CONTAX 21/2.8 Zeiss Distagon T* MM
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Lens/groups: 15/13
Minimum focus: 0.22 m
Angular field: 92° 12'
Filter: 82 mm
Size: 85 x 90.5 mm
Weight: 500 g
Year: 1993
Aperture Real ------- MTF -------
setting aperture Center(*) Border(*) Average(*)
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2.8 0 9.0 7.0 8.1
4 +.1 9.0 7.9 8.6
5.6 +.1 9.0 8.4 8.7
8 0 8.7 8.2 8.5
11 -.1 8.3 7.8 8.1
16 -.2 7.5 6.8 7.3
22 -.2 6.6 6.1 6.4
(*) = (3=poor, 5=sufficient, 7=good, 9=excellent)
Average= region between center and border, not maths average
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Distortion: - 3 % (barrel)
Vignetting: 0.45
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