VRayCam to Standardcam (what settings divider?)

[lukx]

Question...If I need to use stadard max cam instead of vraycam and I alrady have all lights and exposure set upe for vraycam. What divider I need to use for vraylights (dome light when using or sky) (for it's intensity) to get same exposure with standard max camera?

[joconnell]

It's going to change depending on the iso, fstop and shutter speed - might be an idea to sample a pixel and get its rgb value / real pixel value from the vray cam, then switch to a normal cam and sample the same pixel, then it's straight division to get the factor you need to put in your colour mapping.