<p>Hi there. I'm hoping someone may be able to help me here.</p> <p>I have a new ( 3 month old) EOS 650D, which was purchased with the standard 18-55mm lens plus a 75-300mm telephotos lens. Until yesterday, all was fine. Now the 75-300mm lens will not focus properly. If I aim at the subject, say a wild bird sat on a fence post, the camera just can't decide what to focus on. The lend whirrs in and out, I can't press the shutter button halfway for an AF lock, and can't take a photograph as the lens will not focus. Occasionally, after whirring for around 10 seconds, the lens will eventually focus, I get the AF lock, and I can take the photo but this doesn't always occur. Even on a shaprly contrasting subject, say a red brick house against a blue sky, the lens will not focus.<br> I've had a couple of error messages along the lines of " there is a bad contact between the camera body and lens" or something like that, so I have cleaned both sets of contacts with alcohol and a low lint cloth but it makes no difference. The lens is set to AF rather than MF, and the camera battery is fully charged.</p> <p>Any ideas anyone please? Many thanks</p>
