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Canon 400D focus issue

Started Aug 15, 2017 | Discussions thread
brightcolours Forum Pro • Posts: 15,885
Re: Canon 400D focus issue
1

spacebiscuit wrote:

When I try to focus the lens makes the sound it usually would when focusing but it doesn't beep as it would usually when it has focused. Instead in sounds like the lens is reversing back or further trying to focus again. The lens can be heard making small adjustments without ever locking on.

Cleaning the contacts has no use at all, clearly they work as the lens does something. The camera does not see when something is in focus that is the issue. So, like WilbaW suggests, probably there is so much dust on the optics of the AF module that it has trouble seeing when something is in focus. The AF module is situated on the bottom of the mirror box.

Put your camera in manual sensor cleaning mode, so the mirror stays up. Take off the lens, and with a blower (made for cleaning the camera) blow the dust from the optics of the AF module.

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