John, don't forget to end the quote's with [ /QUOTE] (remove the space).
For many months now i've tossed up the idea of getting a UHC or OIII, and I looked at the Orion Ultrablock at well which is a little bit cheaper.
$180-$190 for the astronomik UHC/OIII isn't cheap, and it's probably not something you're going to use every night - as John B says
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but remember filters really only improve the views on Planetary and Emission Nebula
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Having looked through xstream and Rodstars OIII filter on M42, NGC2070 and Eta Carina and some planetary nebs at the SPSP, it does give you a different view.. more detail in some areas but less in others.
I still want to get one, but they're just not on the top of my next-to-buy list anymore.