A few months back, I purchased a new old lens for the Rolleiflex SL66 -- the 80 mm f/4 Distagon. This lens has an interesting trick up its sleeve -- a leaf shutter, originally for syncing with studio lights. But for me, the lens, with its internal shutter, is part of the contingency plan for my old SL66. You see, if the camera's focal plane shutter ever craps out on me, I'm going to set it to bulb and rely on the leaf shutter for exposure... Anyway, I finally got around to testing the thing out the other day. Long story short, it is a marvelous lens, noticeably better optically than the 80 mm f/2.8.
Tasting notes: Ilford HP5+ exposed at ISO 800 and pushed two stops in DDX 1+4.