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Message: <blockquote data-quote="MartinCornwall" data-source="post: 220441" data-attributes="member: 12701"><p>If you do 30min exposures you will be introducing a lot of noise and unless you are at a really dark site your sky will be blown out by light pollution. The following settings will serve you much better. M Mode, Manual focus, stop down your lens by a few f stops, 30 secs exposures, ISO between 400-1600 depending on how many stars you want to be in your trails. Shooting time is up to you but the more shots you take the longer the star trails. Use a program like Starstax to stack all your images together and save the final result as one image showing the long star trails. Google Star Trailing and you will bring up a wealth of information on this subject.</p></blockquote><p></p>