So, I know the Hasselblad is still new (to me), but, I found an upgrade that I really needed to do. My 500c/m still had the original focusing screen in it. Which, having not ever used one before was ok, and I was able to see through it to what I was shooting, but, sometimes I felt that it was hard to find the focus correctly. So I went looking, and found myself a split-ring/microprism focusing screen. Well, this also sort of necessitated me moving to the Accute-Matte screen. Man, it is night and day difference.