On Jul 31, 2012, at 9:26 PM, Graeme Gill wrote: > Iliah Borg wrote: >>> how one could eliminate any glare originating _inside_ the lens? >> >> By using no lens. > > A pinhole doesn't work so well though, due to diffraction. Diffraction matters little when the patches are presented one by one. > You've also got light bouncing off the sensor/film itself. Very little if the chamber is clean and there are no glass elements. -- Iliah Borg ib@xxxxxxxxxxx