"Peter" wrote:
Paul J Gans wrote:
I dimly recall the term "prime lens" as being the
lens whose focal length was equal (at least roughly)
to the diagonal of the film frame. That made a 50mm
(or 45mm) lens "prime" for 35mm film.
The usual term for this is "normal lens"
.... or "standard lens", which is common usage in the UK.
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