DSLR Passport Photo Preset ISO 200 to minimize noise. Excessive noise is one reason a photo can be rejected. f/8 for sharpness and depth of field. Blurriness is one reason a photo can be rejected. 1/250: I used the sync speed to eliminate the ambient light (in this case from a window that might have shown shadows on her face). http://betterfamilyphotos.blogspot.com/2011/06/diy-passport-photos.html