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OK, a 24 x 36mm is the same coverage as the old historic "35mm Full Frame"
but it really doesn't mean much - there's no 35mm film to compare it with and all the current generation of digital cameras use different lenses etc.
I contend for astronomy, there is no such thing as a 35mm Full frame, just a large 24 x 36mm sensor and I don't think "crop factors" are useful at all. ;-)
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