Daniel Heineck wrote: ... Now, for the math geeks amongst us, we could do some ray tracing and find out the propagation characteristic of a parabolic reflector setup with reasonable accuracy.
It will show that collimated light from a parabolic reflector - necessarily created from a point source - is itself a point source. As such, it obeys ISL (a matter of light intensity), but NOT the geometry of apparent size (size is zero). In this lighting behavior, the para is equivalent to a planar mirror as reflector. I have the Profoto Narrow Beam, a shiny parabolic: standing at the receiving end and moving my head around, the point source moves around the reflector. Pics from C.D.E. show the lack of stray light, and quite unlike a white surface that generates a light source both diffused and of non-zero size.
Aug 13, 2009 at 01:12 PM
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