Leica launched an entirely new series of compact M series lenses; the 35 mm, 50 mm, 75 mm and 90 mm Summarit-M, all with a maximum aperture of F2.5. An affordable range compatible with M8 digital rangefinder providing corresponding fields of view (rounded) of 47 mm, 67 mm, 100 mm and 120 mm respectively. Empowered with the renowned optical and mechanical excellence of Leica the four lenses have the most deemed focal lengths in the Leica M system:
LEICA SUMMARIT-M 35 mm f/2.5
LEICA SUMMARIT-M 50 mm f/2.5
LEICA SUMMARIT-M 75 mm f/2.5
LEICA SUMMARIT-M 90 mm f/2.5
With the maximum aperture of f/2.5 and the traditional spherical lens design gives this new series of lenses the same Leica quality and performance ratio.

via:Leica

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