[h0ughy (David)]

i was going to get a second astronomik 2" cls filter to use with the hyperstar and qhy10, but then i reaD ITS FOR F3 AND ABOVE? So what do i use at f2?

taken from bintel:


Astronomik CLS CCD (2")

Click here for larger picture

$259.00





The Astronomik CLS CCD is suitable under light-polluted skies for imagers without IR-blocking filters, including DSLR cameras modified for astrophotography. The filter enhances the contrast between all deep-sky objects and the sky background.
The CLS-CCD Filter enhances the contrast between astronomical objects and the background. Due to the wider transmission curve compared to UHC filters, a greater amount of light will pass the filter. Stars will be less dimmed. This filter has been optimized to block as much spurious light as possible and simultaneously provide the best performance for 'useful' light.

A good filter for DSLR-, CCD- and film b/w-photography as well as observation of deep-sky-objects with telescopes or photo lenses of all aperture f/3 and above.