The best portrait lens I've ever used, but with three "buts" — the Fuji GF 110mm f/2 - Photofocus
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Amazon.com : Fujifilm FUJINON GF 110mm F/2 R WR LM Lens for GFXMedium Format System - Bundle with Hoya NXT Plus 77mm HMC UV Filter, Hoya NXT Plus 77mm HMC Circular Polarizer
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Fujifilm GF 110mm f/2 lens review with 16 high res samples - ProPhotoNut by Lovegrove Adventures