[MortonH]

In suburban (i.e. light-polluted) areas the best type of filter is a 'deep sky' broadband type (also known as CLS by some manufacturers). The UHC filters are narrowband. Not sure if you can use them for photography.

I have only used my deep sky filter visually and it does make a difference in suburban areas. At dark-sky sites I use either UHC or no filter at all.

My Lumicon Deep Sky filter is actually for sale at the moment (see the Buy/Sell forums). It's a 2" fitting, so it wouldn't be big enough if you want to attach it to the front of a camera lens.

I'm pretty busy studying until Thursday, but if you have any questions feel free to ask.

Cheers

Morton