LEICA SUMMICRON-T 23 mm f/2 ASPH.
Technical data.
Illustration 1:1
Lens
Order no.
Compatible cameras
Field angle
(diagonal, horizontal, vertical)
Optical design
Leica Summicron-T 23 mm f/2 ASPH.
11 081
All Leica T models.
Approx. 64°, 53°, 35°, corresponding to around 35 mm focal length in 35 mm format.
Distance setting
Aperture
Bajonet fi tting
Filter mount/
Lens hood
Finish
Dimensions and Weight
Number of lenses/groups: 9/6.
Aspherical surfaces: 2.
Position of entrance pupil at infi nity: -22.7 mm.
Setting/Function: Electronically controlled.
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.
Setting/Function: Electronically controlled, adjustment using dial on camera, third values also available.
Lowest value: 16.
Leica T quick-change bayonet with contact strip for Leica T models.
External bayonet fi tting for lens hood (included), internal thread for E52 fi lters, fi lter mount does not rotate.
Black anodized.
Length to bayonet mount: approx. 37/69 mm (without/with lens hood).
Largest diameter: approx. 63/73 mm (without/with lens hood).
Weight: approx. 154/186 g (without/with lens hood).
Page 1 of 3 I As at July 2014 I Specifi cations are subject to change without notice
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
LEICA SUMMICRON-T 23 mm f/2 ASPH.
ENGINEERING DRAWING
Illustration 1:1
LENS SHAPE
ASPH.
Page 2 of 3 I As at July 2014 I Specifi cations are subject to change without notice
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
LEICA SUMMICRON-T 23 mm f/2 ASPH.
100
[%]
80
60
40
20
0
0
MTF DIAGRAMS
Brennweite 23mm
Focal length 23 mm
unendlich Nahbereich
Infinity Close focus distance
100
[%]
80
60
40
20
0
0 3 6 9 12
Y'[mm]
100
[%]
80
60
40
20
0
0 3 6 9 12
Y'[mm]
3 6 9 12
Y' [mm]
100
[%]
80
60
40
20
0
0 3 6 9 12
Y' [mm]
Sagittal structures
Tangential structures
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.
Page 3 of 3 I As at July 2014 I Specifications are subject to change without notice
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
