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Pete Ganzel | all galleries >> Tinkering >> Dissassembly and Repair of the 58mm Rokkor Lenses > Iris Adjustment 0241.jpg
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Iris Adjustment 0241.jpg

Iris Adjustment 0241.jpg

The combination of these two adjustments provides almost a 2 stop alteration of the iris position in relation to the aperture ring.

Start by adjusting the sliding coupling on the left until the f/1.2 setting on the ring places the open aperture just past the field stop in the lens. The adjustment on the right is a max opening stop and can be moved if the ring doesn't center to the f/1.2 setting.

Fine adjustments can be made using sensitometry and a lens of known correct aperture setting on an evenly lit wall.

Konica-Minolta DiMAGE A2
1/30s f/8.0 at 50.8mm iso100 full exif

other sizes: small medium large original
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