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Or maybe a switch when you want to use "APS-C" mode... a 3-way toggle? For FF, 1.3x crop and 1.5x crop... So the DA*s would act as a 24-75mm and 75-200mm lens albeit lesser MPs (though roughly the same as the current k20 I guess), while the FA's and other FF lenses can be used as they were intended... if not, then DA lens users would feel cheated in a way...
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