No, they always give the focal length in the 35mm equivalent. If you want a 16mm lens, you, you will need a 10mm APS-C lens (if you shoot canon, it's a 1.6x crop). Lenses designed for APS-C are often able to be smaller and are necessary to get into the ultra-wide-angle cat...
the lenses shown in FIG. 1 being a pair of standard matched plano-convex lenses, each having a focal length of 6 inches and a diameter of 4.52 inches. However, condenser lenses 5 are not critical to the operation of the machine; they can be dispensed with, if desired, and replaced by...