im lookin at this now likepic.twitter.com/SrmyiuQg86
Czech photographer Dan Vojtech conducted a fascinating experiment to show how focal length can change the shape of a person’s face.pic.twitter.com/egXfFP78Dh
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Object focal length of the eye = 16.7 mm Image focal length of the eye = 22.3 mm The object focal length is for rays coming out. For an image on the retina, the image focal length is what one wants. This explains the commonly cited ~17mm, but the correct value is ~22 mm.
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im so confused is it 22mm or 50mm?? ;-;
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This explains a lot about my passport photo.
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Indirectly at least
the perspective change comes from the distance to the subject, the focal length crops the field of view so we have to move closer for the same framing. If we changed focal length and nobody moved, he'd look the same but we'd have to manually crop 
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ah yes, from sympathic/intimate to mugshot.
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bruce_banner_becomes_the_hulk.gif
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