Both are 7 in 7 designs, although the optical design did change somewhat 
between the two. The latter SMC-M version is essentially the SMC-A 
version with a non-A mount and aperture ring. It looks like they may 
have run out of parts for the earlier version and decided to put the A 
into production early, without spilling the beans on the A's most 
interesting features.

-Adam

Shel Belinkoff wrote:
> It could be.  There are, BTW, two M28/2.8 designs.
> 
> Shel
> 
> 
> 
>> [Original Message]
>> From: <[EMAIL PROTECTED] (Ralf R. Radermacher)>
> 
>>> Or the FA 28/2.8 AL - great lens at a great price.
>> Is this a different optical design compared to the old M 2.8/28 mm?
> 
> 
> 


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