Assertion: maximum aperture | /r/HasProperty | diameter of the lens opening
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Source sentences:
text: As this lens is extended to 200 mm, the maximum aperture becomes 5.6 because the lens becomes longer and when you divide the maximum aperture (diameter of the lens opening) into the longer focal length to determine the F-stop - the best it can produce when the lens is extended is F5.6 (see below for an explanation).