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p.1 #5 · p.1 #5 · 19 mm PCE equivalent focal length at full Shift  
ljkamler wrote:
Approx. 11.4mm when in landscape orientation and shifting left and right according to this:
Nikon reports the FOV based on the diagonals. For example, the 19 PCE has a 97 deg FOV. Here's the math.
Diagonal of 24x36 sensor is 43.3 mm
Half of that is 21.65 mm
Arc tan of 21.65 / 19 = 48.7 deg
Double that is 97.5 deg
For a shift lens, you no longer have a 3:2 aspect ratio so does it still make sense to use the diagonal? Cambridge says no and the values from their calculator are based on the height or width of the stitched picture, not the diagonal.
For comparison, if you are in landscape mode and shift up and down, the effective focal length is 14.3mm.
