Shel is right on this one. The mere act of zooming lengthens the light
path, which, in turn, causes the light falloff or change in F-stop. Yes it
is wide open for viewing but wide open is slower as the focal changes.
Bruce Dayton
Sacramento, CA
----- Original Message -----
From: "Ann Sanfedele" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, January 15, 2001 2:11 PM
Subject: Re: Manual focus
> snip<
>
> > Shel sez:
> > Well, the lens ain't an f4.0 - it's an f4.0-5.6, which means
> > that when you're using a focal length greater than 35mm, the
> > actual aperture is smaller than f4.0.
>
> ann replies
> Well, yeah, but the aperture doesn't change until you take the pic,
> right? Not?
>
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