Canon EF 20mm f/2.8 VS FD 20mm f/2.8

More than 20 years of engineering between these two lenses and, other that the USM, the old FD version was actually better. You could shoot at f/2.8 ad have almost no vignetting at all.
Canon EF 20mm f/2.8 VS FD 20mm f/2.8
See samples of Canon EF 20mm f/2.8 VS FD 20mm f/2.8.

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