Coddington lens
Quick Summary
A Coddington lens is a type of hand magnifier. It is made from a glass sphere with a deep groove cut around its middle, which acts as a diaphragm to reduce aberrations. This design combines two lens elements into a single thick one, with the groove helping to select light with fewer distortions. While it's a simple and inexpensive design, the working distance of a Coddington lens is very short. The lens is named after Henry Coddington, an English mathematician who lived in the 19th century.12
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