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Sigma 17-35mm f/2.8-4 D Aspherical EX

The double row of aperture numbers on the originally Nikon mount 17-35 would be to suit the optical aperture display in some models of Nikon. A small prism system transmits an optical image of the selected aperture number to a small window offset from the main viewfinder. In the days before electronic readouts.
Regards.

Jan Dallas
Thu Feb 10 20:23:47 PST 2005

When using a program exposure mode on a Nikon camera you must set the lens to the smallest aperture. The aperture lock prevents you from accidently switching from the smallest aperture.

Phil DeMayo
Sat, 06 Jan 2007 17:35:01 -0800

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