Leica Summarit-S 35mm f/2.5 ASPH. CS

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Leica Summarit-S 35mm f/2.5 ASPH. CS

Unlimited versatility

With an angle of view corresponding to that of a 28 mm lens in 35 mm format, the Leica Summarit-S 35 mm f/2.5ASPH. can be used as a universal wide-angle lens with characteristically dramatic perspectives. At the same time,its unusually fast initial aperture offers fascinating creative potential for the use of selective focusing to isolate subjects from their surroundings. The alternative CS version with a central shutter and a close focusing limit of only 55 cm (~1.8 ft), offers extreme versatility for a wide range of photographic needs.

The combination of a fast initial aperture and a wide angle of view are only possible by the investment of enormous effort in the design and construction of such a lens. And here, Leica employs the benefits of numerous years of experience gained in the production of lenses with aspherical surfaces, a feature very rarely found in such large diameter lenses. In the front group, a lens with an aspherical surface created in an immensely precise grinding and polishing process guarantees extremely low distortion, and a further aspherical surface is employed in the rear groups. Altogether, five of the eleven lenses arranged in nine groups are manufactured from glass with anomalous partial dispersion, and three are fluoride lenses with particularly low dispersion (color scattering) characteristics.Rear group focusing in this splash-proof and dust sealed lens ensures consistent imaging performance from infinity to the closest focusing distances and a constant length when focusing.

Thanks to this special construction, the image performance of the Summarit-S 35 mm f/2.5 ASPH., is exceptionally good wide open and can be improved only very slightly in the corners of images by stopping down. A vignetting value of just 1.4 stops, and distortion no greater than 1.7 %, even at its closest focusing limit, are imperceptible in practical use. The outcome of the enormous effort invested in the design and construction of this lens is a wide angle lens that allows photographers to fully exploit its creative opportunities without compromise.

This is the CS version of the lens, which has a central shutter, also known as a leaf shutter, built-in. The central shutter allows the S camera to sync with a flash unit at any shutter speed up to and including 1/1000th of a second. This provides the photographer with exceptional control when balancing ambient and strobe lighting.

The essentials:

  • Innovative central lock for maximum design freedom when using additional light
  • For studio and architectural photography
  • Excellent imaging performance over the entire distance range and in all f-stops
  • Best image quality to the edge through aspherical optics
  • Seal against dust and spray water
  • Made in Germany


The LEICA Camera Blog

  • Image angle:
    Approx. 74° / 64° / 45°(diagonal, horizontal, vertical), corresponds to Approx. 28 mm focal length in 35 mm format
  • Optical design
  • Number of lenses / groups:
    11 / 9
  • Position of entrance pupil:
    84,8 mm
  • Focusing range:
    0,55 m to 8
  • Scales:
    Combined meter/feet graduation
  • Smallest object field:
    334 mm × 502 mm
  • Largest reproduction ratio:
    1 : 11,1
  • Aperture:
    Electronically controlled diaphragm, set using setting/ selection dial on camera, including half values
  • Lowest value:
  • Central shutter:
    Built-in shutter mechanism range: 125 secs to 1/1000th of a second; Flash syn at all speeds
  • Bayonet:
    Leica S bayonet
  • Filter mount / Lens hood:
    External bayonet for lens hood (included), internal thread for E72 filter, filter mount does not rotate
  • Length to bayonet mount:
    Approx. 122 / 156 mm (without / with lens hood)
  • Largest diameter:
    Approx. 88 / 132 mm (without / with lens hood)
  • Weight:
    Approx. 930 / 1080 g (without / with central shutter)

Lens, lens cap S E82, lens back cover S, lens bag, lens hood

Limited Warranty:
Leica Camera AG (‘LEICA’) provides a one-year product limited warranty for this LEICA camera valid from the date of purchase from an authorized LEICA dealer, including the accessories contained in the original packaging, which are valid for two years.

Leica S

with Mark Mann