I use the
Astronomik CLS (EOS-Clip) filter and I am very impressed with its performance in my Canon 40D. It is simple to clip it in although it could be a bit tedious if you had to insert/remove it for night time then day time shots on a regular basis, I don’t know if was designed or intended for repeated insertions/removals.
Here are 3 shots:
- Raw straight out of camera, without filter, 60mm lens, 60 secs.
- Raw straight out of camera, WITH FILTER (17-40mm lens at 17mm), 60 secs.
- Same image as above but processed to look pretty.
Well worth the investment in my opinion.
Cheers
Dennis