Thread: Which filter?
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Old 17-12-2008, 10:26 PM
Prickly
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Join Date: May 2007
Location: Canberra
Posts: 347
Hi Brendan,

I use a Baader semi-apo filter with my refractor (combination of a moon and skyglow and a fringe killer). I leave it in all the time. It has a slight darkening effect on the sky and helps with the chromatic abberation. Certainly the UHCS darkens the background more and brings out more detail in some nebulae but it darkens the stars so much it cant be used as an "all rounder" on most objects. It might be worth seeing if you can find someone with a moon and skyglow and trying this out. Ive never used the moon and skyglow alone but some reports suggest it may act a little like my experience with the semi-apo. I would say the effect is subtly better but with high light throughput with the semi-apo. Certainly good on jupiter/mars too.

Cheers
David
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