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Sensor speed is a completely irrelevant spec when it comes to maximum f-stop of a lens. The f-stop is a physical ratio. People that try to make "equivalent" f-s

Sensor speed is a completely irrelevant spec when it comes to maximum f-stop of a lens. The f-stop is a physical ratio. People that try to make "equivalent" f-stops do so by throwing out what it actually means in order to gauge some arbitrary level of performance of a format that fewer and fewer people know anything about. All of this nonsense started with digital photography. There was close to a century of shooting with different formats and lenses without ever trying to twist what an f-stop meant. Open up an ASC handbook and you'll find DOF charts for different formats and lenses but no talk of equivalent anything. I want to know the actual specs of a lens, that is how you can compare with similar systems. I wish Apple would drop the now irrelevant references to 35mm. I also wish people would stop confusing a physical measurement with a quality target. To reiterate, I find the concept of equivalent f-stops to be nonsensical and think they only confuse the issue.

wyager 3y ago
> The f-stop is a physical ratio. Which tells you precisely nothing at all without having other specs to multiply it out. It's a useless spec, in the format presented by Apple. > gauge some arbitrary level of performance The fact that it's arbitrary is irrelevant; the important part is that it is a consistent reference point across cameras. > I wish Apple would drop the now irrelevant references to 35mm. Yes, that would be ideal, but they're not going to do that, so at the very least they should just be consistent with the specs they provide.