« on: January 23, 2013, 04:14:31 AM »
I have a question that is of no consequence and will not change in any way my photo skills ( it'll take more than that.. ) but nevertheless it occupies my mind...
First , to provide some background to my (mis)understanding , I understand a lenses aperture expressed by it's f-stop to be something like focal length / aperture . OK all good.
But , when a zoom is constant aperture , the focal length changes throughout the zoom range ... So how does the aperture change to maintain the F number ? , I.e after using a 70-200 2.8 ,@ 200mm does the aperture max size suddenly become a lot smaller when moving towards the 70mm end ??.
I hope i have made my question clear...