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Forums > Back > New Nikon AF-S 70-200mm f4 VR without the focus breathing
nuke12
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#42
01-27-2013, 05:27 PM (This post was last modified: 01-27-2013, 06:55 PM by nuke12.)
I'm not big on word play. Call it effective focal length, interpreted focal length, apparent focal length, whatever? It comes from this formula;



D = sensor size horizontal width in millimetres (36mm used)

f = effective focal length in millimetres

a = horizontal angle of view



f = D/(2*(TAN(a/2)))



That is this formula transposed.



a = 2*ARCTAN(D/(2*f))



The first formula on the wiki page for angle of view.

http://en.wikipedia.org/wiki/Angle_of_view



EDIT: Typo. Changed 35mm to 36mm for the 36x24 full frame format.
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Messages In This Thread
New Nikon AF-S 70-200mm f4 VR without the focus breathing - by peterottaway - 10-26-2012, 12:36 AM
New Nikon AF-S 70-200mm f4 VR without the focus breathing - by peterottaway - 11-07-2012, 04:52 AM
New Nikon AF-S 70-200mm f4 VR without the focus breathing - by nuke12 - 01-27-2013, 05:27 PM

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