[Wilf1954]

Couple of things.... firstly... settings... is the camera looking for f2.8 and all it can get due to the lens is f4 in a low light situation... moving the camera may then change the light meter reading and f4 will do and it fires?

These shutters are electrical... so may have a dirty contact send it to Canon for cleaning. Not sure on the number of actuations, but the shutter button electrics may have failed or at least are on their way out making intermittent contact. Send it back to Canon! Try recycling the power, I have heard that on the older 30D that had similar issues, that seemed to be a fix even if temporary.

If you are in UK any where near Elstree, go to the Canon Repair Facility and Pro Centre and they will have a look at it generally there and then. They will be able to advise the issue, costs and down time. You can if you wanted to then leave it with them and they will send it back to you.. after you stumped up the cash! Otherwise your local Canon dealership...

I hope that has helped...

Good luck

Kind regards

Rolf

Hello Rolf thanks for your info, I have tried everything you said ,no good, I think I will have to send it for a good clean & service. By the way I'm in Cornwall,not near Elstree but have found a good camera service centre in Bodmin, not far from me, I think a service will do it good. Will let you know how I get on. Thanks again for your help. Graham