I sent my canon 40D for repairs and found out that it was the Tamron 11-18mm lense that was broken. They did not tell me what was wrong with it but said not to use it. When then lense was attached, I was not able to depress the "shoot" button and get the camera to focus. Nothing would happen. After a few weeks, after puttin it on manual to be able to take the picture, the camera then said there was a problem with the contacts or something to that extent. Any suggestions?

SOURCE: Nikon D40x AF-S Nikkor 18-55 mm 1:3.5-5.6 GII ED Lense Trouble

I've found the same thing with my D40x and the 18-55mm AF-S lens. I took a really close look at it and found that the mount on the lens is badly worn on all three of the bayonet tangs and one is cracked at the base. What happens in my case is that the lens has movement when mounted on the camera - just enough to stop the contacts from mating properly. Hence, no photos. Am taking it to Nikon to get it fixed. I suggest if this is your problem, that you take it to the repair man.

SOURCE: Tamron 200-500mm lens on Canon 40D ... when I put

Try gently cleaning the electronic contacts on the lens's mount with an eraser. This will remove any mild oxidation on the contacts. If this doesn't resolve the problem, then contact Tamron and ask if there are any issues using this particular lens with a Canon 40D.

SOURCE: tamron 35-105 f2.8 sp lens, aperture often

lens flexible pcb broken change it