Author Archives: canonrepair

About canonrepair

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

Optical alignment


Cementing a Doublet: Opto-Alignment Technology, Inc. https://www.youtube.com/watch?v=cl6K-EXPILo   SmartAlign for lens alignment and assembly processes https://www.youtube.com/watch?v=D6KDGPw4-y8   Canon EF Lens Plant – Lens Assembly Process https://www.youtube.com/watch?v=4Oyud3EA9kE   Lens Handler Operations https://www.youtube.com/watch?v=_eHnrxYyb5k Advertisements

Posted in lens | Leave a comment

The mystery of NO FOCAL LENGTH on flash


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

Canon 5d MkII – error code 20 : shutter…


… or not the shutter?!? One of my customers has a 5d MkII. Time to time the camera stopped working with error code 30 after shooting. This is a general error code: “ Err 30Description: A malfunction with the shutter … Continue reading

Posted in 5d2, Canon camera, shutter | 2 Comments

Solvent for the cemented lens (not with canada balsam)


Case You want to dismantle a glued (cemented) lens, try to use this: 70% dichlor-methane https://en.wikipedia.org/wiki/Dichloromethane 20% methanol and 10% ammonia solution (I think 40%). Be carefull, dont swallow them, they all are dangerous.. After ca 1-2 days of soaking, you … Continue reading

Posted in General topics | 2 Comments

Canon 40dcmos – with no Bayer-filter!


After long trials yesterday I managed to eliminate the complete Bayer-mask from a Canon 40d sensor. No scratches, no damage – just a beautiful golden mirror. Not very simple – and definitely NOT only by scratching it with a piece … Continue reading

Posted in General topics | 5 Comments

Canon 7d – ERR20 – again and again


This 7d has been repaired a few months ago with an ERR20 error code after each shooting. ERR20 could mean many different problems, here is he internal ode: Interesting is, that, the internal error 215 is Mirror position problem, as … Continue reading

Posted in 7d, Canon camera | Leave a comment

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 | 10 Comments