EF 70-300mm lens has stopped working. Any ideas on what the problmen might be?

[jrhoffman75]

Exactly what is happening/not working?

[ebiggs1]

A lot more info is needed.  If it won't AF, it is probably toast and is kaput.  Did you drop it or get it wet?

[kvbarkley]

Assuming he can see through it, it is either the focus, the IS or the aperture, all of those scream "Send me back to Canon!"

[cser]

This is me replying back to everyone who responded. THANK YOU! Nothing happened to it. It was in the bag and I had not used it for a while. It just doesn't work. It isn't the camera because other lenses work. It almost doesn't seem to be getting power - it will not focus - I say almost because sometimes it makes a little sound like it is "trying" to work. I cleaned the connections... not sure what else to do...

[jrhoffman75]

Does it have a MF/AF switch. Cycle the switch a few times. If you are in MF can you turn the focus ring?

[cser]

It does have the mf/af ring.  I will try it when I get home.  Thanks.

[cser]

I cycled the switch.  The ring does turn in MF but not easily...  Feels/sounds like something in there...kind of gritty

[jrhoffman75]

Most likely needs service then. But, it may be less expensive to replace the lens. Give Canon service a call and see if they have a flat rate repair fee or can ballpark you a repair cost. Then, go to the Canon eStore and check out refurbished lenses.

[Waddizzle]

Check out this thread.

http://community.usa.canon.com/t5/Lenses/Autofocus-not-working-18-55mm-lens/m-p/138114#U138114

Your lens just may have a similar issue.  If not, contact Canon service.  I agree, a new lens of the same type just be less inexpensive than a repair.  What does that say to you about the quality of the lens?