AJA FS1 Version 2.2.0.47 - Manual (Page 58)

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5.3 SD Aspect Ratio Convert
This parameter selects an SD-to-SD aspect conversion mode for converting between
normal 4:3 SD video and either 16:9 Anamorphic SD video or Letterbox SD video.
(In Europe 16:9 Anamorphic video is also known as “wide screen” video.) See the
following illustration for aspect ratio conversion visual examples.
SD Aspect Ratio Conversions
5.3 SD Aspect Ratio Convert Description of Choices
Parameter Adjustments:
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—FS1
H Crop
Pillarbox
V Crop
14:9
Off
(no conversion)
Letterbox
4
3
4:3 Converts To These displays on 4:3