII works and the UHC does nothing. Also keep in mind that while the Astronomiks OIII is less aggressive than most OIII filters, in that it blocks out less of the background stars and detail, it is clearly way more aggressive than any UHC and will block a lot of the background stars and detail from combined emission nebula and Clusters in a 10" scope.
If money is no object you could certainly use both from time to time. But, if money is a consideration in any way, I can think of plenty of things to buy before adding an OIII filter to your arsenal, considering you have a 10" scope and already have a very good UHC filter.
Cheers,
John B
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