John Hermanson wrote:
> First time I've heard of any 50 1.4 being radioactive. The 55 1.2 has been
> discussed in detail here.
>
I believe it was AG who said that a very few, early 50/1.4s had
radioactive element(s).
As I recall, he said they had rather good overall performance, even at
wider apertures.
Then he next, non-radioactive element version had similar central
sharpness, but poorer outer regions.
And the next version had better overall balance of sharpness across the
frame, but lost some in the center.
A Dimly Recalling Moose
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