M. Field (Elec. Comm., 21, No. 3; 1943) describes and discusses the measured characteristics of a number of electrostatic lenses, giving the characteristic curves of nine different lenses ...

The best compact binoculars are small and lightweight in size, but mighty in optical performance and portability. These are our top pocketable picks. Binoculars are a fantastic way to get a closer ...

The company says the 42-millimeter objective lens diameter makes them ideal for twilight or cloudy days, as well as sunny ones. It incorporates technology that the company says reduces distortion ...

Vertical close-up shot of gloved hands of anonymous scientist switching objective lenses on microscope during medical research of microorganisms in laboratory Royalty-free licenses let you pay once to ...

The Hestia has an interesting six-lens patented optical system. I would love to have seen the interior optics, but (wisely) the case is sealed. The objective lens is only 1.2 inches (30 ...