Earlier today, Fujifilm unveiled its lightest, smallest medium format lens yet. The GF 50mm f/3.5 R LM WR expands the lineup of lenses available for the GFX series mirrorless medium format cameras, adding an incredibly portable, almost pancake-style 50mm that weighs only 335g (11.8 oz.). With a full-frame equivalent focal length of 40mm and a reasonably fast f/3.5 maximum aperture, Fujifilm is targeting this lens at street shooters who have also picked up its rangefinder-style GFX 50R. The press release…