>>3093447You'll want to be shooting it around f/8-f/5.6 most of the time, that's the sweet spot. At f/5.6 there's a little bit of vignetting and at f/4 it is pretty noticeable. You can mitigate this by using a centre weighted ND filter that is available for the lens (although it increases your exposure time so in the end it's not that different from just stopping down).
