Last updated (31 August’10):
– Review by Dfarkas
The Leica SUMMARIT-S 70mm F/2.5 ASPH features 70mm at focal length with maximum aperture of f/2.5. The lens construction has 8 elements in 6 groups and has diagonal angle of view at 42 degrees. Closest focusing distance at 0.5 m and has a filter size of 82mm. The Leica SUMMARIT-S 70mm F/2.5 ASPH lens weighs 740g and it measures 90mm in diameter and 93mm long.
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Leica SUMMARIT-S 70mm F/2.5 ASPH Reviews
Dfarkas.blogspot.com reviews the Leica SUMMARIT-S 70mm F/2.5 ASPH and writes;
“This lens is quite crisp wide-open at f/2.5. It even produces some decent bokeh as well. This is not a “typical” medium format wide-angle offering that must be stopped down to f/11 and beyond just to get some corner-to-corner sharpness. Considering the angle of view, this is impressive. the lack of distortion comes courtesy of cutting-edge optical design, not post-processing lens corrections. At infinity the 35mm has just -1.2% distortion and -1.8% at close-focus of 0.55m.”
Leica SUMMARIT-S 70mm F/2.5 ASPH User Reviews
Leica SUMMARIT-S 70mm F/2.5 ASPH Sample Photos
– Leica SUMMARIT-S 70mm F/2.5 ASPH Sample Photos @ Flickr.com
Leica SUMMARIT-S 70mm F/2.5 ASPH Specifications
The highest priority during development of the Leica S lenses was image quality. Their sophisticated design features special grades of glass and aspherical surfaces rarely found in optics of this size. In addition, lenses manufactured to extremely narrow tolerances, with each lens centered by hand, guarantees superior quality and optical performance. The maximum performance of each lens is available even at full aperture setting, or when shooting from a distance or capturing close-up images. Vignetting, distortion and chromatic aberrations have been reduced to the point of imperceptibility, eliminating the need for quality-degrading image corrections and simplifying digital post-processing considerably. The newly developed S-bayonet mount ensures rapid and precise digital exchange of data and commands between the camera and lens. Precise, high-speed autofocus The autofocus developed by Leica for the S2 is based on a centrally positioned cross-hair sensor for high precision focusing. Each S lens has its own Leica-designed microprocessor for precise autofocus and iris diaphragm control. The integrated focusing drive is a proprietary Leica design that features silent gearing. All S lenses have a generous focus ring with just the right amount of drag, letting the photographer override the autofocus at any time.