The Autofocus function stops working intermittently on my D300s. It works ok for a few shots then shuts down. If I leave the camera off for awhile it works ok again for maybe 20 shots, then stops again. I use the AF-ON button for autofocus. I had taken about 300 shots immediately before the problem started & wonder if overheating might be an issue. As I am shooting wildlife I find manual focus a bit too challenging for moving targets. I am using a 300mm F/4D with 1.4 TC, but doubt that would be an issue. Any advice would be appreciated....Scotty.
Have you tried cycling the AF mode switch back and fourth a few times? You should also try cleaning the electrical contacts on the camera body, both sides of the TC and the lens. Make sure all of the contacts are projecting out the same distance. They are spring loaded and can get jammed in. You also might try rotating the lens and TC back and fourth to make sure it is not an alignment issue with the electrical contacts. Good Luck and Enjoy your Nikons!
Like Marty I am going to say look very closely at the lens & mount contacts. I had this same problem with my D300 and 70-200 early on. Once cleaned and 140,000 shots later still no problems. DeoxIT is the product I used to clean with. I got it at Radio Shack.
>Hi Ian, > >Like Marty I am going to say look very closely at the lens >& mount contacts. I had this same problem with my D300 and >70-200 early on. Once cleaned and 140,000 shots later still no >problems. DeoxIT is the product I used to clean with. I got it >at Radio Shack.
Thanks y'all. had same prob with my D300. cleaning the contacts fixed it.