Mortimer Snerd opined....
>That's right... that's why the upgrade from FL to FD
>lenses on the old MF Canon SLR's was such a huge
>advance, you could now do coupled metering at full
>aperture WITHOUT having to tell the camera what the
>maximum aperture of the lens was. The Canon FT *had*
>to use stop-down metering, because the meter was not
>aware of what the maximum aperture of the lens was.
>
>With the FTB and FD lenses, you could have coupled
>metering at full aperture. (This is also why the Nikon
>AI lenses were such an advance over the pre-AI ones,
>you no longer had to do the semi-automatic "Nikon
>twist" to index the max aperture. As far as I can see,
>Nikon copied their coupling system from Minolta's MD
>mount!)
I remember those days. My first Canon was an FX in
1967--no TTL metering, just a little eye on the front
and a meter on the top. Used the FL type lens.
Then in 1977 I added an FTBn, with the FD lens as
you describe.
I sold 'em all to get into Olympus about 1983, but that's
a whole 'nother story +=<)B^)
DGW
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