Hi! Not going to lie, this is my first camera ever and I am struggling! I downloaded the cheat sheets for my D3200. A lot of them suggest switching my ISO sensitivity to Auto, but I can't. I get a message saying that I can't in the camera's current state. I've tried A, S, and M modes, but none of them will let me. Please help!
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@Moose, I agree. It's odd that we can't toggle Auto ISO in the ISO settings menu. It's possible on the more pro bodies like the D7000, D7100, or any of the full frame bodies. You just hold the ISO button and rotate the front dial. But we don't have a front dial and Nikon probably doesn't want to waste time changing up the menu interface across their cameras. So that's probably why "Auto" is there in the ISO settings, just sitting there teasing us by not letting us select it.
In M (manual) mode, since pressing the aperture button and rotating the rear dial is the equivalent of rotating the front dial on the D7xxx, I tried pressing the Fn button (which I’ve set to toggle ISO) along with the aperture button and rotated the rear dial hoping that it will toggle Auto ISO. No such luck…
In P,S,A and M modes, you must go to the menu and switch "auto" on or off there. When it's on, you also have the option of setting a maximum ISO it will go to, and a minimum shutter speed at which it takes effect. When shooting, you still set a base ISO, from which the camera will vary as needed. It will never go beyond the max you set in the menu, and unlike other models, it will also ignore user input higher than that max! You can still force higher ISO in the "scene" modes, but in P,S,A, and M, higher settings will be ignored even though they're shown on the rear screen. You must go back to the menu.
Just to add to the confusion, when choosing the minimum shutter speed here, there is also an "auto" setting. If you set this, then the shutter speed will be chosen by the camera depending on the focal length if the lens is AF, to an equivalent of 1/30. If the lens is not AF, it will default to 1/30. It ignores VR.
"Auto" will change ISO in P and A modes when the shutter speed goes below the minimum you chose in the menu. In S mode it will change ISO when maximum aperture is exceeded at the chosen shutter speed. In M mode it will change ISO when your chosen exposure does not satisfy the meter.
In the 'scene' modes, the menu options do not exist. In these modes, the default is always full auto (no base chosen by the user), but now "auto" will appear on the list of ISO choices with the Fn button. You can override full-auto operation in these modes and set a manual ISO. What you specify in one mode applies to all.
The D3200 differs from others, however, in that whenever you change ISO setting in P,S,A and M modes, it will always reset the 'scene' modes to "auto." It does this no matter which way you go, in auto or full manual mode.
In the two point and shoot modes, there is no user choice of ISO at all.