I still would stack for the sky background in DSS, but first I will examine each individual frame and compare the position of the Milky Way relative to my foreground element(s) of interest. The solution is much like case a, but requires more planning. Stacking in DSS with alignment of the stars (to improve the S/N of the dimmer parts of the Milky Way) will result in motion blur of the foreground, as if you were on a tracking mount. Stacking in StarTrails will cause the undesired long star trails you hope to avoid. This is actually not too bad for producing the timelapse, because it adds to the perceived smoothness of the motion.īut at the end, you'd like to take that entire set and turn it into a single image.
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The longer exposure will allow a slightly lower ISO setting, and less noise at the expense of a tiny amount of trailing in each frame. The longer exposure you can get away with, just settle on something that is acceptable to you. Short enough to prevent too much star trailing (it's a tradeoff, and the shorter the fL In that event you need to keep individual exposures Shots of the Milky Way moving across the sky for a timelapse. (I've found that the lighten screen blend mode for foreground elements can still be a problem if I allow the foreground from all images to be stacked in StarTrails, because shadow detail may seem to blur with the motion of whatever ambient light source is illuminating it - a better result is obtained from a single adjusted image)Ĭase c - is what I imagine you're most interested in. If noise reduction of the sky background is your intent, you can take a few short exposures and stack them in DSS with alignment on to increase the overall S/N, without the foreground motion becoming excessive and blurring into the area where your composited foreground long exposure shot is.Ĭase b) No need for much explanation here - when I want the trails, while shooting on a static tripod I use StarTrails to stack multiple images (as from a sequence intended for a timeplapse) and composite in the single best foreground image. The longer foreground exposure will almost surely be long enough to blow out the stars, and the same effect will result from stacking.
Nothing is really gained by stacking multiple short exposures for single point stars. There are several separate cases that I have encountered in my experience:Ī) Night shot with stars, and terrestrial foreground elements (trees, buildings etc)ī) Night shot with terrestrial foreground elements where I DO desire star trailsĬ) Night shots with terrestrial foreground elements where the sky contains some element that benefits from long/accumulated/stacked result (eg Orion Nebula, Andromeda Galaxy, Milky Way)Ĭase a) is the simplest - take separate exposures for foreground and background (with different focus) and composite them together. I also have a D5100 and the Tokina 11-16 which I use for wide angle night shots.
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