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Keep Shooting! Photography Assignments (04 Feb 2013)
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Longer exposure or higher ISO?
Took a couple of night shots a couple of days ago which were a first for me. It was windy and kind of cold and my friend who was with me didn't have a jacket (!), so I didn't stay real long to play with things, but I got a couple of decent shots, all at ISO 100 and a longer exposure (20-30 seconds). It got the light trails I wanted, but I wondered what other people do. Would you up the ISO a bit in that case to allow for slightly shorter exposure? Would that change the look of the photo at all? I know both long exposure and higher ISOs introduce more noise to an image, so it seems about a horse a piece in that regard.
Anyway, here are two similar images that I got. Thanks for taking the time to think about my questions!
This shot is perfect with long exposure; however, if you are trying to capture crisp distant background stars or moon on a clearer night, you'll want a faster shutter speed because even stars and especially the moon move quite fast
Still 20 to 30 seconds is still good for stars. Stars blur around the 2 minute mark. Also , you may want multiple exposures using higher ISO to capture dimmer stars
Also note if light pollution is too bad where you are, all you will get is a yellow glow
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