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<blockquote data-quote="aroy" data-source="post: 493613" data-attributes="member: 16090">You need Auto ISO, when you are shooting in variable light and would not want to change the aperture, while at the same time maintain high enough exposure speed to capture motion. If you use fixed ISO, then. If you are in A mode, the speed will change to adjust for the light changes and at times it will be too low resulting in blurred images. If you are in S mode, then aperture will keep changing till it reaches either end (minimum or maximum), and after that the exposure will either be under exposed or over exposed, some thing you may not want. Also at times we want to fix the aperture for either isolation or good DOF, so constantly changing aperture will defeat the purpose.In auto ISO mode, once you set the minimum speed and the ISO range, ISO will change in accordance with the scene lighting. If the light is too high, then ISO will be minimum set and the speed will increase (a bonus when shooting fast moving objects)</blockquote>

[QUOTE="aroy, post: 493613, member: 16090"] You need Auto ISO, when you are shooting in variable light and would not want to change the aperture, while at the same time maintain high enough exposure speed to capture motion. If you use fixed ISO, then . If you are in A mode, the speed will change to adjust for the light changes and at times it will be too low resulting in blurred images . If you are in S mode, then aperture will keep changing till it reaches either end (minimum or maximum), and after that the exposure will either be under exposed or over exposed, some thing you may not want. Also at times we want to fix the aperture for either isolation or good DOF, so constantly changing aperture will defeat the purpose. In auto ISO mode, once you set the minimum speed and the ISO range, ISO will change in accordance with the scene lighting. If the light is too high, then ISO will be minimum set and the speed will increase (a bonus when shooting fast moving objects) [/QUOTE]

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