Jim,

I use Astronomik CLS filters, which work extremely well for me.
Without them, I'm limited to ~60s exposures by LP. With a CLS,
I regularly image with 5 and 10 minute subs. Wouldn't be without
them.
FYI, I use a 1.25" one for long-exposure modified webcams and a
2" one for my IR modified Canon 350D (have tested up to 45m on
that one.)

HTH,
--
Rob (~52N, ~1W)

"jim" wrote in message
...
What's the current thought on these? Are there any out there that are
worth the money?

I already have an Astronomik UHC filter which is pretty good, but I'm
wondering if a more general pupose filter might be better for casual
deep sky stuff from a fairly badly light-polluted location (Stafford,
UK).

Jim
--
"Well, well. We've come a long way from the Prime Minister's
exploding cake." - Adam West, Batman.

http://www.UrsaMinorBeta.co.uk http://twitter.com/GreyAreaUK