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My first experience with filters was to have one for observing in light-polluted suburban backyard with my 200mm Saxon Dob..I chose a Sirius Optics C E 1 (Contrast Enhancment) broadband filter which made Star Clusters like 47 Tuc very bright and sharp!...I then progressed to a Saxon 254mm and then deceided for a Nebula/deepsky filter...I have found the Astronomik's UHC-E a great advantage when viewing bright Nebulae as well as the faint stuff..most of the stars appeared a faint soft blue with pink specks which allows the other wavelength's of light (O III, Ha, etc ) through..the Keyhole Nebula in Carina and the Trifid in Sagittarius is amazingly detailed when coupled with a 25mm EP!!!
Cheers!
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