I have a d200 and i want to know what is auto iso and how do you use it ?.
#1. "RE: Auto iso " | In response to Reply # 0JonK Nikonian since 03rd Jul 2004Thu 13-Sep-12 10:50 PM
It's actually pretty simple and quite useful.
• Exposure is a combination of ISO, aperture, and shutter speed.
• In Aperture Priority, the ISO and aperture are set and the shutter speed varies.
• In Shutter Speed Priority, the ISO and shutter speed are set and the aperture varier.
• In Auto ISO, the aperture and shutter speed are set and the ISO varies.
Auto ISO is useful when you need to set both the aperture for depth of field control and shutter speed for motion control.
I have shot Auto ISO for these subjects:
• Early morning/late afternoon wildlife or birds. The light changing as time passes.
• Theatrical performances, again where the light varies from one part of the stage to another or from scene to scene.
• City walks, where are sometimes I am shooting in sun, sometimes in shade.
Implementing Auto ISO varies from body to body — Nikon has tweaked it through the years — but generally you have to turn it on and then set a minimum and a maximum ISO. Some bodies will also allow you to set a minimum shutter speed.
A New York City Nikonian and Team Member
Please visit my website and critique the images!
#2. "RE: Auto iso " | In response to Reply # 0ericbowles Nikonian since 25th Nov 2005Fri 14-Sep-12 07:39 PM
I find Auto ISO is most useful when I have a desired shutter speed and aperture but the light level varies. An example of that is a football game where a player moves from full sun into a shadow. There is no time to adjust ISO but Auto ISO makes the adjustment. Aperture Priority would address the scene with a slower shutter speed - maybe too slow for a sharp image. Shutter Priority would adjust aperture - but if you were already wide open it would simply create a dark image. Manual exposure with Auto ISO would give you a correct exposure at the lowest possible ISO without changing your shutter speed or aperture.
Auto ISO is also useful with high ISO levels to drop the ISO if you have adequate light.
I don't use auto ISO if the light on the subject is constant with changing backgrounds. And I don't use ISO routinely - in most cases I have time to select the correct ISO and trade off as needed.
Workshops - Smokies Oct 2012
Nikonians membership — my most important photographic investment, after the camera