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

[Ray Amos]

Pierre Bellavance wrote:
> 
> 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?


In theory, you are.  The wider the angle, the greater the chance of
vignetting.  Actually with the 100-400 IS lens there is no vignetting at
any focal length when using 72mm filters via a step-down ring.  I've
even used it for macro work in the 300-400 mm range with a 67mm filter
and could not tell any difference.      Ray Amos
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