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LEICA SUMMICRON-T 23 mm f/2 ASPH.
Technical data.
Illustration 1:1
Lens Leica Summicron-T 23 mm f/2 ASPH.
Order no. 11 08 1
Compatible cameras All Leica T models.
Field angle
(diagonal, horizontal,
vertical)
Optical design Number of lenses/groups: 9/6.
Distance setting Setting/Function: Electronically controlled.
Aperture Setting/Function: Electronically controlled, adjustment using dial on camera, third values also available.
Bajonet fi tting Leica T quick-change bayonet with contact strip for Leica T models.
Filter mount/
Lens hood
Finish Black anodized.
Dimensions and Weight Length to bayonet mount: approx. 37/69 mm (without/with lens hood).
Approx. 64°, 53°, 35°, corresponding to around 35 mm focal length in 35 mm format.
Aspherical surfaces: 2.
Position of entrance pupil at infi nity: -22.7 mm.
Mode selectable using camera menu: Automatic (AF) or manual (M), in AF mode manual override possible at any times
with setting dial.
Focusing range: 0.35 m to
Smallest object fi eld/largest scale: approx. 295 x 196 mm/1:12.6.
Lowest value: 16.
External bayonet fi tting for lens hood (included), internal thread for E52 fi lters, fi lter mount does not rotate.
Largest diameter: approx. 63/73 mm (without/with lens hood).
Weight: approx. 154/186 g (without/with lens hood).
∞.
Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com
Page 1 of 3 I As at July 2014 I Specifi cations are subject to change without notice
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LEICA SUMMICRON-T 23 mm f/2 ASPH.
Brennweite 23mm
ENGINEERING DRAWING
Illustration 1:1
LENS SHAPE
ASPH.
Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com
Page 2 of 3 I As at July 2014 I Specifi cations are subject to change without notice
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LEICA SUMMICRON-T 23 mm f/2 ASPH.
Brennweite 23mm
unendlich Nahbereich
MTF DIAGRAMS
Focal length 23 mm
Infinity Close focus distance
Aperture stop 2.0
Blende 2.0
100
80
60
40
20
[%]
100
80
60
40
20
[%]
0
0 3 6 9 12
Aperture stop 5.6
Blende 5.6
100
80
[%]
Y'[mm]
0
0 3 6 9 12
[%]
100
80
Aperture stop 2.0
Blende 2.0
Aperture stop 5.6
Blende 5.6
Y'[mm]
60
40
20
0
0 3 6 9 12
MTF GRAPHS
The MTF is indicated both at full aperture and at f/5.6 for long distances
(infinity) and close focussing distance. Shown is the contrast in percentage
for 5, 10, 20 and 40 lp/mm across 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.
Y' [mm]
60
40
20
0
0 3 6 9 12
Y' [mm]
Sagittal structures
Tangential structures
Leica Camera AG I Am Leitz-Park 5 I 35578 WETZLAR I GERMANY I Telephone +49(0)6441-2080-0 I Fax +49(0)6441-2080-333 I www.leica-camera.com
Page 3 of 3 I As at July 2014 I Specifications are subject to change without notice
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