Lew,
my guess is that the camera is setting the effective aperture due to
changes in lens focal length and is not faulty. Your 28-85 is a
variable aperture zoom, so any small change in focal length (and focus
distance to a much lesser degree) will affect the actual effective
aperture of the lens. So, if you set f5.6 and zoom towards 85mm, the
camera will probably detect that the effective aperture has got
smaller and vice versa. If your trannies are correctly exposed, don't
worry, this sounds O.K. to me.
Stewart.
