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auto ISO and changing f/stops or speed

Windy Vision

Terry, US
105 posts

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Windy Vision Registered since 01st Jul 2004
Fri 16-Apr-10 06:10 PM

OK call me dense. I have set the minimum speed to 125th of a second with the highest auto ISO at 6400; however when shooting in aperture mode in low light conditions the f/stop automatically goes to f/2.8 when I want to shoot at f/5.6 even when the ISO is increasing. Should not a higher ISO afford me the opportunity to keep the f stop at f/5.6 and not drop to 2.8 when the ISO is 3200 or even higher? Why is the f stop changing to f/2.8 when the ISO is increasing? I am finding that the speed is dropping or the f stop is becoming wider. What am I misunderstanding; I know that I have lots to learn. Thanks again. Also, I am still getting somewhat noisy photos and I do not think they should be that noisy when shooting at ISO 1500, the inside lighting is not that dark. Maybe I am asking too much of this camera. The D700 is better than the D200 when using a higher ISO but I was hoping for better images than what I am getting so far. I am using matrix metering, the 24-70 f/2.8 and 85mm f/1.4 lens mainly indoors.

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