Runco LS-3 Series Installation & Operation Manual page 59

Table 4-2. Aspect Ratio Settings (continued)
Aspect
Ratio Description
Setting
Letterbox mode scales
(zooms in on) a 4:3
image linearly (by the
same amount on all
Letterbox
sides) to fill a 16:9
display, cropping the top
and bottom of the image.
4:3 Narrow linearly scales
the source active image
4:3 horizontally, so that a 4:3
Narrow source has the correct
aspect ratio when using
an anamorphic lens.
Runco LS-3/LS-5 Installation/Operation Manual
Aspect
Ratio of
With Standard Lens
Source
(1.78:1 Screen)
Signal
16:9
4:3
16:9
4:3
43
Geometry of Projected Image
With Anamorphic Lens (2.35:1 Screen)
Operation