Nikon F4 - Manual (Page 142)

6X High-Magnification Finder DW-21
For critical high-magnificalion close-up work and photomicro­
graphy. Its sophisticated optical system provides a clear, sharp
view of the entire image at full approx, 6X magnification. Fitted
with a -5 to -I-3 diopter adjustment for individual eyesight
correction, plus a rubber eyecup and rubber eyepiece cover.
Waist-Level Finder DW-20
For use when the F4 is used at a low angle or on a copystand.
Fold-up-type viewing hood provided. The built-in flip-up mag­
nifier provides an approx. 5X magnification on the center of the
image for accurate focusing.