Unknown I dont now the specific part name, but the thing that extends out that also has the lense on it wont extend when i push power. All i can do is acess my pictures, but when i flip it to take a picture it wont extend out, and the camera turns itself off. I already tried replacing batteries. Could someone help me?
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There are 2 Canon fittings, EF for all EOS cameras and EF-S for 'crop' cameras. The Canon extender does not fit crop cameras. Whichever make you look at, make sure it will fit the type of mount you have.
If you have not yet bought your lens of choice, Sigma are good and do their own extender compatible with their own lenses but not Canon's. This may be a good option for you
Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ...
Here's some things that you can do to try to correct it. They only seem to work for less than 50% of the lens errors, but if the camera is out of warranty, they're worth a try:
Apparently, the extender is designed to work only with specific lenses. B&H Camera has a chart available here showing which lenses it is compatible with. Note that even if the extender will fit on a specific lens, autofocus capability is not always possible. All the lenses listed are professional series ("L") lenses, and I don't see any 75-300 or 18-200 listed.
Some of these cameras that have a lens that extends use gears to extend the lens. The gears can strip or get clogged with fine debris and jam the lens. Usung good quality rechargable batteries NOT ALKALINE will usualy have the power to drive the lens.
Ask yourself, how many cycles do you have on the pack? could the pack be weak and not power the camera fully?
Have you tried pushing firmly in on the battery while you power it up? If the camera will not power on with the door open, try and fold a small trip of paper and sit it between the battery and the door. This might push in on the battery enough to better the connection and solve the issue.
If the battery is fine then you may have a lens problem. The lenses can be jammed easy, dropped or an impact when extended is all it takes.