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Nikon DSLR Cameras
D3500
How to lock focus on D3500?
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<blockquote data-quote="nickt" data-source="post: 726011" data-attributes="member: 4923"><p>Short answer, either hold it or release it. The beauty of the technique is you hold the button for continuous focus or you release it for a simulated af-s mode. The long answer, I have to talk about a few things. There are two focus servo modes, af-s and af-c (nobody uses af-a). Af-c is continuous mode. Holding the shutter half way keeps on trying to focus. Its good for action. Its not good for focusing and recomposing. Won't work for that. Af-s is single focus. The camera grabs focus and does not try again as long as you hold the shutter half way. Its good for stationary shots especially if you need to recompose. Its not good for action. So that is the 'problem'. BBF is a solution. It in effect makes both modes available. The text book way of using the bbf technique is to set the back button to af-on. The camera is also placed in af-c mode, continuous auto focus. Most of our models (not d3000 series) have a menu setting that further defines af-c. It can be focus priority or release priority. Focus priority means the camera must see focus before the shutter will fire. Release priority means the shutter will fire regardless of focus. BBF is used with af-c, release priority. The shutter will fire no matter what. </p><p></p><p>So with the back button set to af-on and af-c mode-release priority you are ready to go. When you press the button, you get continuous focus. So you can track moving subjects or a stationary subject too. At any time you can release the button and focusing stops. You can then point the camera somewhere else (recompose) and take the shot. Usually its used with a single focus point for more precision. So you could hold the button down and track something. Or you can point at your friend's eye, hit the back button once to focus, then release it. You can now recompose. Or you can focus on the bird feeder, then release the button. You are now pre-focused on the bird feeder for when the bird comes back. Or you can focus on a very distant tree line. Release the button and you are now prefocused at infinity and ready for a completely different infinity shot. I am not sure the d3500 can do this. The test would be set it up the back button along with af-c mode and single point focus. Focus on something and release the back button. Recompose without pushing the back button again and see if the shutter will fire. Even with your hand in front of the lens it should still fire. I think it may not fire the shutter on the d3500 because the focus point no longer sees focus.</p><p></p><p>Now all this doesn't really solve your original question. But being able to quickly pre-focus on a particular point might help you out some if it works on your model.</p></blockquote><p></p>
[QUOTE="nickt, post: 726011, member: 4923"] Short answer, either hold it or release it. The beauty of the technique is you hold the button for continuous focus or you release it for a simulated af-s mode. The long answer, I have to talk about a few things. There are two focus servo modes, af-s and af-c (nobody uses af-a). Af-c is continuous mode. Holding the shutter half way keeps on trying to focus. Its good for action. Its not good for focusing and recomposing. Won't work for that. Af-s is single focus. The camera grabs focus and does not try again as long as you hold the shutter half way. Its good for stationary shots especially if you need to recompose. Its not good for action. So that is the 'problem'. BBF is a solution. It in effect makes both modes available. The text book way of using the bbf technique is to set the back button to af-on. The camera is also placed in af-c mode, continuous auto focus. Most of our models (not d3000 series) have a menu setting that further defines af-c. It can be focus priority or release priority. Focus priority means the camera must see focus before the shutter will fire. Release priority means the shutter will fire regardless of focus. BBF is used with af-c, release priority. The shutter will fire no matter what. So with the back button set to af-on and af-c mode-release priority you are ready to go. When you press the button, you get continuous focus. So you can track moving subjects or a stationary subject too. At any time you can release the button and focusing stops. You can then point the camera somewhere else (recompose) and take the shot. Usually its used with a single focus point for more precision. So you could hold the button down and track something. Or you can point at your friend's eye, hit the back button once to focus, then release it. You can now recompose. Or you can focus on the bird feeder, then release the button. You are now pre-focused on the bird feeder for when the bird comes back. Or you can focus on a very distant tree line. Release the button and you are now prefocused at infinity and ready for a completely different infinity shot. I am not sure the d3500 can do this. The test would be set it up the back button along with af-c mode and single point focus. Focus on something and release the back button. Recompose without pushing the back button again and see if the shutter will fire. Even with your hand in front of the lens it should still fire. I think it may not fire the shutter on the d3500 because the focus point no longer sees focus. Now all this doesn't really solve your original question. But being able to quickly pre-focus on a particular point might help you out some if it works on your model. [/QUOTE]
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How to lock focus on D3500?
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