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

Started Jul 24, 2014 | Discussions thread
bobn2
bobn2 Forum Pro • Posts: 63,506
Re: Focal length 35mm equivalent, but not F-stop?

mostlyboringphotog wrote:

pavi1 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?

Because it is Babel.

May be for the fixed lens cams but the lens manufacturer would not list FL in equivalent unless they want to lose their prestige.

The reason the equivalent f-stop is problematic is because let's say f/2 4/3 lens is equivalent to f/4 on FF but if you attach f/2 4/3 lens on FF body, is it a f/2 lens or f/4 lens

It's always an f/2 lens. It will behave just like an f/2 lens on an FF camera, which is like an f/1.0 lens would behave on a mFT camera. It's image circle probably won't cover the whole frame. Users of system which have more than one sensor size tend to be aware of this.

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Bob

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tko
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