Talk:F = 5 cm 1:2 Summicron I
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early collapsible Summicron 2/5cm no.1118016
from "Leica Lens Compendium" by E. Putts: - Summicron (I) 'collapsible', 1953, ELW design, starting ser. no. 920,000 (in Screw Mount) and 1,112,000 (in M mount)
- Summicron (II) Rigid and Dual Range (same formula), 1957, ELW design, starting ser. no. 1,400,000
- Summicron (III) '69', 1969, ELW design, starting ser. no. 2,269,000
- Summicron (IV) tabbed and later major mount change with built-in hood (but same optical formula), 1979, ELC design, starting ser. no. 2,909,101
