Diaphragm (optics) curved blades improve the roundness of the iris opening. In a photograph, the number of blades that the iris diaphragm has can be guessed by counting the number of diffraction spikes converging from a light source or bright reflection. For an odd number of blades, there are twice as many spikes as there are blades. In case of an even number of blades, the two spikes per blade will overlap each other, so the number of spikes visible will be the number of blades in the diaphragm used. This is most apparent in pictures taken in the dark with small
Diana Vreeland: The Eye Has to Travel stylish doc should enjoy a nice arthouse run before becoming an essential presence on the DVD shelves of fashionistas everywhere.” Writing for "Variety", Jay Weissberg says, “Few names conjure ‘style’ with the zest of Diana Vreeland, and documentary "The Eye Has to Travel" gets the zing just right.” Currently, the film has a rating of 95% on Rotten Tomatoes, based on 63 reviews and an average score of 7.2/10. Diana Vreeland: The Eye Has to Travel Diana Vreeland: The Eye Has to Travel is a 2011 documentary about the life and career of Diana Vreeland, a fashion legacy famous for