I just got the Lumix Nocticron 42.5mm lens and in the manual on page 7 it reads:
The aperture can be adjusted with the aperture ring only when a Panasonic digital camera is attached to the lens. (As of January 2014)
So, if I am using this lens on an Olympus OM-D body then does this mean that the lens behaves as though the aperture is set to "A" no matter what its actual position is? If so, why would this be? I would think that the aperture ring simply mechanically rotates the diaphragm. Why would it not work on non-Panasonic body?
I did test this by holding the unmounted lens up to a light and then rotating the aperture ring and sure enough the aperture did not change, so I guess it is true; but why would they do this? Seems like it would be simpler just to let the ring control the aperture. Why are they gimping the lens with this restriction?