>>I believe each model was made of the same material. For instance, all
>>A50/1.7 were made of plastic, not just the aperture ring.
>
>Sorry, no A series lens has a plastic barrel, my A50 f/1.7 is in Singapore 
>at
>the moment so it is hard to check but I will check the ring when it 
>returns.

The body of the A50/1.7 and the aperture ring were made of plastic. The 
barrel of the lens elements were metal. And the screw holes have the 
tendenecy to crack.

regards,
Alan Chan

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