As reported below, everything about this lens is a strength: It’s well designed and built; truly a professional- grade optic. The focal length is a mm or so off from the theoretical ideal of a “normal” lens for the 60 x 70mm format, i.e., the diagonal of the frame or 92.2mm. (In fact most 6 x 7 MF cameras run a bit under 60mm on the short side—more like 57mm or so, making a 90mm lens dead-on normal; assurance for you gearheads who sweat this stuff..!) If you only own one lens for your Brick, this should be on your short list. (Moving from 35mm to MF & and want something closer to your 50mm normal? The 127mm is your answer, and is the smallest, lightest of the RB67 lens family.) Sharpest lens you could ask for, and like all RB/RZ lenses, renders a 2D image of a 3D subject with outstanding fidelity and depth. (In fairness, Fuji lenses for their G-Series rangefinders are the absolute sharpest imaginable. But their images lack the “roundness” of the Mamiya glass. They look like photographs of photographs, not 3D subjects, IMHO. Study Flickr images to see...). To my eyes, they trump Hasselblad and Zeiss glass as well in this regard. Amazing!! Uses the same 77mm filter threads almost all the rest do. Can’t see any chromatic aberrations or distortions at all. If they exist, they are meaningless. No second mortgage or selling of body parts needed to acquire good specimens on e-Bay. Japanese vendors for American shutterbugs are generally terrific, lots of stock available.

Weight & size if you are moving up from 35mm or digital. Not an issue at all for folks using RBs (aka: Bricks); that’s the price of joining the RB Club! Some feel f/3.5 is too slow. Again, MF is not for the faint of heart. A 90mm non-Tessar lens to cover a 6 x 7 negative with a maximum aperture of f/1.4 would probably weigh ten pounds, with a filter diameter of 300mm or so! Matching film speed to subject and lighting is your only answer; buy or dig out your copies of Ansel Adams’ The Negative, and The Camera. Read and take notes. Or plan on shelling out around $60,000 USD for a digital back...

A very sharp lens with close-foucs correction.

Heavy!

A beautiful lens with tank-solid build quality. A no-excuses normal with close-focus correction. And very heavy.

Customer Service

Tops!

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90 (pre-C)...good
90 NB ...very good
90 C ...better still
90 KL ...best yet

Optical quality is excellent. Build quality is excellent.
Handles flare very well.

None really. This lens is heavy but if you have already invested in the RB system this is unlikely to be an issue.

A top quality lens that is built to endure professional use. Sharpness is excellent from centre to edge from f5.6 - f32. Edges slightly soft when used wide open.I would highly recommend this lens.

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This lens is a complete contrast to my dreadful RB50mmc.