ISO in Photography: The Essential Guide (+ Tips)
Briefly

ISO is a camera's sensitivity to light, where higher values result in brighter images. However, increasing ISO can lead to noise in the pictures.
Handling ISO requires an understanding of camera technology, but with practice, photographers can master it more easily than they might expect.
Each camera generally includes a range of ISO settings, from standard low values to much higher preliminary options, enabling versatility in various lighting conditions.
In photography, effectively using ISO is crucial for achieving clean, sharp images while avoiding the noise that can accompany higher ISO settings.
Read at Digital Photography School
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