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General Photography
Low Light & Night
M42 (Orion Nebula)
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<blockquote data-quote="STM" data-source="post: 751151" data-attributes="member: 12827"><p>We have a waxing crescent right now but it is not significant enough (12%) to have a major impact on Orion right now. Plus it sets at 9:13 tonight so it will be below the horizon before it really becomes a factor. It is supposed to be clear tonight so I am going go out and re-shoot it. This image was a one off; just one shot, no dark, bias or flat frames. I got my flats and darks shot last night but when I went out last night around midnight and was setting up for the bias and light frames it all clouded up. <em><strong>CRAP!! </strong></em><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite4" alt=":mad:" title="Mad :mad:" loading="lazy" data-shortname=":mad:" /> I already have the flats and darks taken now, so tonight I all I have to shoot are the bias (once the camera cools to ambient temp), and the light files. I will probably shoot 120-150 light files and stack everything in DeepSkyStacker. This one was also shot at ISO 3200, which in hindsight was excessive; it added a lot of noise and skewed the histogram to the right. I had to try to minimize the noise by "stretching" the shadow index marker in levels in Photoshop. I am going to shoot at ISO 800 tonight and expose for 1.3 sec @ f/2.8 using the 300mm f/2.8 ED IF AIS. I think that will make for a significantly better image. 1.3sec is about my limit in the advanced MFN calc to prevent star trails. </p><p></p><p>If you have not checked it out, go to <a href="http://web.archive.org/web/20200220123345/https://www.sahavre.fr/tutoriels/astrophoto/34-regle-npf-temps-de-pose-pour-eviter-le-file-d-etoiles" target="_blank">Société Astronomique du Havre - Règle NPF : temps de pose pour éviter le filé d'étoiles (archive.org)</a> and use the calculator there. It is awesome! It does the rule of 500, which is pretty outdated, a simplified and an advanced MFN calc. I use the advanced one as it is more conservative. It will be in the box on the left side of the screen, divided into 9 squares. Pick the average, but stay on the low side, of all of the 9 squares for the best exposure length.</p></blockquote><p></p>
[QUOTE="STM, post: 751151, member: 12827"] We have a waxing crescent right now but it is not significant enough (12%) to have a major impact on Orion right now. Plus it sets at 9:13 tonight so it will be below the horizon before it really becomes a factor. It is supposed to be clear tonight so I am going go out and re-shoot it. This image was a one off; just one shot, no dark, bias or flat frames. I got my flats and darks shot last night but when I went out last night around midnight and was setting up for the bias and light frames it all clouded up. [I][B]CRAP!! [/B][/I]:mad: I already have the flats and darks taken now, so tonight I all I have to shoot are the bias (once the camera cools to ambient temp), and the light files. I will probably shoot 120-150 light files and stack everything in DeepSkyStacker. This one was also shot at ISO 3200, which in hindsight was excessive; it added a lot of noise and skewed the histogram to the right. I had to try to minimize the noise by "stretching" the shadow index marker in levels in Photoshop. I am going to shoot at ISO 800 tonight and expose for 1.3 sec @ f/2.8 using the 300mm f/2.8 ED IF AIS. I think that will make for a significantly better image. 1.3sec is about my limit in the advanced MFN calc to prevent star trails. If you have not checked it out, go to [URL="http://web.archive.org/web/20200220123345/https://www.sahavre.fr/tutoriels/astrophoto/34-regle-npf-temps-de-pose-pour-eviter-le-file-d-etoiles"]Société Astronomique du Havre - Règle NPF : temps de pose pour éviter le filé d'étoiles (archive.org)[/URL] and use the calculator there. It is awesome! It does the rule of 500, which is pretty outdated, a simplified and an advanced MFN calc. I use the advanced one as it is more conservative. It will be in the box on the left side of the screen, divided into 9 squares. Pick the average, but stay on the low side, of all of the 9 squares for the best exposure length. [/QUOTE]
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