Summarit-S 35 f/2.5 ASPH.

Material number

The lens for every situation

The Summarit-S 35 f/2.5 ASPH. (CS) (28 mm in 35 mm format) is ideal for landscape and architectural photography as well as for studio work. Systematically designed with maximum contrast performance at maximum aperture from infinity to its closest focusing distance, this unusually fast lens is predestined for use as a universal lens.

Its sophisticated design and construction almost completely eliminate optical errors such as distortion and chromatic aberration. The Summarit-S 35 f/2.5 ASPH. (CS) is also available with a built-in central shutter.

The highlights

For studio and architecture photography

  • Innovative central shutter for maximum design freedom when using additional light
  • For studio and architectural photography
  • Excellent imaging performance over the entire range and at all aperture settings
  • Extremely fast
  • Creative use of sharpness and blurring for the plastic extraction of motif details
  • Best image quality up to the edges due to aspherical optics
  • Weather- and dust-sealed lens

Technical Details

To reduce chromatic aberrations to an absolute minimum, five of the eleven lens elements are manufactured from glasses with anomalous partial dispersion of which three also display particularly low dispersion characteristics. Two elaborately manufactured aspherical surfaces ensure that effects like distortion are kept to an extraordinarily low level.

Rear-group focusing guarantees consistently outstanding imaging properties from infinity to the closest focusing distance.


Modulation Transfer Function

The MTF is indicated both at full aperture and at f/5.6 and f/8 at long taking distances (infinity).

Shown is the contrast in percentage for 5, 10, 20 and 40 lp/mm across the height of the 35mm 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.


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 27.04mm is the radial distance between the edge and the middle of the image field for the format 30mm×45mm.

The graph of the effective distortion illustrates the appearance of straight horizontal and vertical lines in the picture.

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

Technical data

Order no. 11064 | CS: 11050
Image angle (diagonal, horizontal, vertical) approx. 74° / 64° / 45°, corresponds to approx. 28mm focal length in 35mm format
Optical design  
Number of lenses/groups 11 / 9
Entrance pupil infinity: 84.77mm (in front of bayonet in incident light direction)
  close focus limit: 84.85mm (in front of bayonet in incident light direction)
Focusing range 0,55m to ∞
Distance setting  
Scales Combined meter/feet graduation
Smallest object field 334mm× 502mm
Largest reproduction ratio 1: 11.1
Setting / Function Electronically controlled diaphragm, set using setting/selection dial on camera, including half values
Lowest value 22
Bayonet Leica S bayonet
Filter mount/ Lens hood External bayonet for lens hood (included), internal thread for E72 filter, filter mount does not rotate
Dimensions and weight  
Length to bayonet mount approx. 122/ 156mm (without/with lens hood)
Largest diameter approx. 88 / 132mm (without/with lens hood)
Weight approx. 930 / 1080 g (without/with central shutter)
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Summarit-S 35 f/2.5 ASPH.

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