Category Archives: 17-55 F2.8 IS

AF problem? Adjust the zoom-brush!


A lot of used (and repaired) zoom lenses have autofocus problems, front focus or back focus. Case the lens has been disassembled before, the problem can be caused by the non-adjusted zoom-brush. What does the zoom-brush have to do with … Continue reading

Posted in 17-55 F2.8 IS, lens | 13 Comments

F-words repairing Canon lens


F like F…. FLEX. The f.cking flex. I had to repair a 17-55 with aperture problems. The lens started to close the aperture more and more at certain zoom values. Simple case, isn’t it? You have to change the flex. … Continue reading

Posted in 17-55 F2.8 IS, Canon lens, EF-S lens, test bench | 8 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 | 2 Comments