Are you bothered with your S5's lowlight capability? I'm! It's hard to tell that I'm using a Samsung S5 as it feels like my previous Samsung S3 is better. How do you get a great lowlight shot on S5?
There is a number of ways to improve low light performance on the S5.
The first major tweak is using Picture Stabilization.
The next one would be adjusting exposure and ISO settings to improve the image.
What needs to be said about low light performance with the S5 is that it is inherently restricted by hardware. The S5 has an individual pixel size of 1.12 which is quite small compared to other devices. This small pixel size limits the amount of light that reaches the sensor and as such low light capabilities suffer.
The ISOCELL sensor inside of the S5 vastly improves daylight performance but also has a negative effect on low light performance. The sensor doesn't deal well with high levels of ISO which results in grain in lower light. With that said, it doesn't mean all hope is lost, you are still able to capture some decent lowlight shots but they unfortunately aren't in the same class as the images produced by some other devices.
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