With a grounding in science and history, we now dive into the properties of camera lenses and explain the features of the modern camera lens for photography and cinematography from, Focal Length, Aperture, Primes vs. Zooms as well as some specialty features.

Watch the History and Science of Lenses:

Errata: the illustration at 1:10 is not an actual ray trace of that particular lens – here is a more accurate representation of the “effective focal length” which we call “the focal length”
http://filmmakeriq.com/wp-content/uploads/2016/01/Effective-Focal-Length-of-Lens.jpg

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