Re: EOS EF 20-35 with extension tubes

[M.J.Shupe]

Because the maximum reproduction ratio for the 20-35 is measured at 35mm
and minimum focus distance, while the 20mm is much wider but focuses
closer.  It is like comparing two different lenses for this spec.  They
certainly aren't quoting the reproduction ratio for the 20mm end.

Mike



Pierre Bellavance wrote:
> 
> Hi,
> 
> What surprises me is that the magnification ratios of these two lenses are
> almost the same (0.14 for the 20mm vs 0.13 for the 20-35) while their
> closest focusing distances are quite different.
> 
> How can that be?
> 
> Pierre
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