Thanks everyone for your replies. I went for the max aperture to create the bokeh effect but I expect I will still get it to some extent by stepping down. The distance to the subject is usually between 10 and 50m. Covering a whole shinty pitch (180 X 80m) isn't doable with a 200m lens so i tend to stick to around a 50m max. I am noticing that even though the subject at the focus point shown by the editing software is actually out of focus, 30m further back is sharp. I wonder if I haven't given the camera enough time to find the focus before pressing the shutter all the way? Either that or I have pressed the shutter half way while swinging the camera to latch on to the moving subject and have actually focused on something else? You have certainly given me plenty to think about, thanks. Couldn't put any examples up as they seem to be too big.
