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

Started Jul 24, 2014 | Discussions thread
Great Bustard Forum Pro • Posts: 43,687
Re: Focal length 35mm equivalent, but not F-stop?

Pixel Pooper wrote:

Lee Jay wrote:

John Sheehy wrote:

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?

Absolutely I do.

This got me thinking, what if cameras did use equivalent apertures, not just in spec sheets, but for exposure settings as well? Would it be more or less confusing for everyday shooting? I'm not sure I know the answer but it could be an interesting discussion and I think it deserves its own thread, so I started this one.

Not a fan. Actual focal lengths and actual apertures, whether that be the relative aperture (f-ratio) or virtual aperture (entrance pupil) diameter.

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