"John M. Lovda" <[EMAIL PROTECTED]> wrote:


> I compared this lens design with the FD model.  They are virtually
> identical in block diagram "formula" but because of the EOS film plane
> distances the EF glass is about 20% bigger in diameter and overall
> length.

One strange thing with the FD version is that while the front lens
does not rotate when focussing the filter thread does.
With the EF version the filter thread does not rotate.

-- 

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