Not had one of these before so looks like user stupidity in not realisikng this 'feature' exists, although it is a bit freaky watching the camera randomly changing the aperture based on where I point the camera even with aperture mode set?
It is common with macro lenses, from another forum this explains it:-
F-numbers engraved on the lens indicate the aperture at infinity. As any lens focuses, the optical center (nodal point) moves away from the film plane, but the aperture diameter remains constant. But, by the inverse square law, the amount of light reaching the film plane decreases. When shooting at life size, the light loss is two stops. At ½ life size, a one-stop reduction occurs.
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