For nature watchers and low-light observers, does the premium-priced, premium build Leica APO-Televid 65 deliver the goods?

The numbers on binoculars indicate the magnification and size of the objective lens. For example, one of the most common magnification and objective sizes is the 10×42 (spoken as 10-by-42). The 10x in ...

Quality-control laboratories continue to use the ASTM chart comparison method to analyze inclusions. With this technique, ... ASTM E45 standard specified that inclusion ratings should be performed ...

Objective diameter divide by magnification yields exit pupil. At 4X the 20mm objective scope on bottom would be just as bright as the 56mm objective at top if it were set at 11X. Ron Spomer. Yes, a ...

TECHSPEC Ultra Compact Objective Assemblies are designed at 2x magnification and are configurable to achieve 4x, 5x, 10x, 15x, and 20x magnifications by adding longer extension tubes.

Choosing Objective Lenses: The Importance of Numerical Aperture and Magnification in Digital Optical Microscopy, Biological Bulletin, Vol ... The Importance of Numerical Aperture and Magnification in ...