Digital BW, The Print

You're very close there.

The coupling prong at the top of the lens was the very first kind of meter 
fitting, as the Nikon F metered via a prism it was very convenient to have a 
direct mechanical hookup between the lens and the prism, bypassing the body 
altogether.

Later lenses had a mechanical connection inside the lens to convey the same 
information, and later lenses still use an electronic connection from a chip 
in the lens!

On Saturday 19 Jan 2002 3:56 am, Pics4U@... wrote:
> All manual focus lenses lack the electrical contacts to convey
> aperture information to the body. Pre-Ai glass even lacks the little
> horseshoe device to mechanically convey this info. Bodies without
> the Ai mechanical connection cannot read any manual focus lens
> either with or without Ai installed.
>
> Greg
>
> > Could you refer me to any documentation of the manual lens focus
> > limitation (on the S!)?
> >
> > Thanks
> >
> > Bill
>
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