OK..I'm not real clear on this. Here is the scenario: I'm shooting night football, Lens is a 300 2.8 VR wide open at 2.8,using Aperture prioroty, ISO sensitivity on at 6400 with minimum shutter speed set to 500. If light falls off and ISO goes to 6400, will the camera drop the shutter speed below 500 or will the shot be under exposed if the light were to get worse?

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"Technical aspects MUST be innate"



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The shutter speed will drop.

I thought the shutter speed would not go below 500 if the min speed is set to 500 in the menue? I get somewhat confussed on this as well. I have my min speed at 125 and the auto ISO at 6400. I did this to keep the blurring taking people shots in low light conditions shooting in apature priority. I do have one simple question and I need to test this myself, when using the SB800 on the hot shoe will the speed automatily shot at the 60th of a second even if I have set the min speed to 125th in the menue option of the auto ISO? I have a group shot to do, outside and was planning to use the flash with a GF difusser instead of just the ambient light as I do not know what the outside lighting is going to be until shooting time, it could be bright sunlight or a nice even overcast day.

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>I thought the shutter speed would not go below 500 if the min
>speed is set to 500 in the menue?

Sometimes it will. jpFoto was correct, but to put a bit more detail behind it...

Let's say you are in aperture priority and have chosen an aperture of f/5.6 and a base ISO setting of 200. In the ISO sensitivity auto control screen of the Shooting Menu, you have turned it ON and set the Minimum shutter speed to 1/125th, and the Maximum sensitivity to 6400.

If light levels are such that the camera can choose a shutter speed faster than 1/125th, then all is well and the ISO stays at 200. If light levels fall such that the camera would need to choose 1/100th or slower, then the shutter speed would stay at 1/125th and the ISO would be raised in synch. If light levels keep falling, the shutter speed stays at 1/125th and the ISO rises, but eventually the ISO reaches 6400. From there, if it gets darker still the ISO will stay at 6400 and the shutter speed will drop below 1/125th.

In other words, the Maximum sensitivity is a hard limit, the Minimum shutter speed is not. The camera always tries to find a correct exposure if it can

Brian
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Brain,
Thank you...you are always so eloquent in your responses!

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Chester

The only two ways to keep your shutter speed at 125th is to shoot in M (manual) mode or S (shutter speed priority) mode. Keep in mind that you are more likely to run out of f stops in "S" before you would run out of shutter speeds in "A" in a low light situation. If you're shooting RAW, you may be able to salvage underexposed shots in PP.

As for the rest of your question regarding your flash settings, the answer depends upon how you have your flash set up. Your camera and flash are capable of using extremely high shutter speeds depending upon the flash mode that you are using. In the old days, cameras needed to sync at 1/60 to avoid a partially black frame. That is not the case today, but I think that you need to go through the flash manual. I have an SB900, but I am sure that the SB800 is similar. (BTW, that was not a "simple question.")

Good luck with your shoot.

D