Special Features - Leica SUMMARON-M 1:5,6/28mm Instructions Manual

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SPECIAL FEATURES

This Leica Summaron 1:5,6/28mm is a replica of the model originally intro-
duced in 1955. With its 6 lens elements arranged strictly symmetrically around
the aperture in 4 groups, it has the same optical design. Its extremely compact
mechanical construction also corresponds to the original. Unlike this, how-
ever, the current model is equipped with the M bayonet including 6 bit code.
Furthermore, various external details have been adapted to the appearance of
the current M lenses, for example the shape of the focus unlock button, the
diameter of the aperture ring and the knurling.
Even when fully open, the lens is characterized by high-contrast rendering in
large areas of the field of view. Stopping down to 11 greatly improves the imag-
ing performance in the corners of the picture. Although stopping down further
enhances the picture corners even more, this is at the expense of the overall
contrast, i.e. the imaging performance is more even overall. When the aperture
is open, vignetting is max., i.e. in the image corners, appeox. 2.5 aperture stag-
es. By stopping down to 8 vignetting can be reduced to approx. 1.8 aperture
stages. Distortion is negligible.
Summary: Due to its imaging properties and its focal length, the new edition
of the Leica Summaron 1:5,6/28mm is suitable for quick and discreet photog-
raphy, in other words spontaneous snapshots. Its extremely small dimensions
together with the camera make an extremely manageable unit that is easy to
carry.
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