some fantasy I just thought about:
With film cameras, it makes a lot of sense that there are tele converters increasing the focal length of your SLR lens, but no wide converters (if the lens is not wide enough, you won't get a wider angle, just round corners).
With digital SLR's with crop factors, however, would it not be possible to design a wide converter (actually a reversed tele converter) that projects the picture to the smaller area of the non-FF CMOS sensor?
Maybe somebody with more knowledge in optical theory has an opinion on this ... but I think if some company came up with such an appendage that provided the optical quality of, say, the Canon 1,4 tele converter, many users of digital SLR's would be interested...
Regards,
Andy
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