I've used both the clip in filter in my 1000d and the 2" screw in one for my 5d mkii. The 2" screws on to the tring extender. They were the astonimik cls one though not hutech, same thing though.
My advice would be to get the 2", as you will be able to use it on any camera, you can't use the clip in filter on the 5d they don't fit.
Sandy
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