Selecting the correct ISO in-camera is probably the most critical setting you can make because it’s impossible to effectively reduce noise later without trading off sharpness and reducing contras. Choose the lowest ISO possible on your camera at all time for the best result. Pixels will be sharper,colors punchier and contrast at its best.

ISO 100

Choosing the lowest setting of ISO give the finest result possible as the sensor can perform at its optimum setting


ISO 400

at ISO 400 the camera increase the grain, or electrical sensitivity, of the sensor and the results are more interference.


ISO 1600

at this ISO, camera boost the sensor signal at the expense of sharpness, contrast and color balance.

Source: Digital Camera Magazine, page 47, issue 42 June 2009

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