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<blockquote data-quote="aroy" data-source="post: 341050" data-attributes="member: 16090">I think this was discussed a week ago, still here goes.To shoot night sky you need low noise, but long exposures increase the noise a lot, so does higher ISO. Here is a method used by Astromomers. Use ISO 100. Use your lense wide open. Use a lot of 1 second or less exposures, taken one after another. Instead of 30 seconds at ISO 1600, which translates to around 30*16 = 480 sec at ISO 100, take 500 shots at 1 sec, one after another. Then merge them using software. The advantage is. There will be less thermal noise in each shot.. Minimum noise at ISO 100. While merging the noise decreases as square root of number of shots<a href="http://petapixel.com/2013/05/29/a-look-at-reducing-noise-in-photographs-using-median-blending/" target="_blank">A Look at Reducing Noise in Photographs Using Median Blending</a><a href="http://www.instructables.com/id/Sharp-low-noise-photography-using-multiple-photos/" target="_blank">Sharp low-noise photography using multiple photos</a></blockquote>

[QUOTE="aroy, post: 341050, member: 16090"] I think this was discussed a week ago, still here goes. To shoot night sky you need low noise, but long exposures increase the noise a lot, so does higher ISO. Here is a method used by Astromomers . Use ISO 100 . Use your lense wide open . Use a lot of 1 second or less exposures, taken one after another. Instead of 30 seconds at ISO 1600, which translates to around 30*16 = 480 sec at ISO 100, take 500 shots at 1 sec, one after another. Then merge them using software. The advantage is . There will be less thermal noise in each shot. . Minimum noise at ISO 100 . While merging the noise decreases as square root of number of shots [url=http://petapixel.com/2013/05/29/a-look-at-reducing-noise-in-photographs-using-median-blending/]A Look at Reducing Noise in Photographs Using Median Blending[/url] [url=http://www.instructables.com/id/Sharp-low-noise-photography-using-multiple-photos/]Sharp low-noise photography using multiple photos[/url] [/QUOTE]

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