Category Archives: Canon lens

Canon 70-200 F2.8 IS – the good old glass

Posted on 2023. February 5. by canonrepair

My customer has found it for a bargain price (no, in fact was not so cheap…) – but the lens has been dropped before. I had to disassemble it, repaired the USM motor (see: refurbishing a USM) – and after … Continue reading →

Posted in 70-200 F2.8 IS Mk I, lens, test bench | Tagged | Leave a comment

The mystery of NO FOCAL LENGTH on flash

Posted on 2018. February 19. by canonrepair

The customer has got a used Tamron 17-50 F2,8 lens, and realized that using with a Canon strobe, there is no change on the strobes display, it shows always 17mm focal length. I was sure that there has to be … Continue reading →

Posted in Canon lens, Tamron lens | 7 Comments

AF problem? Adjust the zoom-brush!

Posted on 2017. October 22. by canonrepair

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 | 17 Comments

24-105 F4 IS – damaged stabilizer

Posted on 2017. April 9. by canonrepair

A few weeks ago I repaired a used 24-105 for myself. I have purchased it in a box in thousand pieces for a bargain price. Everything was ok – excepting a strange noice from the stabilizer when switching on and … Continue reading →

Posted in 24-105 F4 IS, EF lens, EF-S lens | 18 Comments

F-words repairing Canon lens

Posted on 2017. January 8. by canonrepair

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

Canon 24-105 F4 broken flex – why exactly there?

Posted on 2016. July 9. by canonrepair

You have probably seen a lot of 24-105 lenses – the flex cable breaks after a certain time of using – and ALWAYS on the same place. And on that position always appears a tiny broken line in the middle … Continue reading →

Posted in 24-105 F4 IS, Canon lens | 8 Comments

Canon EOS – no communication with SOME lenses (70d)

Posted on 2016. February 13. by canonrepair

It was a Canon 70d – but as we have seen at the end, in fact could be any camera. The owner told me, that the camera can work with different EF (full frame) lenses, some Sigma lenses – but … Continue reading →

Posted in 70d, Canon camera, EF lens, EF-S lens | 2 Comments

Canon 70d not recognizing EF-S lens

Posted on 2016. February 8. by canonrepair

It was a relative new 70d, in good condition. Working well with Canon EF lenses, with Tamron lenses – but NOT with two different Canon EF-S. The lenses work well with other camera. Cleaned the contacts. Nothing. Trying to rotate … Continue reading →

Posted in 70d, Canon camera, EF lens, EF-S lens | 2 Comments

Broken aperture gear–EF 100mm F2,8 USM

Posted on 2016. January 30. by canonrepair

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

Posted on 2016. January 30. by canonrepair

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