>> Julian Loke wrote:
>> I saw in a local shop that the 20-35 has a flare-cutting diaphgram,
>> while the 20/2.8 does not.
> "Vicente" <[EMAIL PROTECTED]> wrote:
> There is no point in using a flare-cutting diaphgram in a prime lens.
> The flare-cutting diaphragm is a diaphragm that changes as you
> change the focal lenght of the lens in order to vignete the non
> used light rays.
> As the 20/2.8 has only one focal lenght there is no point in such
> diaphagm.
Hi Vincente,
I fear we may both be wrong, especially since the lenses have a round
diameter, but the film format is rectangular.
I could SEE the 20-35 Flare-cutting diaphragm (FCD) from the front of
the lens, but could not SEE an FCD in the 20/2.8.
Upon further reading (at Klaus Schroiff's Photozone), there are many
fixed (including the 20/2.8 and 300/2.8) and zoom lenses (including
the 28-135 IS) that use FCD. See:
http://www.photozone.de/canonFAQ.htm#3Q5c
Cheers
Julian Loke
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