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Nikon DSLR Cameras
D7100
Dark speck in image
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<blockquote data-quote="Bob Blaylock" data-source="post: 353503" data-attributes="member: 16749"><p>By the way, here's how best to take an image that will show up the dust on your sensor…</p><p></p><ol> <li data-xf-list-type="ol">You've got the 18-55mm “kit lens” that is standard with this camera, right? Mount that lens.</li> <li data-xf-list-type="ol">Set the autofucuts switch on the lens to “M”, and manually focus it to infinity</li> <li data-xf-list-type="ol">Set the zoom to its longest focal length, 55mm.</li> <li data-xf-list-type="ol">Set your camera to aperture-priority mode.</li> <li data-xf-list-type="ol">Set the aperture to its largest number (smallest aperture) which will be ƒ36 with this lens.</li> <li data-xf-list-type="ol">Set your camera's ISO setting to its lowest value.</li> <li data-xf-list-type="ol">Bring up a browser or some other application on your computer's screen with a blank page/document, so that you just have a big expanse of plain white on your screen.</li> <li data-xf-list-type="ol">Holding the camera an inch or two away from the screen, take a picture. Move the camera around a bit during the several seconds of the exposure.</li> </ol><p></p><p> The idea here is to not really take a picture of anything outside of the camera, but to evenly and narrowly illuminate the sensor, record what the sensor is seeing. The point of using the smallest possible aperture is to provide the narrowest possible light source. A narrower light source makes for sharper shadows, which is why, in the pictures you've taken so far, the dirt shows up more prominently the smaller the aperture you use.</p><p></p><p> If your sensor was perfectly clean, and perfectly free of any noise, any unevenness, or any other possible imperfections, then you would just get a picture that contained nothing but the same uniform solid shade of grey. Nobody's sensor is that perfect. If there is any dust, dirt, or foreign material on your sensor, then that is what will show up most prominently.</p></blockquote><p></p>
[QUOTE="Bob Blaylock, post: 353503, member: 16749"] By the way, here's how best to take an image that will show up the dust on your sensor… [list=1][*]You've got the 18-55mm “kit lens” that is standard with this camera, right? Mount that lens. [*]Set the autofucuts switch on the lens to “M”, and manually focus it to infinity [*]Set the zoom to its longest focal length, 55mm. [*]Set your camera to aperture-priority mode. [*]Set the aperture to its largest number (smallest aperture) which will be ƒ36 with this lens. [*]Set your camera's ISO setting to its lowest value. [*]Bring up a browser or some other application on your computer's screen with a blank page/document, so that you just have a big expanse of plain white on your screen. [*]Holding the camera an inch or two away from the screen, take a picture. Move the camera around a bit during the several seconds of the exposure.[/list] The idea here is to not really take a picture of anything outside of the camera, but to evenly and narrowly illuminate the sensor, record what the sensor is seeing. The point of using the smallest possible aperture is to provide the narrowest possible light source. A narrower light source makes for sharper shadows, which is why, in the pictures you've taken so far, the dirt shows up more prominently the smaller the aperture you use. If your sensor was perfectly clean, and perfectly free of any noise, any unevenness, or any other possible imperfections, then you would just get a picture that contained nothing but the same uniform solid shade of grey. Nobody's sensor is that perfect. If there is any dust, dirt, or foreign material on your sensor, then that is what will show up most prominently. [/QUOTE]
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D7100
Dark speck in image
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