The so-called dual-range Summicron 50mm was first introduced in 1956 by Leica and manufactured until 1968. It was very popular because it had a close focusing distance of only 48cm which was obtained with the removable viewfinder attachment and a specially made focusing mount. The standard version of this lens can only be focused to one meter.
The dual-range Summicron was only offered as a special version of the second optical computation of the Summicron 50mm. All following versions had as close focusing limit only 70cm.
Total production dual-range M 2/50: approx. 55.145 units
Rarity forecast: R6