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Thanks
Yes the filters definately help but only with emission line objects such as Planetary and Emission nebulae. They dont really help with galaxies because they produce broadband light that the filter also blocks. One needs longer exposures though, to get the best from the UHCS, O3 and Ha filters I use.
The filters might not make such a difference from a dark sky location. However with the fast lens it would probably reach the natural skyglow from atmospheric oxygen in 10 or 15 minute exposures, so even there the UHCS filter would be useful. here at my place even on a good night, shots of more then 2 minutes without the filter are too bright, with the filter I can go 3 times longer.
Scott
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