Monthly Archives: December 2016

Glued screws – when the serviceman get’s angry


I have got a Sigma 300 mm F2,8 lens from a customer, which has some dirt in the inside. A lens element was dirty or some fungus on the surface. (As a supplementary information I was told, that on the … Continue reading

Posted in DIY, lens, tools | 1 Comment

7d flash overexposure – RTFM, RTFM, and again: RTFM


I repaired a 7d for somebody (a faulty rotary switch, and a general internal cleaning, with glueing the flying screw, which was of course on the side of the shutter motor), and after assembling it I checked the general functions … Continue reading

Posted in 40d, 7d, Canon camera, flash/strobe | Leave a comment

Melted canon 6d – or any DSLR exposed to sun


A customer has sent me an email with a strange problem: he has seen something blurred in the viewfinder of a 6d, after which he turned off the lens, and a burned smell came out. He has 2 similar 6d … Continue reading

Posted in 6d, Canon camera, melted | 6 Comments

Canon 7d – ERR20


After exposure, ERR20 – shooting is not possible message. This means some mechanical failure. Official Canon advice: “Err 20 Description: A malfunction with the mechanical mechanism has been detected. Resolution: Turn the power off, then remove and re-install the battery. … Continue reading

Posted in 7d, oxide, service softver SPT, short circuit | Leave a comment