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I had come across Astronomik filters before in my searches but had lost the link and not bookmarked it.
I am not sure if they have these to suit the 40D body. (Hutech don't seem to have (yet).) An email to both Hutech and Astronomik has been sent .
They look very interesting as an option to 2" (48mm) screw in filters or monster front filters (77mm) to on the front of telephoto.
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