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Some additional calculations based on these factors:
Field Size, FLT98 and Canon 50D
Flat IV, mid setting, 103.5' x 69.1' (1.73 x 1.15 degrees)
Native, 124.2' x 83.0' (2.07 x 1.38 degrees)
DG-L, 139.18' x 93.0' (2.32 x 1.55 degrees)
Flat III, 154.4' x 103.2' (2.57 x 1.72 degrees)
In other words, the Flat III has almost a 50% wider field than the Flat IV.
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