The Astronomik CLS is suitable under light-polluted skies for DSLR Cameras which have been remodeled for astronomical use. The filter enhances the contrast between all deep-sky objects and the background.
139 Euros from the manufacturer (
http://www.astronomik.com/en/filter-...cd-filter.html) or A$200 from Bintel (
http://www.bintel.com.au/Astrophotog...oductview.aspx).
I have one I don't use so it can go for A$125 posted.
Peter