| http://www.w3.org/ns/prov#value | - eye remains the same.There we have the smaller aperture BUT the shorter FL and smaller sensor as well, so the area brightness of the image created by 18mm f 1.8 lens shall be the same as with FF equivalent - 50mm f1.8 lens assuming the same light transmission of the optics.So: such lens would behave as 50mm f 4.9 regarding FOV and DOF, but it would give You the same shutter speed as 50mm f 1.8 FF
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