SHEET, FOCUS SCALE

Canon YB2-1189-000 focus scale sheet is a replacement part listed for the Canon EF 50 mm 1:1.2L USM lens. It is identified in Canon’s parts catalog as a sheet for the focus scale, making its role clear within that lens’s parts assembly.

The catalog specifies one sheet under this part number. This is a specific component for the named lens model, rather than a general-purpose camera accessory.