How to use photographic exposure controls?


Photographic exposure controls let you adjust scene exposure in a similar way as when using a digital camera - this includes:



Where to find them?


Photographic exposure controls can be found in:

  • Render Setup > Camera > Postprocessing > Basic photographic settings > Use photographic exposure


  • Corona Camera > Photographic parameters > Use photographic (ISO)


  • 3ds Max Physical Camera > Physical Camera / Exposure rollouts



How to use them?


Generally, enabling and using the photographic controls is straightforward:

  • When rendering from a free (non-camera) view: 
    • Settings selected in Render Setup > Camera will always be used (depending on whether "Use simple exposure" or "Use photographic exposure" is selected).
  • When rendering from a Corona Camera: 
    • Use global exposure: 
      • If "Use simple exposure" is selected in Render Setup > Camera, then exposure is defined in there.
      • If "Use photographic exposure" is selected in Render Setup > Camera, then photographic settings of the Corona Camera will be considered.
    • Use simple (EV):
      • The EV value from the Corona Camera will be used. 
      • All settings in Render Setup > Camera are ignored. 
    • Use photographic (ISO)
      • Photographic settings from the Corona Camera will be used.
      • All settings in Render Setup > Camera are ignored. 


Note: when using exposure settings which do not consider photographic parameters, some values can still be used to determine how depth of field and motion blur should look (F-Stop and shutter speed). In such cases depth of field and motion blur appearance is independent from image exposure. 




Troubleshooting


Exposure (EV) slider is locked in the Corona VFB!

This most probably means that you are rendering from a Corona Camera (without "Use global exposure" option) or from a 3ds Max Physical camera. Currently the exposure value cannot be controlled interactively from the VFB when rendering from those camera types.