At just 15mm in length and 60g in weight, I can't think of a smaller full-frame lens, and you know what, it ain't bad either ...
The Leica Summicron-M 28mm f/2 ASPH. ($4,295) is an excellent wide-angle lens for M-mount cameras. It captures images that are sharp from edge to edge at every aperture, but carries a hefty price tag.
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