Re: EOS Which filters should I get for outdoors photography?

[Pierre Bellavance]

Hi,

My thinking was that there is more risk of vignetting on the 100-400 at 
100mm than at 400mm because of the wider view at 100mm.

Who's right?

Pierre

At 10:59 3/10/2001 -0500, you wrote:
>The exit pupil of a 400mm lens at 5.6 is 71.4mm, which is awful close to
>the size of your filter, especially if you consider the amount of
>material on the inside of the threads (probably more like 69mm or less
>actuall glass diameter measured from the back side).  You would most
>likely get vignetting at 400.
>
>Not sure about 100, but my guess is not.  It isn't a very wide angle of
>view and the exit pupil at 100/4.5 should be pretty small.  58mm filters
>work with a lot of extra room on a 100/2.8.  Are there flaws in my
>filter logic here at the 100mm end?
>
>Mike

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