![]() ![]() ![]() Foreground Focus & Exposure Considerations Detail of the foreground exposure after adjustments. With a 14mm lens on a full-frame camera, you’re limited to about 10 seconds before the stars move enough to create trails.įigure 7. This means using relatively short exposures considering how dark the night sky is. But since we’re interested in capturing sharp, pinpoint-like stars, we need to use a shutter speed short enough to prevent star trails. Open the shutter for a long time, and you’ll get an image with bright arcs or lines of the stars moving through the sky. This is great for creating star trail images. Earth rotates toward the east, so everything appears to move west. ![]() You may not notice it when you stand outside gazing up at the stars, but look closely at the location of a particular constellation and then check again a few minutes later, and you’ll notice it’s now a little more to the west. The speed decreases as you move north or south away from the equator, but the effect on our viewing of the night sky is the same wherever you are on Earth-the stars appear to “move” through the sky over time, but in reality, it is the Earth’s rotation that causes the perceived movement. Why do we need separate exposures? Why can’t we just take a single exposure of the scene and call it good? There are a few reasons.Įarth spins on its axis at about 1,000 miles per hour at the equator. The final composite consists of separate sky and foreground exposures that were blended in Photoshop. This image captures the Milky Way rising over a rocky beach on the coast of Maine. Make Separate Exposures For Night Sky Landscapes ![]()
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