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Old 23-10-2012, 07:22 PM
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cometcatcher (Kevin)
<--- Comet Hale-Bopp

cometcatcher is offline
Join Date: Jan 2005
Location: Cloudy Mackay
Posts: 6,198
There's lots of filters to choose from and it can get confusing. I would highly recommend the Astronomik CLS for starters. It's very similar to the Lumicon Deep Sky, with just a dash more blue in the passband.

Here's a comparison between a Badder Semi-apo and Lumicon Deep Sky for the running chicken IC2944. Both are 1 hour total exposure through an ED80. The Deep Sky has some bloating of stars because it's old and has worn coatings, but still flogs no filter or the Semi-apo for Ha. I have replaced it with the Astronomik CLS which is almost identical except no star bloating.

I do have some light pollution here which may be increasing the filter effect.
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