If you've ever shot a portrait of someone wearing glasses, you know it can be a particularly infuriating experience. Instead of resorting to posing tricks or wasting time correcting the glare in Photoshop, understanding the simple physics behind why these reflections occur can enable you to quickly and effectively eliminate them.
In this great video, Joe Edelman demonstrates the physics behind angles of reflection. Simply put: the angle at which incoming light strikes a surface is the angle at which it will exit the surface. If your camera aligns with the angle of reflection, you'll see glare. In the case of eyeglasses, this is complicated by the fact that the curved lenses create multiple angles of reflection, though the underlying physics is the same. While removing the glasses is always an option, some people prefer the way they look with them, or you might need them for the specific shoot you're doing. Thankfully, Edelman walks us through a number of lighting setups with different modifiers and demonstrates what makes reflections appear and how he gets rids of them. It all boils down to three tips:
- Change the position or angle of the light.
- Change the position or angle of the subject.
- Change the position or angle of the camera.
That's it! No special tricks or complicated Photoshop maneuvers. As a bonus, Edelman gives us this great reminder: "All great photography is an act of problem solving." Get out there and embrace the eyeglasses!
[via DIY Photography]