Thanks for the tip Ken. Fortunately for me, my filter problem has been rectified. Possible diffraction aside, it seems to me that would have a dramatic effect on the light rays entering the lens. Have you ever used that camera with the f90 cap on? Greg Fraser > -----Original Message----- > From: Ken K [mailto:kenkagawa@hotmail.com] > > In reply to the ND filter thread. > I was playing with an old Polaroid 110b folding camera last night. > It has a flip up lens cover which incorporates an approx. 2mm > pinhole . > The Rodenstock lens ranges from f4.7 to f45.When a faster > film is used,you > are instructed to flip up the lens cover w/pinhole and shoot with the > aperture diaphragm wide open.The pinhole f stop becomes f90. > This might be an easier solution for the person hunting for large ND > filters. > KenK
