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Zeiss ZM 28mm f/2.8 C-Biogon T*

The Zeiss ZM 28mm f/2.8 C-Biogon (about $1005) is a relatively inexpensive 28mm lens of very compact dimensions and light weight.

Composing with the 28/2.8 Biogon can use the optional 25/28mm ZI viewfinder, or the built in frame lines of the Leica M9. The rectangular lens hood is also advised.

Image quality

Not yet tested.

MTF charts suggest that this lens has some field curvature, typical for a 28mm design.

Specifications

Per Zeiss. See the datasheet.

Zeiss ZM 28mm f/2.8 Biogon
Focal length: 28mm
Aperture scale: f/2.8 - f/22
Focusing range: 0.5m - infinity
Angular field, diag./horiz./vert 75/65/46 °
Coverage at close range: 37 cm x 55 cm
Image ratio at close range:            1:16
Number of elements/groups: 8 elements in 6 groups
Filter thread: M 46 x 0.75
Weight: 230g
Dimensions (with caps): ø 53 mm, length 62 mm
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Distortion

The barrel distortion of the 28/2.8 Biogon is only about 1% by the far corners, excellent for a 28mm lens.

Distortion of the Zeiss ZM 25/2.8 Biogon

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