My D4s with the 70-200f2.8 has intermittently just started to have auto focus issues. The lens is 3 years old and performed flawlessly. The camera about 1 year old and also been a stellar performer.
The problem arises when in continuous focus mode (eg tracking a moving object). It starts to play up after this focus mode has been worked hard. Then, no matter what I do (remove battery, remove lens and put it back on again, try other focus modes etc) the big rig refuses to focus. I can manually focus the lens, no problems. Pull it out the next day and all is fine?!?!?! that is until I start using continuous focus mode hard again - very frustrating!
I will be trying (when it arrives) a good clean of the CPU contacts using Camera Check Points "DeoxIT"
I have the latest Firmware updates.
Is this a lens or camera issue - or both???
I would be very interested to know if anyone else has experienced this and what they did about it.
Thanks in advance...