Boasting a 42mm objective lens and a 10x magnification, Bushnell's ED Prime HD monocular comes with multi-coated glass and anti-reflective optics, providing clear and detailed views at just 13.2 oz.

The best compact binoculars are powerful but small enough to slip in a pocket, just what you need for great views on the go. With Prime Day on the way, you stand to save more on these binos.

Abstract: Control of phase contrast in electron microscope images is presently achieved by fine vernier control of the dc objective lens current. An incremental change δJ in lens current produces a ...