Leica 11646 User Manual
LEICA SUMMARIT-M 90 mm f/2.5
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The LEICA SUMMARIT-M 90 mm f/2.5 is a versatile telephoto lens that rounds off the new lens speed class of Summarit-M lenses. Despite being much more handy and lighter than the comparable 90 mm Summicron lens, it offers outstanding optical and
mechanical quality. Even at full aperture, this lens demonstrates excellent imaging capability with outstanding contrast over the
entire image field. A slight reduction in quality can only be seen in the corners - which are not even captured by the slightly smaller format of the digital LEICA M8 - but even this can be improved significantly by stopping down to f/5.6.
Lens shape
LEICA SUMMARIT-M 90 mm f/2.5
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Engineering drawing
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) : 27°, 22,6°, 15,2°, for LEICA M8 (18 x 27 mm): 20,4°, 17.1°, 11.4°,
corresponds to a focal length of approx. 120 mm with 35 mm-format
Number of lenses/groups: 5 / 4
Focal length: 91.0 mm
Position of entrance pupil: 54,8 mm (related to the first lens surface in light direction)
Focusing range: 1,0 m to endless
Scales: Combined meter/feet graduation
Smallest object field/Largest reproduction ratio:
For 35 mm, approx. 213 x 320 mm/1:8.9;
for LEICA M8, approx. 160 x 240 mm/1:8.9
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 filterssize E46, external thread for lens hood, protection
ring for external thread included in delivery, lens hood available as accessory
Length: approx. 66.5 mm
Largest diameter: approx. 55 mm
Weight: approx. 360g
LEICA SUMMARIT-M 90 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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