This could be interesting. 105 at f/2.8 theoretically only needs a 37.5mm objective, so the lens size will likely be determined by the retrofocus nature of the short end, but maybe there is a trick to be had there as well given the short flange distance. I am not ready to rule this puppy out so early in the rumor cycle. For reference, have you ever seen a 16mm f/2.8 as small (and inexpensive) as the RF 16?
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