2009

To find a lens's focal length:
■ To find the focal length of a lens based on changes in aperture width, open
the
Render Setup dialog on page 6067, choose Custom from the Output Size
drop-down list, and specify a value in the Aperture Width spinner. The
new value of the camera's Lens parameter is based on the new Aperture
Width value.
To display a camera's cone:
■ Turn on Show Cone.
The camera's field-of-view cone appears outlined in light blue.
NOTE A camera's cone is always visible while the camera object is selected,
regardless of the Show Cone setting.
To display a camera's horizon line:
■ Turn on Show Horizon.
A dark gray line appears at the level of the horizon in the camera's viewport.
5212 | Chapter 18 Lights and Cameras