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[Antmag89]

Hi everyone, I wanted to ask you something. I photograph in cities with very strong light pollution, in fact I can see at most the main stars of each constellation. I use a ts 70/420 reduced to 336 and a Baader modified Canon 1100d. I have already used the Optlong L- filter but without having great results and I was thinking of buying either the ultimate or the extreme. Have any of you used it with a reflex camera or can you give me some advice?

[FrostByte]

Which filter do you have, the L-Pro or L-enhance? The narrower filters will certainly do a much better job of cutting out unwanted light pollution for emission nebulae, although they won't be much use for anything else. I have a set of the Antlia dual-band filters which are 5-nm, and am really happy with them. I only see halos on the brightest of the bright stars, and the narrow band pass does a really good job of isolating emission nebulae signal during full moon. 

 

It is REALLY HARD to frame and focus with a dual-band filter and DSLR... and the narrower the band pass, the more difficult. Software control of camera, focuser, and mount is really essential, otherwise you're in for a world of frustration.