Barry I didn't do it with a flash, I did it with a fixed light source - therefore I didnt have to think about the angles, just looked through the camera at the light source with the polarizer on until it turned black.
instead of using flashes, can you set up two light sources at 45 degree angles with polarizing sheets on them? Ann (member of PDML and Nature Conservancy too :) ) Barry Rice wrote: >Hey Folks, > >Has anyone on this list experimented with cross-polarization flash >techniques? Basically, you put a linear polarizing sheet in front of your >flash, and a linear polarizing filter in front of your lens. Orient the two >filters at 90 degrees to each other. With this arrangement, light from the >flash is polarized. Specular reflections off the subject are still polarized >and as such are blocked by the lens on the camera. > >This supposedly eliminates hot spots. Since a lot of my photography involves >plants with waxy, shiny surfaces, this would be very useful. > >Of course, the down side is that the flash is less powerful with all that >polarizing sheet. > >Does this work? I've encountered it a couple of times in macrophotography >books. > >Barry A. Rice, Ph.D. >Invasive Species Specialist >Global Invasive Species Initiative >The Nature Conservancy >V: 530-754-8891 >http://tncweeds.ucdavis.edu > > > > > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
