Certificate of Provenance & Condition
Authenticated by LensSeed
Contax / Yashica
Yashinon-DS
Authenticated
Condition assessment
BWeighted across
three axes
three axes
Optical5/5
Mechanical5/5
Cosmetic3/5
Certificate №LS-BADBB718987B
Serial20001533
MountM42
Focal length50mm
Max aperturef/1.7
Issued22 June 2026
Honest defect disclosure
DustMinimal
HazeNone
FungusNone
SeparationNone
Coating marksNone
Oil on bladesNone
Scan to verifyLS-BADBB718987Blensseed.com/cert
LensSeed
LensSeed · 20+ Year of Experience