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General Photography
Low Light & Night
First night shot
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<blockquote data-quote="crycocyon" data-source="post: 133225" data-attributes="member: 13076"><p>Ok for that second one the stars are there and looking at how much light there was there's a balance between how much star light you can actually capture above the background intensity of the sky. Yes for night shots shoot wide open or for better sharpness go one stop down from wide open. I wouldn't use auto ISO for night shots because the camera will want to go very high on the ISO to reduce camera shake, and then apply the NR on top of that to compensate. I can see plenty of noise in that image and it looks like the ISO was at least 1600 or more, maybe even 6400. I never shoot above 200 ISO and keep it that way in manual mode and then can always adjust it manually using the camera buttons to override that if necessary. You would only stop down if you wanted to get star trails with exposures on the order of minutes, and even then you would still keep ISO down. Or at least I wouldn't push it beyond 1600 but different sensors have different high ISO performance. </p><p></p><p>I can actually see the stars moved a bit as well in the second shot. What was the difference between that shot and the first one? Taken earlier? Also a 20 s exposure? </p><p></p><p>The noise that is introduced with longer exposures results from dark current in the chip and with a darker background that noise shows up more clearly. I'm not sure if the 5100 has long exposure NR like the D800 has, but it might be safer to not apply NR and then do the NR in post and that way you have more control over the kind of NR you are applying. </p><p></p><p>Nice shots though....</p></blockquote><p></p>
[QUOTE="crycocyon, post: 133225, member: 13076"] Ok for that second one the stars are there and looking at how much light there was there's a balance between how much star light you can actually capture above the background intensity of the sky. Yes for night shots shoot wide open or for better sharpness go one stop down from wide open. I wouldn't use auto ISO for night shots because the camera will want to go very high on the ISO to reduce camera shake, and then apply the NR on top of that to compensate. I can see plenty of noise in that image and it looks like the ISO was at least 1600 or more, maybe even 6400. I never shoot above 200 ISO and keep it that way in manual mode and then can always adjust it manually using the camera buttons to override that if necessary. You would only stop down if you wanted to get star trails with exposures on the order of minutes, and even then you would still keep ISO down. Or at least I wouldn't push it beyond 1600 but different sensors have different high ISO performance. I can actually see the stars moved a bit as well in the second shot. What was the difference between that shot and the first one? Taken earlier? Also a 20 s exposure? The noise that is introduced with longer exposures results from dark current in the chip and with a darker background that noise shows up more clearly. I'm not sure if the 5100 has long exposure NR like the D800 has, but it might be safer to not apply NR and then do the NR in post and that way you have more control over the kind of NR you are applying. Nice shots though.... [/QUOTE]
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First night shot
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