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A comment on Using FujiFilm SDK on a Camera Voids Its Warranty. Parent comment

Re:Using FujiFilm SDK on a Camera Voids Its Warranty by LorenPechtel on Thursday March 24, 2022 @11:40PM (#30798413)
Cinema requires different lenses.

A standard camera lens will not remain in focus while zooming. Cinema lenses have to--imposing restrictions that cause the lenses to be a lot more expensive. (A cinema lens works fine for still photography, but why pay the price/weight premium?)

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Re:Using FujiFilm SDK on a Camera Voids Its Warranty by nullc on Friday March 25, 2022 @01:28AM (#30798924)
Parfocalness can be emulated in firmware (by adjusting the focus as the zoom changes).

What you probably should have pointed out is the opposite property: keeping the same focal length while changing the focus distance. This can't be emulated in software because camera lenses don't have a motor on the zoom (plus primes don't have a zoom). Some cine lenses do achieve this by moving a zoom-like group (I think all the ARRI master primes do) and not just by being telecentric on the exit side.

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