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
The Crooked Eye The Crooked Eye The Crooked Eye is a 20-minute drama film short adapted, directed and edited by D. C. Douglas. It is based on the short story of the same name by Betty Malicoat. In 2009 the film won for "Best Animated Short" at the Red Rock Film Festival in Utah. "The Crooked Eye" follows a quiet woman through her daily drudgery while persistent memories of a recently unraveled marriage dreamily connect the guilty moments that made her world so unreal and unreliable. Linda Hunt ... Sharon's Narrator <br>Fay Masterson ... Sharon <br> Katherine Boecher ... Rosemary <br> D. C.