Leica Summarit-S 35/2.5 ASPH Lens

Leica Summarit-S 35/2.5 ASPH Lens

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.

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.

Features:

• Classical Wide Angle Lens
• Two Aspherical Lenses
• Superior Optical Performance
• Weather Sealed
• Precise Auto Focus & Exposure Control
• For Use With Leica S-Series Cameras
• Compact Design (3.5 x 4.8")