https://theclassiccamera.com/product/zeiss-21mm-f4-5-biogon-for-contarex-with-leica-m-adapter/
Zeiss 21mm f4.5 Biogon For Contarex With Leica M Adapter - The Classic Camera
Mar 3, 2026 - Condition EXC + + Light signs of use Optics clean and clear S/N 2622354 Lens comes with -Yellow filter -Rear cap
https://phillipreeve.net/blog/review-carl-zeiss-contarex-planar-f50mm-12/
Review: Carl Zeiss Contarex Planar f=50mm 1:2 - phillipreeve.net
Jan 14, 2026 - A review of the classic Zeiss Contarex 50mm 1:2 on the modern 24 Megapixel Sony Alpha 7.
carl zeissreviewcontarexplanar