SOURCE: Canon 400D with EF 100-400 Zoom lens
I wouldnt chance it but get a good heavy one with metal locks and such
I’m happy to assist further over the phone at https://www.6ya.com/expert/james_1cb31da1bc8c6102
SOURCE: Canon Rebel XTI Ef-S Lens stuck
Hello Pittsburgh! I lived there for 3 years! Dreadful city. :-)
Now, your lens must have a problem with the guide rails/pins. If you dropped it or bumped it, you might have broken/damaged those guide rails. Another reason might be sand/grit in the zoom mechanism.
You may try stripping the lens slowly and see if you can identify the problem. Most lenses are easy to disassemble, you start from the rear mount area, take off screws, and parts one by one, and be organized (i.e., take photos for every step and don't mix the screws).
Good luck.
K.
SOURCE: Why do I get Error 99 in my Canon EOS 350 D?
1. Turn off the camera.
2. Remove the lens, battery, and CF card.
3. Allow the camera to sit without power for approximately 20 minutes.
4. Insert a fully charged battery, and turn on the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If it does, then the camera should be
serviced. If it does not, then please proceed to the next set of steps:
1. Turn off the camera.
2. Insert the CF card.
3. Turn on the camera.
4. Format the CF card in the camera.
5. Depress the shutter button as you would to take a picture.
Does the “ERR 99′ message appear? If so, then the CF card is the most
likely source of the issue. Try using a different card.
If the message does not appear, please complete the following steps:
1. Turn off the camera.
2. Clean the lens contacts by gently rubbing them with a pencil eraser
or soft cloth. Be careful that you do not let any debris fall into the
camera body.
3. Reattach your lens.
4. Turn on the camera.
5. Depress the shutter button as you would to take a picture.
If the “ERR 99′ message only appears when one particular lens is
attached, then that lens should be examined by a service technician.
If you see the “ERR 99′ with a different Canon lens attached, then the
camera should be serviced.
SOURCE: Water inside the lens (Canon EF-S 17-85mm F4.5-f5.6 lens)
if it is only fogged you can blow hot air on the lens while fully zoomed in and after the water has evaporated, zoom out to compress the moist air out. do this several times.
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