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<blockquote data-quote="blackstar" data-source="post: 734336" data-attributes="member: 47518">Thanks again, Fred.I found something interesting (and somewhat even more puzzling) in an article of Professor Morison's Astronomy Digest: &quot; It is often not well noted that a single dark frame is actually quite noisy and will add noise into an image...&quot; And so the author offers a second option to the in-camera NR: multiple dark frames for post-process (out-camera). The theory (and practicality) is that the averaged stacking multi-dark frame will vastly reduce noise in individual dark frames. However, it also has timing and technical cost on controlling and stabilizing sensor temp. Hence, there is the 3rd option: no dark frame used; NR off. The experiments demonstrated in the article are some deep space and the Milky Way imagings (not really single long exp star trail shot as in 30 min). The results of 2nd (multi-DF+PS) and 3rd options interestingly invite your verdict:[ATTACH]338473[/ATTACH][ATTACH]338474[/ATTACH]</blockquote>

[QUOTE="blackstar, post: 734336, member: 47518"] Thanks again, Fred. I found something interesting (and somewhat even more puzzling) in an article of Professor Morison's Astronomy Digest: " It is often not well noted that a single dark frame is actually quite noisy and will add noise into an image..." And so the author offers a second option to the in-camera NR: multiple dark frames for post-process (out-camera). The theory (and practicality) is that the averaged stacking multi-dark frame will vastly reduce noise in individual dark frames. However, it also has timing and technical cost on controlling and stabilizing sensor temp. Hence, there is the 3rd option: no dark frame used; NR off. The experiments demonstrated in the article are some deep space and the Milky Way imagings (not really single long exp star trail shot as in 30 min). The results of 2nd (multi-DF+PS) and 3rd options interestingly invite your verdict: [ATTACH=CONFIG]338473._xfImport[/ATTACH] [ATTACH=CONFIG]338474._xfImport[/ATTACH] [/QUOTE]

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