It's a bird

by Vian Esterhuizen

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Automatic zoom feature would require an information link between camera operator and camera itself because in most cases the operator knows the best what zoom level is desired at the moment.


In general STM lenses have quieter and smoother focus than their non-STM counterparts, especially compared to USM lenses. If you are shooting video with 2012 or newer EOS body (from the 650D onward) then this is a distinct advantage. If you are shooting stills then the typically faster focus speed of the non-STM lens is more of an advantage. In the case of ...

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