Originally posted by: Zenmervolt
Originally posted by: jamesbond007
Originally posted by: Gobadgrs
Things might look out of focus b/c I had the aperature at F2.8 and the wind was blowing and moving the branches around a bit. I had the autofocus set to centerpoint only, instead of the regular matrix of 9.
Things should not look OOF at f/2.8. I could maybe understand if you were shooting the 85 f/1.2L, but not a 2.8 zoom lens. If the lens continues to shoot 'soft' like this, it may need to be sent in for calibration. The shutter speed at 1/1250s would have stopped or negated any kind of wind or motion on your behalf as well as the berry in the tree. However, if the berry was moving slightly, I could understand then for the reason for the appearance of misfocus. I also typically recommend shooting with the center-point focus only or at least moving the focus point around in the matrix manually if you are going to compose shots like this. It gives you more control of the composure and framing of the shot, which should be thought out before you release the shutter.
An F/2.8 zoom can has exactly the same DOF as an F/2.8 prime when the two are equivalent focal lengths. My own F/2.8 "normal" zoom will focus to 13 inches at full telephoto (70mm). That gives me a focus plane that is only 0.08 inches deep. Definitely small enough for the wind to blow something far enough towards or away from the camera that it leaves the focus plane as I shoot.
Now, granted, he's using a lens with a minimum focus distance of 4.9 feet instead of 13 inches, but he's still going to have a very thin plane of focus. At 70mm he's dealing with a plane of focus that is 1.8 inches deep, but at 200mm it's only 0.24 inches deep. Even if he isn't maxing out the zoom, he's still dealing with a very narrow plane of focus and if there's a stiff breeze it's not at all uncommon to see the tips of grasses moving a couple of inches in the wind.
ZV