What's the advantage of having a constant aperture zoom then? Aren't we
losing useful aperture at the shorter end if we are limiting ourselves to
the center?
confused,
-e
> I would think that telephoto zooms with constant max.
> aperture "use" an aperture to take advantage of the full
> area of the front element AT THE LONG END, while at the
> short end, it would only use a center portion of it.
>
> The front element (or even several lens elements) is
> basically oversized for that focal length. The "useful"
> aperture is smaller than the front element.
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