Abbreviation for Deutsche Industrie Norm and describes a large family of product standards. For film emulsions, the DIN System is the logarithmic method of determining emulsion speeds developed by the German standards organization Deutscher Normenausschuss. The emulsion speed is doubled for each increase of three in the DIN speed value.
SPHERICAL VS. ASPHERIC LENSES
HOW THEY’RE USED IN IMAGING APPLICATIONS
Optical Lenses are often categorized by their shape. Two common surface shapes are spherical and aspherical. Each offers unique characteristics that make it suitable for different use cases.