Category Archives: EF 100mm F2,8 USM

Broken aperture gear–EF 100mm F2,8 USM

This lens had a ERR99 problem – which, as we know, could be practically anything. Aperture didn’t worked.  I disassembled it, and I observed that the back lens element has broken collars in the barrel, so it was not possible … Continue reading

Posted in Canon lens, EF 100mm F2,8 USM | 4 Comments