I just used my D800 for a wedding for the first time and occasionally it would not focus at all. I was at least 15 feet away. Center spot, single shot af with my 70-200mm vr2. Everything is out, I shut camera off and when it powers back up no change. The only thing that solves it was to fire off an out of focus image and then it would work 100%.
This happened at least 4 times during approx 200 images shot on the body. Any clues?
The only time I have had a similiar issue is when I have selected a very poor af target. Camera/lens kind of give up. I just turn the mf ring and point camera at a different target and all has been good.
Perhaps you pressed the AF-Lock button (if there is one). I've done that at times with my D3s. It doesn't take much of a press and the effect persists after the button is released.
tpsfoto wrote:
I just used my D800 for a wedding for the first time and occasionally it would not focus at all. I was at least 15 feet away. Center spot, single shot af with my 70-200mm vr2. Everything is out, I shut camera off and when it powers back up no change. The only thing that solves it was to fire off an out of focus image and then it would work 100%.
This happened at least 4 times during approx 200 images shot on the body. Any clues?
Thanks
Larry
Tpsfoto
Perhaps you've received a lemon. D800 and D4 share the same AF module, and they have never failed to lock on for me even once in AF-S or AF-C.
I know its been said many times, but cleaning the In Body contacts solved ALL my AF issues, cotton bud and eclipse fluid, you know its oily and dirty when you get a dirty bud. I was ready to send it to NPS, also had lockup on selector but that was human error as in-advertly pressed other button when holding camera. The other thing I noticed with lockup was if you tried to preview images as the camera was writing to card. Not nice when your working prime time at a wedding. When i think how long my old S2 would take, the D800 processing three times as much is a speed demon
The Old saying "measure twice cut once" for the D800 "clean twice shoot once" like at a wedding Happy shooting its a beautiful machine
I never use "single shot AF" so can't help ya there.
Happy shooting its a beautiful machine