View Full Version : 70-300mm focusing glitch

29th December 2010, 02:24 AM
For no apparent reason my 70-300mm has stopped focusing in both AF and M modes.

In AF mode it makes a ratcheting sound when trying to focus.

In M mode nothing occurs when rotating the focusing ring.

I should add that on one occasion the lens (on camera), on the seat of my car, was exposed to road dust.

I cleaned the contacts but to no avail.

Have you any suggestions before I send it off for repair?


29th December 2010, 08:20 AM
Sorry to say it sounds like a candidate for the menders. I presume the m/af switch on the lens itself is seated correctly?

29th December 2010, 08:47 AM
Stephen, thanks for responding.

Yes, the af/m switch was seated correctly and as you say, I think it's a job for the menders.

I'm particularly fond of the 70-300mm too.