Hasselblad CF Style Focus Ring Converter For C 40mm 50mm 60mm 80mm 100mm Lenses
Zeiss C 40mm, 50mm, 60mm, 80mm and 100mm Lenses. For example, the 40mm has a button within the focus ring to access the full focus range and the 100mm has a slightly wider focus ring because of the size of the optics.