> I've got a 28mm f/2.8, 50mm macro 2.8, and 50mm f/1.7. The first two
> have metal aperture rings, while the latter has plastic. Does anybody
> have copies of the first two with plastic, or the latter with metal? Did
> Pentax make all of the copies of a particular lens with the same
> material, or did they make the early ones with metal, and later ones with
> plastic?
>
General remark for plastic in the A series :
the more pentax expected a lens to sell, the more plastic in it.
50/1.7 mostly plastic
50/1.4 half plastic
200/2.8 very little plastic
etc.
Looks that a plastic mould only pays of for large production lots.
George
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