My little photo project for today was to play with the WhiBal in the yard. As I was getting set up, a bird landed near by so I thought it would be a good target of opportunity. When I looked at the shot on the computer, it was pretty badly out of focus. I was shooting at f2.8, so that means skinny depth of field. I thought that it might just be the wide open lens. Everybody knows that a lens has a sharpness sweet spot. For this Canon Zoom 24-70 f2.8L lens it seems to be about f8. That seems as good a guess as any for most lenses. Anyway I went back out and took a few more frames at different f stops. Guess what? The lens is sharper at f8 than f2.8. Also guess what? The bird was merely out of focus and it was not a sharpness issue. I have to get a grip. I often start punching the shutter before I am certain that everything is just right. That just wastes electrons.