Just a side note on focal-length shortening with close-focusing...
The PanaLeica 14-50 has one of the most aggressive focal-length change I've
ever seen with focus adjustment.
The DZ 14-54 stays almost the same, but it is most certainly a varifocal
design as you have to readjust focus after any focal-length change, but the
14-50 keeps the focus the same when you change focal-length, but the
focal-length changes when you focus.
AG
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