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Barry S Moore | all galleries >> All My Images >> EFS 17-85mm IS f4-5.6 Err 01 Err 99 > IMG_0161.JPG
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The aperture (power diaphram) is held with three screws and these small black cylinders. To remove the cylinders I used a small torx bit and rammed it inside,gently rotated and pulled them out.

Canon EOS 50D ,Canon EF-S 60mm f/2.8 Macro USM
1/180s f/11.0 at 60.0mm iso1600 full exif

other sizes: small medium original