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<blockquote data-quote="nickt" data-source="post: 413024" data-attributes="member: 4923">Just to add to what Horoscope said, your viewfinder is an actual view through your lens. You cannot change that view with a different iso (at least not in a useful way). There is no mechanism for that to happen in the viewfinder, you can only see actual light. As HSF said, you can activate depth of field preview and that will darken your view because it activates the aperture and things will darken as the lens stops down. You could have set the function button to behave as the preview button. To cause what you may have experienced, you could also put yourself in say shutter priority and of course this will cause a change in aperture as you change iso and you would see a corresponding light/dark change if you push the preview button. However, that change is simply the light you see coming through based on the aperture selected. The actual exposure will not necessarily match the lightness or darkness that you will see with the preview button. So in that respect, it's useless for previewing iso. It may explain what you thought was happening.</blockquote>

[QUOTE="nickt, post: 413024, member: 4923"] Just to add to what Horoscope said, your viewfinder is an actual view through your lens. You cannot change that view with a different iso (at least not in a useful way). There is no mechanism for that to happen in the viewfinder, you can only see actual light. As HSF said, you can activate depth of field preview and that will darken your view because it activates the aperture and things will darken as the lens stops down. You could have set the function button to behave as the preview button. To cause what you may have experienced, you could also put yourself in say shutter priority and of course this will cause a change in aperture as you change iso and you would see a corresponding light/dark change if you push the preview button. However, that change is simply the light you see coming through based on the aperture selected. The actual exposure will not necessarily match the lightness or darkness that you will see with the preview button. So in that respect, it's useless for previewing iso. It may explain what you thought was happening. [/QUOTE]

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