800 iso or 1600 iso

I use f2.8 at iso800 all the time.

Ralph Merlino wrote in post #5655211
I use f2.8 at iso800 all the time.

Outside when it's sunny?

I doubt you'd see much difference in DOF in that case. BUT your lens will be sharper at f/4.

It's a crapshoot, & I'd probably go for ISO 1600 for any print under 12X18".

Gavin shoots everything at high ISO & provides fun captions as well. The first image is ISO Speed Ratings = 1600
The week's sporting events in images...

Shoot both ans use whichever is best. Also, if you expose to the right a bit you can bring the exposure back to normal in post processing and the noise almost goes away.

I'd go as high as possible. I like to expose heavily for ambient. Shooting wide open and a high aperture gives me that. Head over to the nightclub photography topics and you will see there are so many different ways of doing it.

Higher the ISO, the more ambient you can capture as rely less on keeping that shutter speed up or having a super fast lens.

ISO 1600 with 24-105 @ f/4

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PhotosGuy wrote in post #5658032
Gavin shoots everything at high ISO & provides fun captions as well. The first image is ISO Speed Ratings = 1600
The week's sporting events in images...

To be fair though, that image is about EV 10 1/3 - so open shade. If I shot in bright sunlight at f/2.8 and ISO800, I would require a shutter speed of 1/30000 of a second - unfortunately my camera doesn't go that high . I suppose I could put an ND filter on, but adjusting the ISO on a digital camera seems a little more convenient .

e-k