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I actually have the STC filter but have not yet had the opportunity to try it out in the field. I tested it at home when it first arrived but quickly determined - not unexpectedly - that exposures have to be quite long, even with a full spectrum modified camera. As I didn't have a star tracker to hand at that point the brief experiment ended...
I can say that it does seem to do exactly what you would expect but, unfortunately, the STC solution to 'clip in' involves sticking the filter onto the camera body with some small, semi-sticky pads. These are supposedly multi-use but difficult to position precisely and IMHO are nowhere near as elegant as the Kolari magnetic solution. They seem rather low-tech by comparison - even though this is actually quite an expensive filter.
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