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Autofocus mechanism
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<blockquote data-quote="WayneF" data-source="post: 369119" data-attributes="member: 12496"><p>I agree, why would it? My take is the shutter button is placed better to be more able to press it without camera shake. The AE/AL is a programmable function button to change the way focus or exposure is locked, if desired. But you know that if they came out with a radio operated iPhone button, a certain percentage will swear it really helps. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>I am old fogy, but other than film speed, cameras have historically had only two controls, shutter speed and aperture. These still work the same today. Shutter mechanisms are faster now, and the CPU chip has made big changes in how focusing is done, but stopping motion still depends on shutter speed in the same way it always did. But of course, we can hear lots of opinions now. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p></p><p></p><p>Then I would first suspect a focus issue? Focus on a fast bird is certainly a different situation than a sitting bird.</p><p></p><p></p><p></p><p>The speedlight at low power (close range) will be much faster than any shutter speed, but seems not generally applicable to fast moving or distant birds. For this speedlight advantage to be true, ambient needs to be underexposed at least a couple of stops, so the continuous ambient will not let shutter speed (1/250 second) blur what the speedlight already stopped.</p><p></p><p>VR does NOT affect focus or subject motion. Its sensor is only about camera motion (shake). Common consensus is to turn VR off if not needed, or said better, turn it on when it is needed. Nikon says turn it off on a tripod, but to me, a fast shutter would seem to be the same thing. If it can't help, it can't hurt to turn it off. But I don't know if it matters or not. It seems clear it cannot help though.</p><p></p><p></p><p></p><p>Dunno, but it seems to me that if shutter speed makes VR unnecessary (shake), then anything VR might do anyway then is unwanted. But VR is never about subject motion or focus, it does not follow the subject.</p><p></p><p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000">42.6 MPH is 17.2 inches/second, and in 1/250 second, is 0.068 inches (approx 1/16 inch). This is speaking of shutter slit travel (distortion), exposure and motion freezing can be a few stops faster.</span></p> <p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000">It is said that a 1/25000 second speedlight flash (about 1/64 power at close range) is needed to stop hummingbird wings, but debateably, in practice, 1/8000 seems to do a reasonable job. </span></p> <p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000">This is actually a discussion I did not intend to participate in. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> But bottom line about the problem, do all you can.</span></p> <p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"></span></p></blockquote><p></p>
[QUOTE="WayneF, post: 369119, member: 12496"] I agree, why would it? My take is the shutter button is placed better to be more able to press it without camera shake. The AE/AL is a programmable function button to change the way focus or exposure is locked, if desired. But you know that if they came out with a radio operated iPhone button, a certain percentage will swear it really helps. :) I am old fogy, but other than film speed, cameras have historically had only two controls, shutter speed and aperture. These still work the same today. Shutter mechanisms are faster now, and the CPU chip has made big changes in how focusing is done, but stopping motion still depends on shutter speed in the same way it always did. But of course, we can hear lots of opinions now. :) Then I would first suspect a focus issue? Focus on a fast bird is certainly a different situation than a sitting bird. The speedlight at low power (close range) will be much faster than any shutter speed, but seems not generally applicable to fast moving or distant birds. For this speedlight advantage to be true, ambient needs to be underexposed at least a couple of stops, so the continuous ambient will not let shutter speed (1/250 second) blur what the speedlight already stopped. VR does NOT affect focus or subject motion. Its sensor is only about camera motion (shake). Common consensus is to turn VR off if not needed, or said better, turn it on when it is needed. Nikon says turn it off on a tripod, but to me, a fast shutter would seem to be the same thing. If it can't help, it can't hurt to turn it off. But I don't know if it matters or not. It seems clear it cannot help though. Dunno, but it seems to me that if shutter speed makes VR unnecessary (shake), then anything VR might do anyway then is unwanted. But VR is never about subject motion or focus, it does not follow the subject. [LEFT][COLOR=#000000] 42.6 MPH is 17.2 inches/second, and in 1/250 second, is 0.068 inches (approx 1/16 inch). This is speaking of shutter slit travel (distortion), exposure and motion freezing can be a few stops faster. It is said that a 1/25000 second speedlight flash (about 1/64 power at close range) is needed to stop hummingbird wings, but debateably, in practice, 1/8000 seems to do a reasonable job. This is actually a discussion I did not intend to participate in. :) But bottom line about the problem, do all you can. [/COLOR][/LEFT] [/QUOTE]
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