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General Photography
Low Light & Night
Night Sky/Star/Milky way - f/4 and above
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<blockquote data-quote="BackdoorArts" data-source="post: 220898" data-attributes="member: 9240"><p>Less light means it takes longer exposure length to get the same effect, and as you've suggested, longer exposure length means you may now have to deal with star movement. Going from f2.8 to f4 is one stop, so if you would shoot at ISO 1600 at f2.8 you could achieve the same exposure at ISO 3200 (one stop faster) at f4 (one stop slower). Want to go to f5.6, just go to ISO 6400. Yes, you are allowing for more noise, so it's always a tradeoff.</p><p></p><p>As for when you get trails, it all depends on focal length, and at 60 seconds you'll see movement on anything greater than about 10mm. I thought there was a quick and easy way to calculate the maximum exposure time for each focal length without star movement, but I can't seem to remember of find it. There's a calculator here...</p><p></p><p><a href="http://perfectastronomy.com/calculate-star-trails/" target="_blank">How To Calculate Star Trails | Perfect Astronomy</a></p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 220898, member: 9240"] Less light means it takes longer exposure length to get the same effect, and as you've suggested, longer exposure length means you may now have to deal with star movement. Going from f2.8 to f4 is one stop, so if you would shoot at ISO 1600 at f2.8 you could achieve the same exposure at ISO 3200 (one stop faster) at f4 (one stop slower). Want to go to f5.6, just go to ISO 6400. Yes, you are allowing for more noise, so it's always a tradeoff. As for when you get trails, it all depends on focal length, and at 60 seconds you'll see movement on anything greater than about 10mm. I thought there was a quick and easy way to calculate the maximum exposure time for each focal length without star movement, but I can't seem to remember of find it. There's a calculator here... [url=http://perfectastronomy.com/calculate-star-trails/]How To Calculate Star Trails | Perfect Astronomy[/url] [/QUOTE]
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General Photography
Low Light & Night
Night Sky/Star/Milky way - f/4 and above
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