Focusing screen selector guide – Nikon F4 User Manual
Page 145
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Focusing Screen Selector Guide
Type B
Matte/Fresnel field with 5mm-dia. and 12mm-dia.
reference circles and focus brackets. Good for general
photography.
Type U
Matte/Fresnel field with 5mm-dia. and 12mm-dia.
reference circles and focus brackets. Suitable with
telephoto lenses longer than 200rmm.
Matte/Fresnel field with 5mm-dia. and 12mm-dia. ref
erence circles and focus brackets. Suitable with reflex
lenses and telephoto lenses longer than 400mm.
Type C
Fine-ground matte field with 5mm-dia. clear spot and
cross hair. For photomicrography, astrophotography
and other high-magnification applications using
parallax focusing on aerial images.
Type M
Fine-ground Fresnel field with 5mm-dia. clear spot
and cross hair for use in parallax focusing on aerial
images, plus millimeter scales for calculation of in
dividual magnification of objects or for measuring
objects. Brilliant image in dim light. Suitable for close-
ups, photomicrography and other high-magnification
applications.