Hyperfocal focusing

[rico1]

It depends on the lens, of course, but I use f/5.6 for sharpest results. Photodo notwithstanding, the definitive site for CZ C/Y is

http://www.geocities.com/ilprode/TestZ.htm

I expect all lenses for 135 film, including Contax G, to follow suit.

 

[martinmorley]

The smallest aperture gives the greatest depth of field. The optimum aperture varies from lens to lens, it is usually 1 or 2 stops wider then the smallest aperture. The smallest apertures can give reduced sharpness because diffraction caused at these small apertures takes the edge off the performance.