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<blockquote data-quote="blackstar" data-source="post: 734298" data-attributes="member: 47518">Thanks, Fred.Ok, NR is recommended being turned on when a single long exp shot is taken, but not when multi-interval shots are done (avoid time gap in between shots). Now the question turns to why Nikon cameras need to take the same long time to make the &quot;dark frame&quot;? As someone pointed out that one can take a dark frame self once at the temperature being shooting.&nbsp; So once done shooting or during a lull, simply take a 3 minute or so shot with the lens cap on and maybe a sleeve to ensure no light gets in.&nbsp; This becomes a dark frame that can then later applied for dark frame subtraction in PS by simply putting the two frames as layers with the dark frame on top and then using the Difference blending mode and adjusting the opacity to eliminate or reduce the hot spots. I'm not sure this out-camera way of NR can perform similar effectiveness. If it does (or better), then the question is: why can't Nikon cameras take less time to shoot dark frame? (Oh, well, guess this will become a dumb question... )And I may have to take back my guess that after long-exp shot and starting NR process, camera, etc. can be moved away from the scene. Because shooting dark frame should be done under the condition at the scene.</blockquote>

[QUOTE="blackstar, post: 734298, member: 47518"] Thanks, Fred. Ok, NR is recommended being turned on when a single long exp shot is taken, but not when multi-interval shots are done (avoid time gap in between shots). Now the question turns to why Nikon cameras need to take the same long time to make the "dark frame"? As someone pointed out that one can take a dark frame self once at the temperature being shooting. So once done shooting or during a lull, simply take a 3 minute or so shot with the lens cap on and maybe a sleeve to ensure no light gets in. This becomes a dark frame that can then later applied for dark frame subtraction in PS by simply putting the two frames as layers with the dark frame on top and then using the Difference blending mode and adjusting the opacity to eliminate or reduce the hot spots. I'm not sure this out-camera way of NR can perform similar effectiveness. If it does (or better), then the question is: why can't Nikon cameras take less time to shoot dark frame? (Oh, well, guess this will become a dumb question... ) And I may have to take back my guess that after long-exp shot and starting NR process, camera, etc. can be moved away from the scene. Because shooting dark frame should be done under the condition at the scene. [/QUOTE]

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