I have been attempting to use the AF-ON button instead of the shutter button for focusing. I went to the Custom Setting Menu at a5 for autofocus activation and pressed AF-ON only. Well, the camera focused with the AF-ON button, but when I took a shot and pressed the shutter button half way down everything went out of focus. I don't know what I did wrong. Do I have to set the auto focus to af priority as an additional custom change? Your help will be greatly appreciated. Thanks.
"Don't let the dog out. No matter what he tells you."
As RA Baker says you need to press the OK button having selected AF-on only, not the OK in the centre of the 4way selector. Master the idea of using the AF on button to focus and it gives you the advantage of 3 different modes. Set the selector in the lens mount to C and leave it there and you get 1. press and release to focus (single) 2. press and hold to get continuous focus 3. do nothing and get manual focus. It takes a bit of practice to get used to doing the two button presses to take the picture, but I have found it much better since I don't have to think about changing a fiddly switch to alter the type of focus available. the best advice, as with all things is "try it" if you find you can't get on with it or it is not for you, nothing lost - the beauty of digital, it doesn't cost to experiment, no "wasted" film exposures, just deleted files.
Either, depending on what or how you are shooting. You only need to press the AF-On button when you want to focus. As soon as you take your finger off the AF-ON button the camera no longer adjusts focus. The shutter button works as normal, except it no longer focuses. That's the only change.
The cool thing about af-on and always being in af-c mode is that you can press-release the af-on button and get the equivalent of af-s focus mode or press-hold for continuous focus, without needing to change focus modes.
---------+---------+---------+---------+ Joseph K Seattle, WA, USA
Hi Guys thanks, for the help. I said to myself I now I can't be that bad! I know I shifted down to AF-ON only. But I'll doubled check. To my surprise - I hadn't. Well, I feel like - Elementary My Dear Watson. My mistake. Thanks again. Richard and Marsmail you are right on the money.
>The cool thing about af-on and always being in af-c mode is >that you can press-release the af-on button and get the >equivalent of af-s focus mode or press-hold for continuous >focus, without needing to change focus modes. > >---------+---------+---------+---------+ >Joseph K >Seattle, WA, USA > >D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II, 50mm >f/1.4 D, >17-55mm f/2.8 DX, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX >
And, provided you have an AF-S lens with A/M, you get the third Manual focus option - don't touch the AF-ON button, just focus using the lens' focus ring. That makes 3 focus modes with just the one button. Nice, I say.
Jake's post makes me beg the ? is there that much difference between the D300 and the D200 regarding the AF button . I have a D200 and I put A5 on and with a nikkor 24-120 3.5-5.6 D lens find that I have to go to A6 in order to turn off the Shutter focus .Also I am not able to manual focus . Could it be the lens body combination ? C'mon Joseph K and Chris I notice thet you both have a D200 . I'm sure others are able to advise as well .
1. On the D200 Custom Setting a6 is the correct menu item to set the camera to use the AF-On button only (or to set using both). Custom Setting a5 is the "Lock On" setting which deals with how the autofocus system reacts when something temporarily comes between the camera and a previously focused subject - it has nothing to do with the use of the AF-On button.
2. As far as I know, with a "D" lens you cannot manually focus unless you first disconnect the lens from the camera's AF system by changing the AF selector switch to "M." (There might be some D lenses that have an AF-Manual switch, but I've never seen one.) An AF or AF-D lens uses a mechanical connection to a motor in the camera body to operate the lens focus (often referred to as a "screwdriver drive"). An AF-S lens uses a motor in the lens itself to move the focus mechanism based on electrical signals from the camera. With an AF or AF-D lens you must disconnect the mechanical focus drive from the body so that you can manually focus. If you force the lens focus ring with the mechanical AF drive connected you can damage the lens, the camera, or both. With an AF-S lens it can be set to allow both AF or Manual operation. In this case, the lens recognizes when you turn the focus ring manually and ignores the electrical signals from the camera's AF system (at least until you release and then press again the AF-On button, or the shutter release if the camera is set to focus with the shutter release). So your question "Could it be the lens/body combination" is correct. As far as I know only AF-S lenses can be manually focused while the AF system is still engaged. ...or manual focus lenses, of course.