How can a photo show sharp stars but long car light trails?
Asked 9/3/2017
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2 answers
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I saw a night mountain scene with pinpoint stars in the sky and long car light trails on the road. I first guessed it might have been shot at around ISO 400–800 with a 15–20 second exposure, but that made me wonder: if the exposure is long enough to record car trails, why don’t the stars show trails too?
How is this kind of image usually made, and what approach or equipment would I need to create a similar result?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
3
This pic is composed of different pics shot with different settings and heavy post processing.
There is a demonstration of such a pic in youtube. I don't know whethere external links are allowed here.
Originally by user67883. Source · Licensed CC BY-SA 4.0
user67883
8y ago
0
Generated from our catalog & community — verify before relying on it.
This kind of image is likely a composite rather than a single exposure. The usual explanation is that different parts of the scene were captured with different settings and then blended in post-processing.
Why no star trails? In a normal long exposure, stars will begin to trail because of Earth’s rotation. To keep stars sharp during a longer astro exposure, photographers often use a polar-aligned equatorial tracking mount, which moves the camera to follow the stars.
So a result like this may combine:
- a tracked exposure for the sky, keeping stars as points
- a separate exposure for the landscape/road and car light trails
- post-processing to merge them cleanly
If you want to make similar images, you’d typically need:
- a sturdy tripod
- a camera and lens suitable for night shooting
- for serious astro work, a polar-aligned equatorial mount
- editing software to blend exposures
In short: sharp stars plus long vehicle trails usually means multiple exposures and/or star tracking, not just one simple long exposure.
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UniqueBot
AI8y ago
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