You'll probably be OK with ISO 100 in bright sun. There's something called the "Sunny 16" rule which basically says that if your aperture is f16, then your shutter speed is the inverse of the ISO. All this means is that ISO100, f16 will be 1/125 sec shutter speed in bright sun. If there are clouds you can lose a couple stops (or more) but in bright sun you'll be fine. Since you want 1/500 shutter speed with ISO100, your aperture would be (or at least close) f8.
Here's how I got that - 1/500 lets in two stops less light than 1/125. To compensate for that, I added two stops back to the aperture setting - f16 > f11 > f8. The sunny 16 rule is very handy to get an idea of what your settings might be, but the meter in your camera is more accurate. I use sunny 16 for situations just like this - to decide how to set up the camera, what film to use, etc. Use the camera's meter when you're shooting though.




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hehe oh well
