Zeiss ZM 28mm f/2.8 C-Biogon T*
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.
Not yet tested.
MTF charts suggest that this lens has some field curvature, typical for a 28mm design.
Per Zeiss. See the datasheet.
|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|
|Dimensions (with caps):||ø 53 mm, length 62 mm|
The barrel distortion of the 28/2.8 Biogon is only about 1% by the far corners, excellent for a 28mm lens.