Comparing hispeed lenses-Full apertures

Started Sep 15, 2011 | Discussions thread
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3dreal
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Comparing hispeed lenses-Full apertures
Sep 15, 2011

I want to know the real aperture at 35mm on this lens(of new s100):
e.g. 24-120/ 24/2.0

comparing it to the 35/2.6 of 35-140(a590is).

How is it calculated?
Thanks a lot

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