Pierre Bellavance wrote:
> 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?
Actually, I see two possible explanations:
1) The 0.13 magnification of the zoom is for the 35mm setting.
2) They have a very different optical design. If the distance between
the nodal points is different, the focusing distance will also differ at
the same magnification (by the same amount)
I think explanation 1 is more likeiy, although 2 is probably true as
well. But the difference is likely not nearly enough to explain it all
alone.
Thomas Bantel
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