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photometry
luminous flux transmitted through an aperture


luminous flux from a small light source transmitted by an optical system


Caution
Fill in all input cells.
Choose all parameters unit.
D and the light source are supposed to be small compared to x.
All parameters are positive.

InputValueunit
S
L
D
x
T
OutputValueUnit
Fto be calculated
luminous flux from a small light source transmitted by an optical system
S : light source area L : radiance of the light source D : aperture diameter of the optical system x : algebric distance from the primary principal plane of the optical system to the light source T : transmission of the optical system F : luminous flux transmitted by the optical system

Note
This calculation page can not detect all unrealistic inputs.



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