Monthly Archives: January 2016

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

Focus hunting – on Canon 17-55 F2,8 IS


On this lens I have never seen this before – but the symptom was absolutely the same like on the 17-85 lenses, so I decided to “refurbish” the USM motor. At first, You have to take it out from the … Continue reading

Posted in 17-55 F2.8 IS, Canon lens, USM | Leave a comment

Replacing or repairing the shutter release button – 550d


The sick camera was a 550d. No second contact on the button (practically, You had to push it very hard). After disassembling, I have found out that this is a new type of button (new for me), one side a … Continue reading

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Canon G12 – front lens replacement


Yes, it is a compact. It was big a mistake to accept this work. After working a lot on it, now the front lens is changed (photos will follow). The only problem is, that as I see, the lens unit … Continue reading

Posted in General topics | 5 Comments