Leica Elmarit-R 90mm F2 lens. 1cam. ( 1965)

Leica Elmarit-R 90mm F2 lens. 1cam. ( 1965)
Leica’s series of lenses for single lens reflex cameras are designated R-series lenses, and are generally identified by the addition of the letter-R- after the lens name. The Leica R mount is a three lug bayonet mount with a 47mm flange focal distance. Although the R lens bayonet has remained substantially unchanged since its introduction in 1964, the R lenses can be divided into 4 general categories: one-cam lenses , being the lenses manufactured concurrently with and intended for use on the original Leica-flex body; two cam lenses , being the lenses manufactured concurrently with and intended for use on the Leica-flex SL and SL2 models, as well as the original Leica-flex three cam lenses, being the lenses manufactured concurrently with and intended to use on the Leica R3 and later models only.
Specifications:
Lens type: tele / portrait lens.
Angle of view: 27 °
Variations: 1-cam, 2-cam, 3-cam,
Optica construction: 5 lenses in 4 groups.
F-stop range : f/2.8—f/22 in half stops.
Closest focusing distance : 70cm
Smallest object of field: 140x210mm
Diaphragm setting type: 6 blades.
Filter type : Series VII+ filtering 14161R
Accessories : Hood 12564.
Dimensions: 72x65mm
Weight : 500 gram