Is there any relation between barrel size and aperture?


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Madmax

Senior Member
Nov 22, 2003
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Just a newbie question.

Some lens are 58mm, 62mm, 67mm, etc. Is there any correlation between that and the max aperture size?
 

roti_prata

New Member
Jul 31, 2005
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Bt Batok
1st u hav to understand tt apature no.(f/xx) is a relative concept. its the ratio of lens opening and focal length. so the same sized barrel with same sized opening can mean different apatures at different focal lengths, which is wat u see in most zoom lenses. as it zooms in, the focal length increases but the lens opening stays the same size, so apature no. becomes smaller
 

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