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Thanks Samir, easy to see the differences between the filters visually by looking at your spectra - more intuitively satisfying than looking at spectral plots.

Any thoughts on the differences between putting the filter in the camera body (clip in style) vs upstream in the optical path (2 inch filter thread style)?

For me, I have an unmodified Canon 40D with built in filter window in place in the camera body. Main concern I have is picking up and imaging back reflections leading to halos on brighter stars. I'd suspect the clip in would be more susceptible to this being closer to the image plane and built in filter, but looking for experience / opinions.

Thanks

Mark

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I believe that experience with astroCCDs has shown that the most problematic halos are caused by reflections from glass that is very close to the sensor (a mm to a few mm) like the cover glass of an astroCCD, much more so than glass that is at a cm or further away (like in a filter wheel). For DSLRs the pop-in filters are still more than a couple of cm from the sensor. So I do not "think" they will cause problems. Halos are very difficult to trace the cause of, so that's why I say "think".

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