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Comparison of rectilinear versus rectilinearized 111° hAOV of
    Sigma AF 12-24 mm f/4.5-5.6 EX DG zoom @ 12 mm
    Canon EF 15 mm f/2.8 fisheye and 
    Sigma AF 8 mm f/4.0 EX fisheye
on a Canon EOS 5D

Start - Centre - APS-C edge - Edge - Summary


Centre

Sigma 12-24 EX

Canon EF 15 mm

Sigma 8 mm EX

f. 2.8


f. 4.0
or
f. 4.5

f. 5.6
f. 8.0
f. 11
f. 16



Software for remapping fisheye
images into a rectangular projection