The Recent F/stop Controversy

Started 1 month ago | Discussions thread
mamallama Forum Pro • Posts: 55,572
Re: The Recent F/stop Controversy

J A C S wrote:

bolt2014 wrote:

The post about getting rid of the "F/stop" definition turned into such a technical subject that most photographers become lost in the jargon. I think that too many photographers become so embroiled in the technical aspects that they forget that photography is more about being creative .

I do not think we have started yet with the technical aspects. How about this (Wikipedia):

As Rudolf Kingslake explains, "It is a common error to suppose that the ratio [D/2f] is actually equal to tan θ, and not sin θ ... The tangent would, of course, be correct if the principal planes were really plane. However, the complete theory of the Abbe sine condition shows that if a lens is corrected for coma and spherical aberration, as all good photographic objectives must be, the second principal plane becomes a portion of a sphere of radius f centered about the focal point".[4] In this sense, the traditional thin-lens definition and illustration of f-number is misleading, and defining it in terms of numerical aperture may be more meaningful.

Now you have opened Pandora's Box  for those who want to outdo the Equivalent genius. 

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