Diving Straight into Photographic Rendering - Photographic Rendering with V-Ray for SketchUp - page 20

As a general rule, I prefer to handle exposure levels using only the film speed value
as much as I possibly can. This is due to the fact that it is the only one of the three
controls in what is often referred to as the exposure triangle that isn't used to con-
trol some other aspect of the physical camera model. Shutter speed is also used to
control motion blur while the F number (or F stop) value will typically be the control
mechanism for any Depth of Field ( DOF ) effects in our render.
To get some nice brightness levels in this instance, let's adjust the film speed or ISO
value and set it to 1200 . Taking another render by hitting the render button on the far
right of the V-Ray frame buffer's top toolbar will show us that our illumination levels
are now much more appropriate for the bright, airy feel we want to create.