The object here to shoot several shots of the same subject but at varying ISO settings. Increasing the sensitivity (ISO) rating of the sensor allows one to shoot at higher shutter speeds or smaller apertures in lower light. The trade off however is the introduction of noise and this can be seen as increasing as we move through the sequence below. These are crops from the original files.
ISO 200
ISO 400
ISO 800
ISO 1600
ISO 3200
We see noise becoming apparent as soon as ISO 800 but it is not a problem and software can deal with it without the loss of too much detail. As we get past ISO 1600 however it is quite apparent especially in the shadows (which is were we expect it to be worse). What was also noticed in this exercise was overexposure past ISO 1600. This is because the camera was used in Aperture priority mode and once at ISO 800 the shutter speed was already at its maximum of 1/8000 sec. This meant the camera meter could no longer compensate for the high sensitivity by increasing shutter speed and therefore recorded latter shots as overexposed.
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