AW: [APML] Provia trails

["Ulrich Beinert" <analemma@gmx.de>]

> Do you still think a good general LP filter is worth it,
> like the Lumicon Deep sky Photographic?

Buy an IDAS filter! The Lumicon is old, and has a heavy magenta cast, I
think. The IDAS is extremely color-neutral and works great for cutting
through light fog. I wouldn't use it at a site worse than 4.5 or 5m, but I
wouldn't do any deep sky shooting from such a site at all. Beyond 5m, it's
great and about doubles contrast.

Check out http://www.sciencecenter.net/hutech/ and, for a test report, Mike
Cook' website: http://www.webcom.com/~af9y/

Ulrich


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