Leica 11645 User Manual
LEICA SUMMARIT-M 75 mm f/2.5
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The LEICA SUMMARIT-M 1:2.5/75 mm is a new "short telephoto" lens that is significantly smaller and lighter than Summicron
lenses with the same focal length, but still offers the image quality that is the hallmark of Leica M lenses. Combined with the 35
mm Summarit-M, it makes up an ideal shooting outfit with a useful lens speed that opens up fascinating composition options for
Leica M photographers. The new 75 mm Summarit-M replaces the portrait focal lengths of 90 -100 mm for digital use. Its exceptionally compact design and performance bring a new level of flexibility to rangefinder photography.
Lens shape
LEICA SUMMARIT-M 75 mm f/2.5
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Technical Data
Angle of view(diagonal, horizontal, vertical)
Optical design
Distance setting
Aperture
Bayonet
Filter mount/Lens hood
Dimensions and weight
For 35 mm (24 x 36 mm) : 32°, 27°, 18°, for LEICA M8 (18 x 27 mm) : 24.4°, 20.4°, 13.7°,
corresponds to a focal length of approx. 100 mm with 35 mm-format
Number of lenses/groups: 6 / 4
Focal length: 75.0 mm
Position of entrance pupil: 29.9 mm (related to the first lens surface in light direction)
Focusing range: 0.9 to endless
Scales: Combined meter/feet graduation
Smallest object field/Largest reproduction ratio:
For 35 mm, approx. 238 x 357 mm /1:9.9;
for LEICA M8, approx. 178 x 268 mm /1:9.9
Setting/Function: Preset, with click-stops, half values available
Lowest value: 16
Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models
Non-rotating, internal thread for screw-on filters size E46, external thread with stop for lens hood,
protection ring for external thread included in delivery, lens hood available as accessory
Length: approx. 60.5 mm
Largest diameter: approx. 55 mm
Weight: approx. 345 g
Engineering drawing
LEICA SUMMARIT-M 75 mm f/2.5
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MTF graphs
The MTF is indicated both at full aperture and at
f/5.6 at long taking distances (infinity). Shown
is the contrast in percentage for 5, 10, 20 and
40 lp/mm accross the height of the 35 mm film
format, for tangential (dotted line) and sagittal
(solid line) structures, in white light. The 5 and
10 lp/mm will give an indication regarding the
contrast ratio for large object structures.The
20 and 40 lp/mm records the resolution of finer
and finest object structures.
tangential structures
sagittal structures
_ _ _ _ _ _ _ _
[%]
100
80
60
40
20
0
0 5 10 15 20
[%]
100
80
60
40
20
Aperture Stop 2.5
Y' [mm] = 21.0000
Aperture Stop 4.0
[%]
100
80
60
40
20
0
0 5 10 15 20
Aperture Stop 5.6
Y' [mm] = 21.0000
0
0 5 10 15 20
Y' [mm] = 21.0000
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