Pushing your camera to 3200ISO: Textured film look

[omar robles]

So I have heard from a number of cinematographers that pushing your cameras ISO to 3200 asa will get you a more textured look, and more film like highlights. My question is do you stop down on the lens afterward setting your camera to 3200, or do you put on a ND? The DP who mentioned this used an arri mini and his cinematography looked very film like. My F35 is native 450 iso so I am unable to try this with that camera.

Thanks