Honestly speaking, i hate to use my Hasselblad 501CM because of the focussing screen, i have one came with the camera and i bought another one alone, both i think are Acute, but i think the second i bought separately is Acute Matte-D, but to my surprise and disappointment, both are not doing a great job, focusing the camera which each making me crazy, i can never tell if the focus is spot on and very difficult to be sure, my RZ focusing way is like a charm, i always can tell when the focus is dead on, but with Hasselblad i just hope/pray to be lucky that the focus is on as i want, and weird i bought that second Acute Matte-D screen according to many recommendations, but nothing help me at the end.