Julian Loke wrote:
>
> Over on eosdoc, there is some dispute about the type of
> autofocus motor used in the EF 50mm f/1.8 (the original
> version) that was discontinued in 1990.
>
> Some sources say "Micromotor".
> Other sources say "Arc Form Drive".
>
> This thread is even in the List Archives as far back as
> 1996, but with no satisfactory resolution.
>
> Does anyone have an old version of Lens Work? Or an old
> "EF Lenses" Brochure from before 1990.
>
> Cheers
> Julian Loke
> http://eosdoc.com/
The advertising brochure that I got when I bought my first
620 (back in 1987) says that all EOS autofocus lenses are
either AFD or USM. The brochure is PUB. C-CE-272A. The
EF 50mm f/1.8 data sheet that came with the lens does NOT
say anything about the drive motor.
-Nick T.
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