Focal length 35mm equivalent, but not F-stop?

Started Jul 24, 2014 | Discussions thread
John Sheehy Forum Pro • Posts: 22,718
Re: Focal length 35mm equivalent, but not F-stop?
4

Chikoo wrote:

All camera manufacturer when they publish technical specification of their camera lens publish the focal length and it's equivalent in 35mm. But the same is not done for F-stop. Why?

f-numbers are ratios of real focal length divided by physical aperture size, and have nothing to do sensor sizes.

If manufacturers used the "35mm equivalent focal lengths" in the ratio, then they'd also have to scale the ISOs also to make exposure triangles work. Do you want that kind of a mess?

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