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<blockquote data-quote="aroy" data-source="post: 360277" data-attributes="member: 16090"><p>In general Aperture or speed has nothing to do with sharpness. Sharpness is when the object is in perfect focus, and barring really horrible lenses, every one by Nikon is sharp when properly focused. Now the wider the aperture, the less is the DOF. What that means is that with a large DOF a lot of objects in front and behind the object will be in reasonable focus. For example if you focus on the eye from 2m away at F8, the nose, ears and may be the person behind will be reasonably in focus. In contrast if you use a wide aperture, say F1.8, then focusing on the eye, may leave the nose tip and the ears slightly out of focus.</p><p></p><p>[ATTACH]114940[/ATTACH]</p><p>F1.8. Right eye in focus, ear out of focus, background hazy</p><p></p><p>[ATTACH]114941[/ATTACH]</p><p>F3.2 The whole face is in focus, background less hazy</p><p></p><p>Similarly if a person is running at say 10km/h, that translates to 2,777 mm/sec. So if the exposure speed is 1/1000 sec the person has moved 2.7mm in real space. If the object is at a reasonable distance and the magnification of the lense 1:100 (normal for a long lense at 20m), then the blur will be 0.027mm, or 6 pixels in a 24MP DX sensor. Now increase the speed to 1/4000 and the blur will be about 1.5 pixel - insignificant and the image will look sharp.</p></blockquote><p></p>
[QUOTE="aroy, post: 360277, member: 16090"] In general Aperture or speed has nothing to do with sharpness. Sharpness is when the object is in perfect focus, and barring really horrible lenses, every one by Nikon is sharp when properly focused. Now the wider the aperture, the less is the DOF. What that means is that with a large DOF a lot of objects in front and behind the object will be in reasonable focus. For example if you focus on the eye from 2m away at F8, the nose, ears and may be the person behind will be reasonably in focus. In contrast if you use a wide aperture, say F1.8, then focusing on the eye, may leave the nose tip and the ears slightly out of focus. [ATTACH=CONFIG]114940._xfImport[/ATTACH] F1.8. Right eye in focus, ear out of focus, background hazy [ATTACH=CONFIG]114941._xfImport[/ATTACH] F3.2 The whole face is in focus, background less hazy Similarly if a person is running at say 10km/h, that translates to 2,777 mm/sec. So if the exposure speed is 1/1000 sec the person has moved 2.7mm in real space. If the object is at a reasonable distance and the magnification of the lense 1:100 (normal for a long lense at 20m), then the blur will be 0.027mm, or 6 pixels in a 24MP DX sensor. Now increase the speed to 1/4000 and the blur will be about 1.5 pixel - insignificant and the image will look sharp. [/QUOTE]
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