Author Archives: canonrepair

About canonrepair

Ruzsa János. Amatőr fotós, Canon DSLR váz. Amateur photographer. Canon DSLR user.

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

Old Canon 100-400 meeting the new chinese milling machine

Posted on 2022. November 14. by canonrepair

I have got an old Canon 100-400 – AF not working, one flex teared by the former technician. The biggest problem: the good guy destroyed the head of a screw, holding the USM motor – so I could not disassemble … Continue reading →

Posted in General topics | 2 Comments

The Mistery of the 70-200 F4 Aperture

Posted on 2022. October 9. by canonrepair

I have got a 70-200 F4, with a strange aperture problem: the aperture works, but not always. After disassembly I realized, thet the aperture ring on the part moves not perfectly smooth (by a screwdrivers tip). I disassebled completely. The … Continue reading →

Posted in General topics | 2 Comments

Gentle cleaning of a camera? The shoe mud brush!

Posted on 2022. April 25. by canonrepair

No, I am not joking. The 6d plus a Tamron 100-400 has fallen yesterday in mud. For now the mud hardened, and the best way to clean it, before opening the camera was to clean it approx 45 minutes (!) … Continue reading →

Posted in General topics | Tagged | 2 Comments

Recementing of the 28-70 foggy element

Posted on 2022. January 30. by canonrepair

The Canon 28-70 F2.8 has a special problem: after a while, one of the duplets inside gets foggy. The problem is the cementing, a bad glue or process. After you disasseble the element, you can glue it with a UV … Continue reading →

Posted in General topics | Tagged , , | 8 Comments

What is the pickled cucumber good for…

Posted on 2022. January 3. by canonrepair

…in the camera workshop?! Today I have to clean a Sigma 24-105 1:4 OS – inside/outside. (in fact, I hate Sigmas…). First problem: to disassemble the front lens, I have to screw out the plastic ring – which has no … Continue reading →

Posted in General topics | 6 Comments

USM refurbishing

Posted on 2020. November 29. by canonrepair

Cleaning of the optical encoder ring helps only the focus hunting cases.When the problem is with the usm ring, I refurbish them with degreasing, polishing both rings to get back the plane, shiny surfaces, then cleaning again, after which mounting … Continue reading →

Posted in General topics | 37 Comments

Eastern Egg in a 17-85 IS

Posted on 2020. November 7. by canonrepair

I had to replace the aperture cable – and I found the former one too, which the other service did not removed before mounting the new one. They dont like to disolder?!

Posted in General topics | Tagged | 2 Comments

70d rotating LCD + 80D donor

Posted on 2020. September 6. by canonrepair

I had to repair a faulty shutter in a 70d. (on the photo there is a mistake. It is a comparison between 40D and 70D curtain). As I did not have a new one, I searched for a good curtain … Continue reading →

Posted in General topics | Tagged , , | 7 Comments

Damaged screw

Posted on 2020. June 1. by canonrepair

Case You have to screw out a bolt with damaged head (after forcing a stucked screw with the screwdriver can happen to damage the PH00 slot), You have 2 possibilities: to cut a simple straight slot with a small grinding … Continue reading →

Posted in General topics | 5 Comments