Leica SUMMICRON-T 23 mm f/2 ASPH. Instruction manual

Lens Leica Summicron-T 23 mm f/2 ASPH.
Order no. 11 0 81
Compatible cameras All Leica T models.
Field angle
(diagonal, horizontal,
vertical)
Approx. 64°, 53°, 35°, corresponding to around 35 mm focal length in 35 mm format.
Optical design Number of lenses/groups: 9/6.
Aspherical surfaces: 2.
Position of entrance pupil at infi nity: -22.7 mm.
Distance setting 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.
Aperture Setting/Function: Electronically controlled, adjustment using dial on camera, third values also available.
Lowest value: 16.
Bajonet fi tting Leica T quick-change bayonet with contact strip for Leica T models.
Filter mount/
Lens hood
External bayonet fi tting for lens hood (included), internal thread for E52 fi lters, fi lter mount does not rotate.
Finish Black anodized.
Dimensions and Weight 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
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As at July 2014
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Specifi cations are subject to change without notice
Leica Camera AG
I
Am Leitz-Park 5
I
35578 WETZLAR
I
GERMANY
I
Telephone [phone]
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Fax [phone]
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www.leica-camera.com
LEICA SUMMICRON-T 23 mm f/2 ASPH.
Technical data.
Illustration 1:1

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 [phone]
I
Fax [phone]
I
www.leica-camera.com
LEICA SUMMICRON-T 23 mm f/2 ASPH.
Illustration 1:1
ENGINEERING DRAWING
LENS SHAPE
ASPH.
Brennweite 23mm
ASPH

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 [phone]
I
Fax [phone]
I
www.leica-camera.com
LEICA SUMMICRON-T 23 mm f/2 ASPH.
MTF DIAGRAMS
Focal length 23 mm
Infinity Close focus distance
MTF GRAPHS
Brennweite 23mm
unendlich Nahbereich
0 3 6 9 12
Y'[mm]
0
20
40
60
80
100 [%] Blende 2.0
0 3 6 9 12
Y' [mm]
0
20
40
60
80
100 [%] Blende 5.6
0 3 6 9 12
Y'[mm]
0
20
40
60
80
100 [%] Blende 2.0
0 3 6 9 12
Y' [mm]
0
20
40
60
80
100 [%] Blende 5.6
Sagittal structures
Tangential structures
Aperture stop 2.0
Aperture stop 5.6
Aperture stop 2.0
Aperture stop 5.6
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.