Re: [OM] Zuiko 50mm f 1.4 Optical Formula.

[John A. Lind]

>What is "groups"?
>What is "elements"?

An _element_ is a single piece of glass.  A _goup_ is two or more of them
cemented together with their surfaces flush (no air between).  Typically
this is done with two or more lens elements that have two different
refractive indices (made from different types of glass).

-- John

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