ISO 800: If you’re shooting indoors without an additional light source like a flash, you’ll be working in this range. ISO 400: When the lighting is still good, but less intense - like indoors by a window or outside on a cloudy day - a slightly higher ISO is ideal. ISO 100: This is the best choice for shooting outdoors on sunny days - the brightest situation you’ll likely be shooting in. Here are a few general rules for finding the right sensitivity level for your DSLR or mirrorless camera’s digital sensor. High ISO increases your camera’s light sensitivity, which is ideal for low-light situations. Conversely, when less light is available, you need a higher ISO to compensate. In brighter lighting, lower ISO is best - low ISO values are better in well-lit scenarios. The ideal ISO number allows your camera to achieve good image quality by letting the right amount of light hit the image sensor. ISO standards in digital photography today still have the same numbering system to indicate the sensitivity of a digital camera sensor to light. Originally, ISO numbers were set by the International Organization for Standardization (where the name ISO comes from) to refer to the sensitivity of the film in a camera to light.
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