What does the 1 mean in 1:1.8?

Started Jun 22, 2012 | Discussions thread
fireplace33
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Re: What does the 1 mean in 1:1.8?
In reply to Barrie Davis, Jun 24, 2012

Yes, thanks, that is just what was explained in the wikipedia article about entrance pupil.

"The entrance pupil is the image of the physical aperture, as seen through the front of the lens. The size and location may differ from those of the physical aperture, due to magnification by the lens." /

so, somewhat behind the aperture blades.

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