The Summicron 2.0/90mm was introduced in 1957 and manufactured until 1979 without changing the optical formular.
During this construction period, however, the lens underwent various changes to the lens barrel. The version that was initially supplied with a removable lens hood was quickly replaced by the version with a built-in lens hood.
It was common for the early versions of this lens to be built with a screw-thread mount chassis and for the Leica M series to be provided with a factory-glued bayonet adapter.
The many detail changes to the version of the Summicron 2.0/90mm include the execution of the engraving of aperture numbers and setting index, the corrugation on the aperture and distance rings, the execution of the lens barrel with corrugated base, with two rings or later very smooth and of course the surface coating in silver satin chrome or black chrome. Very early black Summicron 2.0/90mm samples have a mix of black painted and chrome-plated components.
The Summicron-M39 2.0/90mm offered here is from year 1959 and is a genuine screw-thread mount lens!
Cosmetically, it has clear signs of wear on the lens mount.
Technically, the condition can be described as good. The lenses have an age-related fogging on the elements.
Total production: only 490 units in screw mount, 4430 in M-mount
Rarity Forecast: R8