Aperture size versus format question

Started Mar 13, 2013 | Discussions thread
Lenni Vilen
Regular MemberPosts: 138
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Re: Illustrated
In reply to EinsteinsGhost, Mar 13, 2013

EinsteinsGhost wrote:

Discussing Aperture Size:

The 135mm f/1.8 lens implies a maximum aperture (iris) size of 135mm/1.8 = 75mm.

I'm nitpicking a bit, but this is slightly wrong. Iris is the mechanical aperture of the lens. What you should be referring to is the entrance pupil (often also called aperture) which is the image of the aperture looked from the front of the lens.

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