DOCUMENTED REPAIR · HOSTOPHOTO

Aperture adjustment on an Asahi Super-Takumar 55mm f/2

The aperture ring can drift after years of use. This case note follows the adjustment of an Asahi Super-Takumar 55mm f/2.

This Super-Takumar arrived with an aperture setting that no longer matched the actual diaphragm position. The lens still looked clean, but the mechanical reference had shifted.The repair consists of opening the control side carefully, checking the click positions, realigning the ring and confirming that every aperture value closes to the expected position.On this type of lens, patience matters more than force. The mechanism is simple, but the tolerances are small and a rushed adjustment can make the aperture scale inaccurate.