Gary Fisher wrote:
<equally big snip>
>
> > As an addendum, most, if not all, micro USM lenses
> > have rotating front elements, ring USM lenses have
> > stationary front elements. This makes it easier
> > to use filters that require orientation, like
> > polarizers and gradients.
>
> Skip,
>
> Make that most. There's always at least one exception
> to every rule (I think they taught that in first grade
> English!).
>
> The 50 1.4 USM has micro motor USM but its front
> element doesn't rotate. It does however use the front
> element(s) to focus, so the front of the lens while
> not rotating, moves in and out during focusing.
>
> It's also the only lens that breaks the rule about
> micro motor lenses not having full time manual
> focusing :-)
>
> Regards
> Gary
>
> __________________________________________________
> Do You Yahoo!?
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I thought so, I just couldn't remember which ones.
Skip
--
Shadowcatcher Imagery
http://www.shadowcatcherimagery.com
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