Are there any "rules" for using ISO?

Started Apr 3, 2013 | Discussions thread
Rich Rosen Senior Member • Posts: 2,406
Re: Are there any "rules" for using ISO?

GreenMountainGirl wrote:

I have been experimenting with low-light images of moving subjects (mostly deer) and getting mixed results.  Using aperture-priority produces slower shutter speeds, and raising ISO does not seem to work.  Using shutter-priority works better, but still often have to make exposure adjustments in LR4.  Most of these photos are at/close to 300mm, so have not noticed any significant effect on DOF, just need to get a better idea of ISO (and exposure compensation) because there often isn't much time for "test photos"!


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Hi Susan,

Football, or basketball is a little different than wildlife. But I also have tussled with that third member of the exposure triangle. While our cameras ( I have a D600, you a D7000) have very good capabilities in the ISO department,  there are limitations. For me, ISO is the last thing I change. I try to keep it at the lowest possible ISO, in order to keep color saturation deep as possible. But I am also trying to stop the action, so my shutter speed has got to be between 1/250th and 1/500th  or higher. I want to isolate my subject so my aperture must be pretty wide open. If I can't meet those parameters with the ISO I have set, I change it. I don't use auto ISO. My absolute limit on ISO is 6400. In the basketball arena,  I use manual settings. On the football field during the day, I use aperture priority, keeping an eye on my shutter speed and adjusting ISO as needed. The ISO button on the Nikon is really convenient fot changing while shooting. I am, of course, working in a more controlled environment, than you.  For that grab shot, I would worry about getting the opportunity in the camera. . Since I shoot raw 90% of the time, I do want an exposure between -/+ 1/3rd of a stop and adjust for taste in Aperture.


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