Leica APO-Summicron-M 75mm 2.0 ASPH User Manual
LEICA APO-SUMMICRON-M 75 mm f/2 ASPH.
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The compact high-performance telephoto lens
The new LEICA APO-SUMMICRON-M 75mm f/2 ASPH. extends the range of telephoto lenses in the Leica M system with a fast
high-performance model that is simultaneously extremely compact.
75mm - The universal portrait focal length
With its more natural perspective compared to a 90mm focal length, where depth is reproduced with less compression, it is ideally suited for many applications including reportage and portraits - particularly in smaller rooms. Its small dimensions result in not
only outstanding handling but also a Leica M viewfinder image that is almost completely free of shadowing, thus allowing totally
undisturbed viewing of the subject. Whether you are using full stop to deliberately "isolate" critical parts of the subject or working
in high-contrast available light - both very common in applications with these focal lengths - or stopping down for sharp reproduction of more extensive areas of the subject, the LEICA APO-SUMMICRON-M 75mm f/2 ASPH. is convincing in any situation: At full
stop, it offers excellent contrast reproduction, even for very fine structures. This performance can only be slightly improved by
stopping down. Another outstanding feature is the extremely low distortion of only 1%. The vignetting that is normal for fast lenses at their maximum opening - up to approx. 1 stop in the corners of the image here - is further reduced by stopping down: At
f/2.8, it is negligible, except for the extreme corners and at f/5.6 it is negligible even in the corners.
The use of state of the art coating technology and additional measures for dulling the inner parts of the mount also ensure a high
degree of freedom from reflection. The optical system comprises seven lens elements in five groups. As on the recently introduced Summilux 50mm ASPH., they are a new version of the double Gauß lens type, with the first three lens elements corresponding to the typical Gauß design. The elements behind the aperture are very similar to those on the Summilux 50mm ASPH. - apart
from the use of a single lens instead of one of the two cemented lens element groups.
To achieve the excellent imaging performance, glass with anomalous partial dispersion is used (no. 2/3). Lens element no. 2 is
made of a fluorite-type glass, while the glass used for lens element 3 can trace its origins back to the former Leitz glass laboratory. Lens element no. 4 has a pressed aspherical surface. To minimize monochromatic aberrations, as well as having an aspherical
shape the glass used is also highly refractive (no. 5/6).
LEICA APO-SUMMICRON-M 75 mm f/2 ASPH.
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Lens shape
Floating Element
Asphere
Optimum image quality at close and long range
To maintain the outstanding imaging performance even at the minimum range of 0.7m - the Summilux-M 75mm only achieves 1m
- as on the Summilux-M 50mm ASPH., a so-called floating element is used. This final lens element (no. 6/7) changes its position
relative to the rest of the optical system during focusing. While the fundamental technology is common in SLR lenses, to achieve
this in a compact M lens with its very limited space, the Leica designers had to develop a brand new, extremely precise adjusting
mechanism. Its use allows the benefits of this design to be utilized to the full, while at the same time guaranteeing the familiar
silky smooth and absolutely accurate focusing of the M lenses.
Quality down the finest detail
A feature that has now become a standard for Leica lenses has also been included on the new LEICA APO-SUMMICRON-M 75mm
f/2 ASPH.: The built-in lens hood, which protects against stray light and dirt, can be locked in its extended position to prevent it
accidentally being pushed back in.
Summary:
By utilizing every means available in lens technology today - an aspherical surface, glass with anomalous partial dispersion and a
high refractive index, a floating element including a brand new, high-precision adjusting mechanism, state of the art coating techniques and sophisticated measures to reduce internal reflection - we have created a lens that not only extends the Summicron-M
range but also sets new standards in this focal length class. In the group of four fast M telephoto lenses with focal lengths of 75
and 90mm, the new LEICA APO-SUMMICRON-M 75mm f/2 ASPH. represents an ideal combination of several properties: It combines optimum imaging quality with high speed and compact dimensions. In conjunction with its moderated telephoto perspective,
this makes it ideal for almost any application, and along with a wide-angle lens it forms a complete and versatile but still very
compact equipment set.
LEICA APO-SUMMICRON-M 75 mm f/2 ASPH.
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Engineering drawing
Technical Data
Angle of view (diagonal, horizontal, vertical)
Optical design
Distance setting
Diaphragm
Bayonet
Filter (type)
Lens hood
Dimensions and weight
32°, 27°, 18°
Number of elements / groups: 7/5
Focal length: 74.98 mm
Entrance pupil: 30.1 mm (related to the first lens surface in light direction)
Focusing range: 0.7 m to Infinity
Scale: combined meter/feet-increments
Smallest object field: 169 x 254 mm
Highest reproduction ratio: 1:7
Setting / Type: Preset, with click-stops, half values available
Smallest aperture: f/16
Leica M quick-change bayonet
Internal thread for screw-on filters size E49, non-rotating
Built-in, telescopic, lockable
Length: 66.8 mm
Largest diameter: 58 mm
Weight: approx. 430 g
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