Scene luminance has nothing to do with exposure.

Open for Discussion.

My comment . the camera is taking the exposure, the scene is what it is.

I tried to take a photograph with no scene luminance

And this is what I got
So I would think that it is

[deleted]

If there is no rain and you stand outside have you been exposed to rain? Would you not need to have some kind of exposure to rain to get exposed to rain?

If a guy runs up to me wearing a trench coat and flashes me but he is wearing normal clothing underneath the trench coat have I been exposed to nudity?
Would there not be the need to have exposure to nudity to say I was exposed to nudity?

Exposure determines how much light hits the sensor. That depends on shutter speed, aperture, and scene light.

It does if you want your photo to look like your subject! :)

That is not the role of exposure. E.g., the lightness (ISO) and the colors (WB) are not part of exposure.

What happens if I pre WB the light with light modifiers to produce a uniform WB across different light sources in the scene?

If I am modifying my illuminate to cast a different WB differently across my FOV or if I am introducing colored light to a backdrop then WB and color can part of the exposure

What does "taking the exposure" mean, though? "Recording the exposure"? If so, then, sure, your camera is "taking the exposure", but the exposure it is taking is a function of the scene luminance, the f-number, and the exposure time. And, yes, you or your camera can alter the f-number and/or exposure time to account for different scene luminances to get the same exposure, but this doesn't change the fact that scene luminance is a factor in the exposure.

Well played, Don. 😉

I suspect that this thread already has a space reserved for it in the Dumpster. It's only waiting for Danno to contribute before the mods send it south.

same i took an image at 12,000 sec at f32 iso 50 and got the same 🙄

Yeah Don, I got exactly same as well at 50 seconds at F/1.8 with ISO 22,000. Then I took the lens cap off mate 😉

then the exposure it is taking is a function of iso also 😊

thats right, you took a great exposure of a black lens cap. 😁

we already know Dunnos answer as we have read it in every post. 😏

its not a factor of exposure and in fact less so than ISO, the scene is the scene period. we set and take the exposure to how bright we want the image.

Yes, you can use the ISO control on the camera to indirectly change the exposure by making the camera choose a different f-number, exposure time, and/or flash power, depending on the mode you're using, and it is those changes that alter the exposure. But the ISO setting, in and of itself, is not an element of exposure, anymore than your fingers or thumb, which you use to change the ISO setting, are part of exposure.

Exposure doesnt include scene light. exposure is shutter, and t stop.