Would you changs aperture with camera move.

[JCPhoto1]

My question is about being in a studio and your near your subject and lights with a meter reading of f11. You would set your camera for that f stop. For the sake of argument if you were in a large studio and moved yourself back 20 or 30 feet from your setup would the taking aperture stay the same.

[Trevor Ash]

Yes, my taking aperture would stay the same, unless I'm concerned with any changes in DOF.

Are you trying to ask whether camera distance from subject affects exposure? It may affect DOF or field of view but it won't affect exposure assuming your body wasn't casting shadow/reflections.

[Asylum Steve]

Nope, as in no you don't. Yep, as in Trevor's right...

That's why an incident meter reading doesn't have to take into account camera position from the subject (assuming there are no obstructions between your subject and the camera lens).

In the context of a studio, the luminance of an object being lit remains constant enough that it will record the same regardless of camera distance.

[JCPhoto1]

From what I had been taught it doesn't make any difference but my partner who is a photography teacher at the local college and a 20 yr pro wedding photographer is convinced that there would be light falloff to deal with. I didn't have an effective argument to give him. On the surface what he said seemed like it could make sense but I never heard that you would have to change aperture. Thanks for the answers I'll give him the URL to this forum and he can see the answers for himself. Thanks

[Trevor Ash]

From what I had been taught it doesn't make any difference but my partner who is a photography teacher at the local college and a 20 yr pro wedding photographer is convinced that there would be light falloff to deal with. I didn't have an effective argument to give him. On the surface what he said seemed like it could make sense but I never heard that you would have to change aperture. Thanks for the answers I'll give him the URL to this forum and he can see the answers for himself. Thanks

That sounds like a good idea. There's probably just a misunderstanding somewhere and the teacher may be able to clear it up pretty quickly. Let us know the results.

[Trevor Ash]

Nope, as in no you don't. Yep, as in Trevor's right...

lol. I answered the question in his post rather than the one in his subject. Now I'm glad I didn't just say "Yes" with no qualification

[Asylum Steve]

...to hear the explanation.

The phenomena of light falloff is a factor of the subject's position in relationship to the light source, not the camera. If a subject moves away from either the front of or to the side of a light, falloff will be a factor.

But I'll say it again: for all practical purposes, the REFLECTED luminance of a subject will not change simply because you move the camera farther away. A handheld light meter does not take into account camera position.

Of course, if you're only lighting your subject with single light, as you move farther away (assuming the same focal length lens), light falloff will probably make the OVERALL SCENE darker, but the exposure for your subject would still be the same.