New answers tagged studio-lighting
If your diagram is to scale, the distance from the background flash to the backdrop is significantly less than the distance from the main flash to the subject. This could well be why the backdrop is so bright and causing the light bleed you are seeing. The first thing I'd try is use a flash meter to compare the light hitting the subject with the light ...
Have you considered a "green screen" solution? It's common in the video realm, and I believe Photoshop has a tool to do this. More sophisticated versions can address color spill (when the reflection from the green screen causes the foreground object to be tinged green at the edges) and preserve shadows.
You would probably be better off shooting a product photography tent. Go 2 stop higher for background of tent, then use flags on the flash to light the powder. I would suggest using 2 lights, one at each side, with less power on one of them to give you shadow.
This is mostly guess work, but if you can use the backlit glass against a solid white you might be able to take a few shots and combine them in photoshop. For the first shot (image A), turn the backlight off and shoot the shot you would like to use. For the second shot (image B), turn the backlight on, and really underexpose the image. This will give you ...
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