Rethinking focal length conventions

Started 7 months ago | Discussions thread
Phil A Martin
Phil A Martin Veteran Member • Posts: 6,349
re 43mm

https://www.whatdigitalcamera.com/roundup/lens-roundup/best-standard-prime-lenses-dslrs-67865

"Standard, or normal, lenses are those whose focal length approximates the diagonal of the format for which they are designed. With the diagonal measurement of a full-frame sensor being just over 43mm, this results in SLR-specific lenses offering a focal length of around 43mm falling under this terminology. Such lenses are often said to deliver a perspective that approximates that of the human eye.

Although a handful of 43mm lenses do exist, most manufacturers round things up to 50mm for their ‘standard’ offerings. There are also a number of equivalent lenses specifically designed for APS-C-sensors, although given the crop factor of these bodies, the lenses need to be shorter to compensate for this; lenses with a focal length around 30-35mm result in an equivalent angle of view on such cameras."

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