Here's some:
SMC: Super Multi Coating. Refers to a surface treatment of the glass.
M-: The M-series lenses, produced from ca. 1979 I think.
A-: The A-series lenses, produced from ca. 1983 ?
Has an A setting on the aperture ring, and lets the
camera house set the aperture automatically.
F-: First series of autofocus lenses.
FA-: Second and current series of autofocus lenses.
An additional asterisk (*) right after the letter means that the lens
contains at least one piece of so-called ED-glass (Extra low Dispersion).
Those lenses are (very) high priced top-performers.
Jostein
> -----Original Message-----
> From: Amita Guha [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, July 11, 2001 7:40 PM
> To: [EMAIL PROTECTED]
> Subject: what do the letters on the lens mean?
>
>
> Hi all, I have a newbie question. I was just wondering about the
> significance of the letter(s) before the focal length of a lens. For
> example, the A28-135. I checked Boz's page but I couldn't
> find anything
> explaining it.
>
> Thanks,
> Amita
>
>
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