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Auto ISO Question
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<blockquote data-quote="WayneF" data-source="post: 519610" data-attributes="member: 12496"><p>I'm old school too, I prefer to set ISO first. But of course, high ISO performance is greatly better today, and Auto ISO is popular now. I am Not knocking Auto ISO, however Shutter Priority seems specifically ill suited for Auto ISO... because the aperture will always be wide open if Auto ISO is active.</p><p></p><p>Because Auto ISO works as last resort, when the automated settings have no more range to go, and increasing ISO is the last resort.</p><p></p><p>In S mode, we set shutter speed, and as the light falls, the aperture opens wider. When it hits the limit wide open and can go no more, then Auto ISO starts increasing. That means if Auto ISO kicks in, the lens aperture will be wide open, possibly not the best general choice for every picture. </p><p></p><p>In A mode, we set aperture and as the light falls, shutter speed slows. The concept is when it hits maximum limit, then auto ISO starts increasing. But since 30 seconds is unworkable and unusable, the Auto ISO menu adds an intermediate Minimum Shutter Speed setting, to be the threshold for increasing ISO. We can set any shutter speed as minimum, meaning this is the shutter speed active Auto ISO will always be using. So note that this Minimum Shutter Speed is sort of a replacement for S mode with Auto ISO, since it is the shutter speed that active ISO will always use (but we can still choose aperture). Shutter speed will of course go even slower if Maximum ISO is not sufficient.</p><p></p><p>In camera M mode, we set both shutter speed and aperture. Which is likely usually not precisely correct for the metered light, so then Auto ISO tries to be enough to make it be right, at that selected shutter and aperture. That is cute, and it makes Manual be an auto mode, but this method has less range than the others (others can also change some settings).</p><p></p><p>I would suggest considering that setting aperture and minimum shutter speed for Auto ISO in A mode is essentially the same thing as setting same values in Manual mode with Auto ISO, but with greater possible range, allowing a faster shutter in the brighter light, and able to force a slower shutter when max ISO simply is not enough. The only alternatives (other than greater user attention) are a bad exposure.</p></blockquote><p></p>
[QUOTE="WayneF, post: 519610, member: 12496"] I'm old school too, I prefer to set ISO first. But of course, high ISO performance is greatly better today, and Auto ISO is popular now. I am Not knocking Auto ISO, however Shutter Priority seems specifically ill suited for Auto ISO... because the aperture will always be wide open if Auto ISO is active. Because Auto ISO works as last resort, when the automated settings have no more range to go, and increasing ISO is the last resort. In S mode, we set shutter speed, and as the light falls, the aperture opens wider. When it hits the limit wide open and can go no more, then Auto ISO starts increasing. That means if Auto ISO kicks in, the lens aperture will be wide open, possibly not the best general choice for every picture. In A mode, we set aperture and as the light falls, shutter speed slows. The concept is when it hits maximum limit, then auto ISO starts increasing. But since 30 seconds is unworkable and unusable, the Auto ISO menu adds an intermediate Minimum Shutter Speed setting, to be the threshold for increasing ISO. We can set any shutter speed as minimum, meaning this is the shutter speed active Auto ISO will always be using. So note that this Minimum Shutter Speed is sort of a replacement for S mode with Auto ISO, since it is the shutter speed that active ISO will always use (but we can still choose aperture). Shutter speed will of course go even slower if Maximum ISO is not sufficient. In camera M mode, we set both shutter speed and aperture. Which is likely usually not precisely correct for the metered light, so then Auto ISO tries to be enough to make it be right, at that selected shutter and aperture. That is cute, and it makes Manual be an auto mode, but this method has less range than the others (others can also change some settings). I would suggest considering that setting aperture and minimum shutter speed for Auto ISO in A mode is essentially the same thing as setting same values in Manual mode with Auto ISO, but with greater possible range, allowing a faster shutter in the brighter light, and able to force a slower shutter when max ISO simply is not enough. The only alternatives (other than greater user attention) are a bad exposure. [/QUOTE]
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