Is the sharpest spot generally in the middle of the zoom?\nie at around 50 on a 28-70? Aperture? I always though\nthat the smaller the aperture that sharper the image. But\nmy local shop reckon that F11-16 is the sharpest for many\nlenses. I have seen plenty of sharp landscapes taken at\nF11-16. Or is this because no tripod available to have a\nsmaller aperture? Would F22 be more sharp? Or am I\nconfusing Depth Of Field with sharpness?\n\nA little confused.\nD.R.