Camera exposure question

[Neilg]

I've got a scene which i've set up with standard lights and values so that my scene looks how I expect it to when rendered with exposure turned off/from perspective view.

But I want to use white balance, and it doesnt work with exposure off.

Does anyone know what the f-stop/shutter speed/ISO is to get the physical camera working exactly the same as a standard?
I could do it by trial and error but it seems like something that should be documented somewhere.

edit: found it
f-stop - 16
shutter - 10
ISO - 730

[RErender]

I'd recommend Lele's auto exposure script

[Neilg]

I dont want to use the auto exposure result, I want what the standard camera outputs.

[Neilg]

For anyone interested:

f-stop - 16
shutter - 10
ISO - 730

That seems pretty much exact.

[raymarcher]

thanks, this is usefull, a cool feature would indeed be a non exposure color balance

[^Lele^]

Eric is right
He just didn't mention that you'd want your scene hidden, and a reference white (255) card lit with a direct light at 90deg angle.

< * |

cam light card

Then either use the exposimeter, or colorpick the physcam render to know the EXACT iso/shutter speed multiplier for it.
There is no "exact" setting, however.
One will have the need for more blur (longer exposure) and another for more DoF (higher F number), so the ISOs will vary accordingly.

[^Lele^]

thanks, this is usefull, a cool feature would indeed be a non exposure color balance

Photoshop?

[Neilg]

Eric is right
He just didn't mention that you'd want your scene hidden, and a reference white (255) card lit with a direct light at 90deg angle.

< * |

cam light card

Then either use the exposimeter, or colorpick the physcam render to know the EXACT iso/shutter speed multiplier for it.

Yeah but now that i've done it by sampling the values/trial and error, it's just a question of typing in 3 values which I have on my desktop. Dont get me wrong - I like your exposomiter, but finding and installing it then doing that is more work than I ended up doing.

The reason I wanted white balance in the render was to turn the sun off, sample the colour value of my wall and balance against that to get them white again. I'll be colour correcting in photoshop later, but it helps to render without a blue cast over everything.

[^Lele^]

Forget the exposimeter.
The method holds with one colorpick from the physical camera render, and one ISO multiplication.
Exact, not guesswork, and allows for complete freedom with F and Shutter Speeed settings.