Iris diaphragms from the standard programme V (with retaining ring)

Casing of metal, flat synthetic lever or round lever of metal. Synthetic turning ring, especially smooth running, resistant to wear; up to approx. 130°C permanent temperature stability, with short-term impact up to approx. 160°C.

N = Blades of burnished spring steel

temperature stability up to approx 250° Celsius

AR = Blades with antireflex coating

temperature stabilty up to approx 180° Celsius