MichaelM
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Hello,
I would like to understand how the relative illumination charts are created.
Example:
http://www.edmundoptics.de/images/articles/fig-1-rs.gif
I suppose that it is done, by rotating a lens with respect to a constant light source. However, in articles realted to relative illumination I often find references to the cos4 law, which, if I get it right, refers to looking at a "wall" with labertian radiance beahviour. I also read, that the cos4 law does actually not reffer to the object side of the lens, but the image side.
As you can see, I am quite confused. So, please help me understand.
I would like to understand how the relative illumination charts are created.
Example:
http://www.edmundoptics.de/images/articles/fig-1-rs.gif
I suppose that it is done, by rotating a lens with respect to a constant light source. However, in articles realted to relative illumination I often find references to the cos4 law, which, if I get it right, refers to looking at a "wall" with labertian radiance beahviour. I also read, that the cos4 law does actually not reffer to the object side of the lens, but the image side.
As you can see, I am quite confused. So, please help me understand.