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|Minimum Focus Distance||1.8' (0.5 m)|
|Angle of View||90 degrees|
|Maximum Diameter||Not specified|
|Weight||10.6 oz (300 g)|
The Carl Zeiss Biogon T* 2,8/21 ZM is a solid alternative to Leica glass for rangefinder shooters, but it's not that sharp at the edges.
Wide field of view. Minimal distortion. Excellent center-weighted sharpness. 0.5-meter close focus. Solid build quality.
Edges of the frame are a little fuzzy. Manual focus only. Hood not included.
I have number of Japanese Zeiss lenses and a German made 15mm . The fit, finish and optical design is excellent on all of them. The only complaint is some of the lenses have excess grease oozing out of the rear portion of the lens. I have had to clean this up with a toothpick and lens tissue.
Durable, Rugged, Strong Construction
What's so surprisingly good about the Zeiss 21mm ZM lens is its sharpness across the frame. It's astonishing, honestly, to see how much sharpness you get within an image. I can pixel-peep my images from my M-E and see barely any distortion or fudging of details.
First off.. this is a no compromise lens. Excellent, super sharp performance. Some online reviews say it's sharper than the Leica 21mm 2.8 which is over twice as much. I used this initially with my (cropped sensor) M8 as a 28mm and now I use it with an M9.
Consistent Output, Durable, Easily Interchangeable, Lightweight, Rugged, Strong Construction