Hasselblad Negative Correction Diopter for PME90 (-4.5 to -2) - The Hasselblad PME90 prism viewfinder has built-in, adjustable diopter correction. The standard range of adjustment is -2 to +0.5. There are two optional diopters available for this viewfinder to "extend" the range of adjustment in either the minus or the positive direction.
Note! This diopter fits the PME90 viewfinder and will give it a diopter adjustment range of -4.5 to -2