Ok, this requires some back story. On Friday, I saw Scott Kelby's behind the scenes of a sunglasses product shoot he was doing. I thought the final image was very cool, but I was disappointed to see his SOOC shot.
Notice the lens. The softbox in front is clearly visible. That nice gradient has been put in during post. I mean, I shouldn't be surprised, it's Scott Kelby, he can do that faster in Photoshop than he can press the shutter. But it got me thinking, how hard would it be to do that in camera? Here's the original, with just my basic Lightroom import and a global color adjustment:
It turns out, not very. I used the same basic lighting top and bottom for the rim light, but instead of a softbox in front of the glasses, I used some white foam core, held precisely in place to make sure that the full reflection of the glasses were covered by the foam core. Because it gets further away from the light towards the edge of the lens, the light falls off, giving it a nice, natural gradient. A little cleanup in post of the lens was all that's really needed.
Here's the setup shot: