Photo Terms A-Z S is for Star Trails: :
Find a remote spot: Any place near an urban area will have sky glow that can suppress star trails. Use a freshly charged camera battery: Hour-long exposures eat batteries. For very long exposures, consider auxiliary power like a Quantum flash power pack. Use a wide-angle lens: Make sure to include a foreground element. Shoot at ISO 400 to 800: It’s high enough to record stars, and low enough to suppress noise. Set an aperture around f/5.6: It will provide pretty good depth of field; smaller apertures will make the star trails faint. Aim at the North Star: This gives the classic vortex effect.
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