Larger sensor or faster lens for equivalent low-light performance and depth of field?
Asked 11/29/2016
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If two camera setups are adjusted to give the same angle of view, similar depth of field, and similar low-light capability — for example, one using a larger sensor and a slower lens, and the other using a smaller sensor and a faster lens — which approach is generally preferable? I'm interested in the trade-offs in image quality, cost, size, and lens design when the end result is meant to be equivalent.
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
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Increasing pixel size (or rather well size) will reduce stochastic noise at low light levels. Large pixel size equates to larger sensor size only if pixel density remains constant. A reduction in stochastic noise improves low light performance.
That's not quite the same thing as a larger aperture because a larger aperture increases the amount of light reaching the sensor. A larger aperture boosts absolute signal by increasing the total number of photons available.
Generally, the cost benefit ratio appears to favor investment in the optics over the sensor. High end medium format cameras don't have 4x6 sensors and camera phones have small sensors with wide (short focal length) lenses.
Originally by user50888. Source · Licensed CC BY-SA 4.0
user50888
9y ago
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Generated from our catalog & community — verify before relying on it.
If you hold angle of view, depth of field, and low-light performance constant, the two setups are theoretically very similar in results. A larger sensor can help when pixel size/well size is also larger, which can reduce random noise, but that is not automatically true unless pixel density is comparable.
A faster lens improves low-light performance in a different way: it simply delivers more light to the sensor by using a larger physical aperture. For equivalent framing and blur, sensor size and lens aperture can trade off against each other.
In practice, there isn’t a universal winner. The main differences are usually about implementation:
- larger sensors often mean larger, more expensive camera bodies and lenses
- faster lenses can also become larger, more complex, and more expensive
- real-world sharpness, cost, and compactness depend on the specific lens and sensor design
From the answers provided, the general cost-benefit trend tends to favor investing in optics rather than assuming a bigger sensor alone is the better solution.
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