Placing colloidal spheres in the immediate proximity of fluorescent molecules makes it possible to achieve single-molecule imaging at high temperatures with a low-cost system. In an optical microscope ...

The Celestron Nature DX ED 12x50 are some of the finest handheld binoculars for stargazing, wildlife observations and more. Their key in flexibility is their use of high-end extra-low dispersion (ED) ...

For shooting in low light, particularly on grim days, a fast, wide aperture lens is a godsend. We find the best low light ...