Comparing Olympus 4/3lenses to FX "Full Frame" offerings

Started Jan 25, 2014 | Discussions thread
mapgraphs Senior Member • Posts: 1,052
Maximum Aperture

Ian Stuart Forsyth wrote:

Doctor Lecter wrote:

I beg to differ. *You* can remain ignorant on the subject if you wish... DOF changes, but fstops/apertures are the same regardless of sensor size. It's simple physics — the amount of light passing through the lens.

Exactly physics, the 50mm F2.8 has a larger front element than the smaller 25mm F2.8 front element now are you going to try and convince me that the same amount of light will pass thru the smaller 25mm F2.8 as a 50mm F2.8. Has the 25mm F2.8 have some special power that allows it to suck more light thru its smaller opening.


Yes, to get a f/2.8 maximum aperture on a 50mm focal length lens, the front element is going to be larger than that of a 25mm focal length lens with a maximum aperture of f/2.8. The size of the element is about the maximum aperture per THE FOCAL LENGTH.

It's not about how many more photons go through crystal as compared to graphite or coal.

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