Convert AOV from Focal Length / Focal Length from AOV (Maya)

convert_focal_aov.py

# Mayaで諸事情によりカメラスケール使えなかった時用に調べて書いた
# degreeとmmで計算してます

import math

def focal_to_aov(focal, aperture):
    '''
    focal: focal length
    aperture: horizontal aperture (mm)
    '''
    return math.degrees(2.0*math.atan((aperture*0.5)/focal))

def aov_to_focal(aov, aperture):
    '''
    aov: angle of view (degree)
    aperture: horizontal aperture (mm)
    '''
    return 1.0/(math.tan(math.radians(aov*0.5))/aperture)*0.5