Mamiya N 50mm f/4.5 L

Set up a tripod at the edge of a canyon at first light, 6x7 frame, and you want every blade of grass in the foreground and every ridge on the horizon to bite. A Pentax 67 with a 55mm will do it, but you eat mirror slap and a body that weighs as much as a brick. The Mamiya 7 with the N 50mm f/4.5 L gives you the same coverage on the same negative size out of a leaf-shutter rangefinder you can sling on a fence post. Wide, flat-field, big-negative work where the SLR crowd is fighting vibration, and the lens never quits.

First thing to know before you buy: the 50mm is not rangefinder-coupled for framing. It ships and works with a dedicated external 50mm optical finder that drops into the accessory shoe, so you compose through that bright-line finder and use the body's coupled patch only to nail focus distance. The 43mm and 210mm work the same way. Once you accept the two-eyepiece dance it is quick, but it is not the eye-to-the-window grab shooting you get with the 80mm. Plan for it.

On the Mamiya 7 the 50mm reads like roughly a 24mm to 25mm on 35mm, a true wide. Optically it earns the hype. Mamiya quoted distortion in the neighborhood of 0.04 percent, which is about as straight as glass gets, and the resolution holds into the corners nearly wide open. Stop to f/8 or f/11 and contrast firms up without getting brittle, the kind of file that holds detail through a drum scan. That near-zero distortion is why architecture shooters who live on brick and glass keep one in the bag instead of dragging out a view camera.

The design is a non-retrofocus rangefinder wide, the type rangefinders pull off because there is no mirror box forcing a retrofocus compromise, and it leans on ultra-low-dispersion glass to clean up the aberrations. That correction is where the flat field and the low distortion come from. The price you pay is light falloff in the extreme corners wide open, so for an even sky you stop down or drop an ND grad across the frame on the filter thread. On a clear blue sky at f/4.5 the corners darken and you will see it. That is the real limitation here.

Who shoots it: landscape and travel people who want 6x7 quality without a backpack full of body, plus documentary shooters working off a tripod or hyperfocal scale. At 50mm on this format you are not chasing bokeh, you are chasing the whole scene in focus. One practical note on the shutter. It is a leaf, so flash syncs at every speed up to the body top and the slow end runs long for blue-hour and interior frames. Meter the scene in Zone Light Meter, set the placement you want for the shadows, and the leaf shutter will honor whatever sync or long exposure you dial without the focal-plane ceiling an SLR imposes.

Today these trade used at a price that reflects how few rangefinder systems ever offered a wide this corrected. People cross-shop the whole Mamiya 7 kit against a Fuji GF670 or a 4x5 field setup, and the 50mm is the lens that usually settles it for the dawn-tripod crowd.