Why do my Nikon D3200 photos look noisy at ISO 200?
Asked 8/29/2015
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2 answers
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I’m new to DSLR photography and just bought a Nikon D3200 with a 50mm f/1.8D lens. In some test shots at ISO 200, the images look fine on the camera screen, but on my laptop they seem slightly grainy, especially when viewed zoomed in. One example was shot at 1/60 sec, f/1.8, and the image is straight out of camera with no editing. Is this normal image noise, or could there be something wrong with the sensor?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
6
Three things are unavoidable in life: death, taxes and noise :)
There is always noise. It is just more visible in low light. Higher ISO have even more noise because their signal is amplified. So shooting at lower ISO, like you did, is better but that does not mean no noise.
To improve further what you need is more light. That gives more signal relative to the noise, so it will be less apparent. This is also why a larger sensor will help. Each pixel, simply because it is larger will collect more light for the same scene, when shot at the same aperture.
Originally by user1620. Source · Licensed CC BY-SA 4.0
user1620
10y ago
0
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What you’re seeing is most likely normal noise, not a faulty sensor.
All digital photos contain some noise. Lower ISO settings like 200 reduce it, but they do not eliminate it. Noise becomes more noticeable in lower light and when you inspect images closely on a computer, especially when zooming in.
In your example, the main cause is likely limited light. When there’s less light reaching the sensor, the image signal is weaker relative to the background noise, so grain becomes easier to see. That’s why adding more light generally improves image quality.
Viewing at high magnification can also make perfectly normal noise seem worse than it really is. If the image looks fine at normal viewing sizes, you may be overanalyzing it a bit.
So yes, it is probably noise—but normal noise. To reduce how visible it is, give the sensor more light when possible. Higher ISO would usually make the noise more apparent, not less.
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