On my Hasselblads I use either the waist level finder flipping up the magnifier on it or (now I have it) a PME 90 prism or the tower shape 'Magnifying Hood'....
.....which will be a) brighter and b) have more magnification enabling better focus....I have the image screen with the thick cross-hair on it not the Acute matte i think.....
.....which will be a) brighter and b) have more magnification enabling better focus....I have the image screen with the thick cross-hair on it not the Acute matte i think.....