donderdag 13 november 2014
Aside from the magnification, the image of the eyes through positive lenses is different because of the centrifugal force in the lens. The optical effect may be best described as "swimming eyes". Negative lenses work in a centripetal way, putting an additional focus on the eye, even when the image of the eyes is tiny. Here Iris manages a focused look and there is nothing "swimming" in her eyes. Well done, Iris!
After this experiment, Iris was happy to return to the more familiar strong minus lenses. It's interesting to compare this portrait with the next portrait.