PR-655/670 User Manual
69
In the following
example, let’s say a projector screen, the light incident on the surface is illuminance, and the
light being reflected from the surface is luminance.
FIGURE 63 - ILLUMINANCE / LUMINANCE CONCEPT
H
OW TO
M
AKE A
L
UMINANCE
/
R
ADIANCE
M
EASUREMENT
If using an objective lens, the first step is to align and focus the optical system (lens and eyepiece) on the target.
FIGURE 64 - MS-75 LENS
Grasp here to install or
uninstall lens.
Lens focusing ring
