On 5/5/2010 7:33 PM, Chuck Norcutt wrote:
> I really have no idea but would suggest that it's possible the Big Foot
> reduces its focal length when focusing at macro ranges such that the f/2.5
> aperture at 125mm might be, say, f/2 at 100mm.
>
Unless it has an internal Photon Flux Multiplier.
A. Quantum Moose
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