AJA FS2 - Manual (Page 158)

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SD Aspect Ratio SD Aspect Ratio selects the type of SD-to-SD Aspect Ratio Conversion (ARC)
performed on an incoming selected SD source. This parameter is in effect only
when the input and output are both SD (525i or 625i). (In Europe 16:9 anamorphic
video is also known as “wide screen” video.)
(8) SD Aspect Ratio Selections Selection Descriptions
Off (default)
Letterbox
H Crop
Pillarbox
V Crop
14:9
Turns aspect ratio conversion Off.
Converts 16:9 Anamorphic video to Letterbox video.
Converts 16:9 Anamorphic video to 4:3 Standard video (crops left and
right edges of video).
Converts 4:3 Standard video to 16:9 Anamorphic video.
Converts Letterbox video to 16:9 Anamorphic video.
Converts 16:9 Anamorphic video to 14:9 Cropped video.
SD Aspect Ratio Conversion Illustrations
H Crop
Pillarbox
V Crop
14:9
Off
(no conversion)
Letterbox
4
3
4:3 Converts To These displays on 4:3