Despite its wide range of focal lengths , the 28-70mm Vario-Elmar is light and compact. To keep the lens as compact as possible , the aperture is variable according to the focal length in use. At the shortest focal length of 28mm the largest aperture is f/3.5 and changes progressively to f/4.5 at the focal length of 70mm.
Specifications.
Lens Mount :LEICA R quick-change bayonet for LEICA R3 to LEICA R9 with mechanical, and, for LEICA R8/R9, additional electronic exposure control
Angular field : 76˚ to 34˚.
Number of elements: 11 in 8 groups.
Filter size: E60. Ø M60x0,75mm
Diaphragm : Automatic spring back diaphragm. Aperture priority with click stops , intermediate settings possible.
Smallest aperture : F22
Focusing range : ∞ to 0,5m
Smallest object field : 28mm focal length :336mm x 504mm. 70mm focal length : 144mm x 216mm.
Separate setting ring for focal length.
Bayonet mount : LEICA-R quick change bayonet.
Finish : Black .
Lens hood :provided
Lens cap diameter : 74.5mm
Length from bayonet flange : 84mm
Maximum diameter : 74.8mm
Weight :465gram