LEICA 11618 Summicron-M 28 F 2 Asph User Manual
- June 16, 2024
- Leica
Table of Contents
LEICA 11618 Summicron-M 28 F 2 Asph
LEICA SUMMICRON-M 28 f/2 ASPH.
Technical Data
- Lens Order Number: 11618
- View angle (diagonal/horizontal/vertical) Full-frame (24 x 36 mm)
- Lens system: 9 lenses/6 assemblies
- Number of aspherical surfaces: 1
- Position of the entrance pupil before the bayonet : 12.7 mm
- Focus range: Live View – 0.4 m to ∞, rangefinder – 0.7 m to ∞
- Focusing Scale: Combined scale meter (m)/foot (ft)
- Smallest object field: Full-frame – 272 x 408 mm
- Largest scale: 1:11.3
- Aperture Setting/Function : Click-stop diaphragm with half-increment lock settings
- Smallest aperture : f/16
- Number of diaphragm blades : 10
- Bayonet: Leica M bayonet with 6-bit encoding
- Filter thread: E46
- Lens hood: Extendable
- Dimensions: Approx. 55 mm (Length), Approx. 58 mm (Diameter)
- Weight: Approx. 275 g
Product Usage Instructions
Focusing
To focus the lens, adjust the focusing ring according to the distance scale
provided. For Live View shooting, the focus range is from 0.4 meters to
infinity. For rangefinder shooting, the focus range is from 0.7 meters to
infinity.
Aperture Setting
The lens has a click-stop diaphragm with half-increment lock settings. To
set the aperture, rotate the aperture ring to the desired f-stop value. The
smallest aperture available is f/16.
Attaching and Detaching the Lens
To attach the lens to your camera body, align the red dot on the lens with
the corresponding dot on the camera’s lens mount. Rotate the lens clockwise
until it clicks into place. To detach the lens, press the lens release button
on the camera body and rotate the lens counterclockwise.
Using the Lens Hood
The lens hood provided with the Leica Summicron-M 28 f/2 ASPH. is
extendable for convenience. To use the lens hood, simply extend it from the
collapsed position and attach it to the front of the lens. The lens hood helps
to reduce lens flare and improve image quality in bright lighting conditions.
Specifications
- Order Number: 11618
- View angle (diagonal/horizontal/vertical) Full-frame (24 x 36 mm)
- Lens system: 9 lenses/6 assemblies
- Number of aspherical surfaces: 1
- Position of the entrance pupil before the bayonet: 12.7 mm
- Focus range: Live View – 0.4 m to ∞, rangefinder – 0.7 m to ∞
- Focusing Scale: Combined scale meter (m)/foot (ft)
- Smallest object field: Full-frame – 272 x 408 mm
- Largest scale: 1:11.3
- Aperture Setting/Function: Click-stop diaphragm with half-increment lock settings
- Smallest aperture: f/16
- Number of diaphragm blades: 10
- Bayonet: Leica M bayonet with 6-bit encoding
- Filter thread: E46
- Lens hood: Extendable
- Dimensions: Approx. 55 mm (Length), Approx. 58 mm (Diameter)
- Weight: Approx. 275 g
Frequently Asked Questions (FAQ)
-
Q: What is the filter thread size of the lens?
A: The filter thread size of the Leica Summicron-M 28 f/2 ASPH. lens is E46. -
Q: How much does the lens weigh?
A: The lens weighs approximately 275 grams. -
Q: Can I use this lens with a Leica M camera?
A: Yes, the Leica Summicron-M 28 f/2 ASPH. lens is designed for use with Leica M cameras and features a Leica M bayonet. -
Q: What is the focus range of the lens?
A: The focus range of the lens is from 0.4 meters to infinity for Live View shooting and from 0.7 meters to infinity for rangefinder shooting. -
Q: Does the lens come with a lens hood?
A: Yes, the lens comes with an extendable lens hood that helps to reduce lens flare and improve image quality in bright lighting conditions.
LEICA SUMMICRON-M 28 f/2 ASPH
Technical Data
| Lens | Leica Summicron-M 28 f/2 ASPH. |
|---|---|
| Order Number | 11618 |
| View angle (diagonal/horizontal/vertical) Full-frame (24 x 36 mm) | 74°/65°/46° |
Lens system
Number of lenses/assemblies Number of aspherical surfaces
Position of the entrance pupil before the bayonet Focus range| 9/6
1
12.7 mm
Live View: 0.4 m to ∞, rangefinder: 0.7 m to ∞
Focusing
Scale
Smallest object field Largest scale| Combined scale meter (m)/foot (ft) Full-
frame: 272 x 408 mm 1:11.3
Aperture
Setting/Function Smallest aperture
Number of diaphragm blades| Click-stop diaphragm with half-increment lock
settings 16 10
Bayonet| Leica M bayonet with 6-bit encoding
Filter thread| E46
Lens hood| Extendable
Dimensions
Length Diameter| Approx. 55 mm
Approx. 58 mm
Weight| Approx. 275 g
TECHNICAL DRAWING
LENS CUT
MTF DIAGRAMS
MTF CURVES
The MTF is shown in each case for the max. aperture as well as for 2.8 and
5.6 for focus distances (infinity). The contrast is plotted in percentages for
5, 10, 20, 40 Lp/mm over the height of the format for tangential (dashed line)
and sagittal structures (continuous line) for white light. The plots for 5 and
10 Lp/mm offer an impression of the contrast behavior for coarser object
structures, while the 20 and 40 Lp/mm plots document the resolution capability
for fine and finest object structures.
DISTORTION
VIGNETTING
DISTORTION
Distortion is the deviation of the actual image height from the ideal image
height, whereby the ideal image height is calculated from the object height
and the reproduction scale. Relative distortion states the percentage
deviation of the actual to the ideal image height. The image height of 21.6 mm
is the radial instance between one corner of the image field and the middle of
the image field (image format 24 mm x 36 mm). The graph td of the effective
distortion illustrates the actual line and the curvature of horizontal and
vertical lines in the image horizon.
VIGNETTING
Vignetting is a continuous decrease of image brightness (irradiance) towards
the edges of the image (shading compensation, darkening of the image corners).
The graph shows the diminishing brightness in percent applied over the image
height. 100% means no vignetting.
Version date October 2023 I Subject to changes in design and production.
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