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== Theory Discuss ==
I like the argument presented here: The FT of a uniformly illuminated circle creates an airy disc, therefor the FT of an airy disc is a uniformly illuminated circle. However, in this discussion there is the term: kr tan(Θmax), but I believe it should be kr sin(Θmax) to match what the FT of a circle aperature is. Is there a reference for the expression of kr tan(Θmax) used in this article? [[User:Maqifrnswa|Maqifrnswa]] ([[User talk:Maqifrnswa|talk]]) 04:57, 16 March 2013 (UTC)
== Theory: explanation of θ_max,r required ==
I think adding a ray diagram explaining terms like '''θ_max''' and '''r''' will be more helpful in understanding the process of partial interception of spherical wave field by lens. For example, '''r''' described as "..r is radial distance in the image plane.." does not clarify which radial distance has been mentioned here.
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