I was using SL66 (the camera about three kgrs.) and "45 degree prism"f/4 1/60 with a magazine 6x4.5 TMAX 100, and not the usual Waist Level and 400 ISO, dificult to get sharpness, precision ... with focus at some situation, portrait with SL66 and "45š degree" i donīt like Likely with hand-holding. IMHO waist level is far better, it could help a 400 iso film and not 100... thanks