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Nikon DSLR Cameras
D7000
Problems with long shutter speed when it gets dark?
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<blockquote data-quote="RockyNH_RIP" data-source="post: 161362" data-attributes="member: 10784"><p>Nick,</p><p></p><p>I was incorrect on the mirror staying up but many sources on the net explain there is a 2nd shot, black (not saved). This states the shot is taken with the shutter closed...</p><p></p><p>This had come up as a question on the forum a few weeks back which is </p><p></p><p>Here is one such example....</p><p></p><p><span style="color: #ff0000"><em>Nikon knows that their sensors might exhibit more noise than is acceptable in exposures longer than 8 seconds. The sensor can start to warm up a little when longer exposures are used. This causes a condition called amp noise, in which warmer sections of the sensor start to create more noise than cooler sections. There are two settings for Long exp. NR (figure 2):</em></span></p><p><span style="color: #ff0000"><em></em></span></p><p><span style="color: #ff0000"><em></em></span></p><ul> <li data-xf-list-type="ul"><span style="color: #ff0000"><em><strong>On </strong>– When you select On and an exposure is longer than 8 seconds, the camera will take two exposures with approximately same time for each. Nikon says that the D7000 can sometimes take the second exposure in as little as half the time as the first one. The first exposure is the normal picture-taking exposure. The second one is a black-frame subtraction exposure, which is a second image that is exposed for the about the same duration as the first image, but the shutter is closed. The noise in the black-frame exposure is examined and then subtracted from the original image. It’s really quite effective and beats having to blur the image to get rid of noise. I’ve taken exposures of around 30 seconds and had perfectly usable results. The only drawback is that the total exposure time can be as much as doubled because two exposures are made. The black-frame exposure is not written to the memory card, so you’ll have only one image, with much less noise, in the end. While the black-frame exposure is being processed, a message of Job nr will blink in any active displays. When Job nr is flashing, you cannot use the camera. If you turn it off while Job nr is flashing, the camera will keep the first image, but it won’t do any noise reduction on it.</em></span></li> </ul><p>Anyway, have fun shooting... <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>Pat in NH</p></blockquote><p></p>
[QUOTE="RockyNH_RIP, post: 161362, member: 10784"] Nick, I was incorrect on the mirror staying up but many sources on the net explain there is a 2nd shot, black (not saved). This states the shot is taken with the shutter closed... This had come up as a question on the forum a few weeks back which is Here is one such example.... [COLOR=#ff0000][I]Nikon knows that their sensors might exhibit more noise than is acceptable in exposures longer than 8 seconds. The sensor can start to warm up a little when longer exposures are used. This causes a condition called amp noise, in which warmer sections of the sensor start to create more noise than cooler sections. There are two settings for Long exp. NR (figure 2): [/I][/COLOR] [LIST] [*][COLOR=#ff0000][I][B]On [/B]– When you select On and an exposure is longer than 8 seconds, the camera will take two exposures with approximately same time for each. Nikon says that the D7000 can sometimes take the second exposure in as little as half the time as the first one. The first exposure is the normal picture-taking exposure. The second one is a black-frame subtraction exposure, which is a second image that is exposed for the about the same duration as the first image, but the shutter is closed. The noise in the black-frame exposure is examined and then subtracted from the original image. It’s really quite effective and beats having to blur the image to get rid of noise. I’ve taken exposures of around 30 seconds and had perfectly usable results. The only drawback is that the total exposure time can be as much as doubled because two exposures are made. The black-frame exposure is not written to the memory card, so you’ll have only one image, with much less noise, in the end. While the black-frame exposure is being processed, a message of Job nr will blink in any active displays. When Job nr is flashing, you cannot use the camera. If you turn it off while Job nr is flashing, the camera will keep the first image, but it won’t do any noise reduction on it.[/I][/COLOR] [/LIST] Anyway, have fun shooting... :) Pat in NH [/QUOTE]
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D7000
Problems with long shutter speed when it gets dark?
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