Leica APO-Summicron-SL 90 f/2 ASPH was announced alongside a 75mm f/2 lens, Leica SL - its full frame digital camera. The 90mm is the ideal focal length for portraits, especially given its wide maximum aperture,Leica promise of “maximum aperture is a usable aperture” is applied to these lenses too - Leica promises that even wide open, the lens is capable of producing sharp images.. 
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