Taking the risk of launching a topic which has been treated before: Why do makers insist on using '35mm' (read: FF) focal length numbers for lenses which were specifically designed for use on their aps-c (read: crop) cameras?
For example: Canon's EF-S lenses are not supposed to be used on anything else but Canon's aps-c cameras, so why do we have to multiply EF-S xxmm by 1,6x to get to the 'real' focal length. Wouldn't it be easier to for example call the EF-S 60mm f/2.8 Macro an EF-S '97mm' f/2.8 Macro?
Even Olympus, who with their "digital from the ground up" 4/3 system, insists on having us multiply what ever lens of theirs we buy by 2 to get to the real/actual focal length... Who tackles this one for me? Thanks!!