Do yourself a favor and check to see if your camera has a feature called Auto ISO. It is really cool especially if you shoot in Aperture Priority (Av) mode.
So to backtrack a little bit, Aperture Priority mode means that all you have to do is select your desired aperture and the camera figures out what proper shutter speed it should use to give your a decently exposed image. Now I say "decent" because it isn't always dead on. By default, the camera exposes for what it assumes is 18% gray. If you have a light skinned bride in a white dress then you want her to appear light or white in the image. That is where Exposure Compensation comes into play. If you need your image is under exposed (check the histogram) then dial the exposure compensation up to +0.7 or so. Vice versa if the image is too bright.
Now you still have to set your ISO but that can be a pain OR your shutter speed may end up getting set by the camera so that it is way to slow and causes camera shake or unwanted motion blur. This is where AUTO ISO comes in handy. When you enable Auto ISO on your camera, you also set a minimum shutter speed that you do not want to go slower than. For me, I toy between 1/60" and 1/80". You also get to pick what your minimum and maximum ISO should be. This is beneficial if your camera doesn't have awesome files at higher ISOs. Simply set the maximum ISO to the best high ISO files that your camera can produce. For me, I have no problem going to ISO 6400 on my D700 as long as I can ensure my images will not be under-exposed even in the slightest.
So after you set your Auto ISO up then it is time to rock and roll. What goes on in the camera is that it takes your minimum shutter speed into consideration when it's figuring out what value to use. IF the needed shutter speed is slower than your minimum then it automatically bumps up your ISO to let in more light for you and thus, allowing you to shoot at faster shutter speeds.
Hope this helps. Please comment below if you use Auto ISO and share your thoughts. Enjoy and be inLIGHTin'ed.
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