Summicron M 35 / 2 0 ASPH - Lens LEICA - Free user manual and instructions

Product Type	Interchangeable lens for Leica M-mount rangefinder cameras
Model	Summicron M 35/2.0 ASPH.
Focal Length	35.3 mm
Maximum Aperture	f/2.0
Minimum Aperture	f/16
Optical Construction	7 elements in 5 groups, with aspherical element
Angle of View (diagonal/horizontal/vertical)	63°, 54°, 38°
Focusing Range	0.7 m to infinity
Highest Reproduction Ratio	1:17.5
Diaphragm	Manual, with click stops (including half values)
Bayonet	Leica M quick-change bayonet
Filter Thread	E 39 (39 mm screw-in)
Lens Hood	Separate, clip-on type (included)
Dimensions (Length × Diameter)	34.5 mm × 53 mm
Weight	255 g (black anodized) / 340 g (silver chrome finish)
Distortion	Virtually perfect absence of distortion (max 1% at edges)
Supplied Accessories	Lens hood, front and rear caps
Maintenance	Clean with soft, lint-free cloth; store in dry place; avoid touching glass
Repairability	Service by authorized Leica centers; spare parts available for professional repair

Frequently Asked Questions - Summicron M 35 / 2 0 ASPH LEICA

Is the Leica Summicron M 35/2.0 ASPH compatible with all Leica M cameras?

Yes, it features a Leica M quick-change bayonet and is compatible with all Leica M-mount rangefinder cameras.

What filter size does this lens use?

It uses a 39 mm screw-in filter (E 39). Make sure to use filters designed for this thread size.

Does the lens come with a hood?

Yes, a separate clip-on lens hood is included in the box.

How do I clean the lens safely?

Use a blower to remove dust, then a soft microfiber cloth with lens cleaning solution if needed. Avoid touching the glass directly.

What is the minimum focusing distance?

The minimum focusing distance is 0.7 meters (2.3 feet).

Is the lens weather-sealed?

No, the Summicron M 35/2.0 ASPH is not weather-sealed. Avoid exposure to rain or extreme humidity.

What are the best apertures for sharpness?

The lens is already excellent at f/2.0, but optimal sharpness and contrast are achieved around f/4 to f/5.6.

Can I use this lens for digital Leica M cameras?

Yes, it works perfectly on both film and digital Leica M cameras. It is designed for full-frame sensors.

What is the weight difference between black and silver versions?

The black anodized version weighs approximately 255 g, while the silver chrome version is heavier at about 340 g.

Where can I get the lens serviced?

Repairs and servicing should be done by authorized Leica service centers to maintain optical performance.

USER MANUAL Summicron M 35 / 2 0 ASPH LEICA

Excellent sharpness, high contrast and a superb resolving power over the entire focusing range are evident at full aperture. With its aperture stopped down modestly to f/4, this versatile lens delivers a maximum of resolving power and contrast. It is all the more impressive because of its virtually perfect absence of distortion. That makes it a world-class lens among fast wide-angle lenses. In spite of its high speed and its superb imaging performance, it is surprisingly small. Every Leica M camera fitted with this lens becomes a highly compact and elegant unit.

Lens shape

Engineering drawing

Technical Data
Angle of view (diagonal, horizontal, vertical)	63°, 54°, 38°
Optical design	Number of elements / groups: 7 / 5Focal length: 35.3 mmEntrance pupil: 10 mm (related to the first lens surface in light direction)Focusing range: 0.7 m to Infinity
Distance setting	Scale: combined meter/feet-incrementsSmallest object field: 419 mm x 627 mmHighest reproduction ratio: 1:17.5
Diaphragm	Setting / Type: with clickstops (including half values), manual diaphragmSmallest aperture: f/16
Bayonet	Leica M quick-change bayonet
Filter (type)	internal thread for screw-in type filters E 39
Lens hood	separate, clip-on type
Dimensions and weight	Length: 34.5 mmLargest diameter: 53 mmWeight: approx. 255 g / 340 g (black anodized- / silver chrome finish)

MTF graphs

The MTF is indicated both at full aperture and at f/5.6 at long taking distances (infinity). 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.

sagittal structures tangential structures

Distortion

Vignetting

Distortion is the deviation of the real image height (in the picture) from the ideal image height. The relative distortion is the percentage deviation. The ideal image height results from the object height and the magnification. The image height of 21.6mm is the radial distance between the edge and the middle of the image field for the format 24mm x 36mm. The graph of the effective distortion illustrates the appearance of straight horizontal and vertical lines in the picture.

Vignetting is a continuous decrease of the illumination to the edges of the image field. The graph shows the percentage lost of illumination over the image height. 100% means no vignetting.

sagittal structures tangential structures

Depth of field table

		Aperture Stop							Magnification
		2,0	2,8	4	5,6	8	11	16
Distance Setting [m]	0,7A	0,678A-A0,723A0,670A-A0,733A0,658	A-A0,748A0,643A-	A0,770A0,621A-A0	,804A0,596A-A0,8	52A0,559A-A0,948A	1/17,4
	0,8A	0,771A-A0,831A0,760A-A0,844A0,745	A-A0,865A0,725A-	A0,894A0,697A-A0	,942A0,665A-A1,0	10A0,619A-A1,151A	1/20,3
	1A0	,954A-A1,051A0,937A-A1,072A0,913	A-A1,107A0,882A-	A1,156A0,840A-A1	,240A0,793A-A1,36	5A0,727A-A1,642A	1/25,9
	1,2A	1,133A-A1,275A1,109A-A1,307A1,075	A-A1,360A1,032A-	A1,437A0,974A-A1	,571A0,911A-A1,7	81A0,822A-A2,296A	1/31,6
	1,5A	1,396A-A1,622A1,359A-A1,675A1,307	A-A1,764A1,243A-	A1,898A1,159A-A2	,144A1,069A-A2,5	63A0,947A-A3,816A	1/40,1
	2A	,816A-A2,226A1,753A-A2,330A1,666	A-A2,508A1,562A-	A2,794A1,429A-A3	374A1,293A-A4,56	7A1,116A-A11,27A	1/54,3
	3A2	,600A-A3,549A2,470A-A3,826A2,297	A-A4,341A2,102A-	A5,294A1,865A-A7	912A1,636A-A20,9	5A1,360A-A∞A1/82	6
	5A3	,969A-A6,766A3,671A-A7,867A3,297	A-A10,45A2,904A-	A18,62A2,466A-A∞	A2,076A-A∞A1,647	A-A∞A1/139
	10A6	,560A-A21,14A5,778A-A37,84A4,896	A-A∞A4,071A-A∞A	3,252A-A∞A2,602A	-A∞A1,957A-A∞A1	1/281
	∞A	18,90A-A∞A13,56A-A∞A9,505A-A∞A6	802A-A∞A4,775A-	A∞A3,485A-A∞A2,4	11A-A∞A1/∞