Nikon F2AS

42

CHANGING THE FOCUSING SCREEN-continued

Focusing Screen Selector Guide

Type A L

Type A: Matte Fresnel field with 3mm~circular splitimagerangefinderspotand 12mm~circle. Rapid and accurate focusing.

Excellent for general photography.

Type L: Same asType A screen but with split-image rangefinder line at a 45

°

angle. Best for subjects with horizontal lines

Type H:

Clear Fresnel field with microprism focusing pattern over the entire screen area. Permits rapid focusing on any part of the screen with optimum edge-to-edge brightness in poor light. Availabje in four models (Hl-H4) corresponding to part~cular focal length lenses

Type B

: Matte Fresnel field with 12mm~p fineground matte focusing spot in the center. Good for general photography, especially with long lenses.

Typo J:

Matte Fresnel field with central microprism focusing spot and 1 Emmy circle. Good for general photography.

Typo C: Fine-ground matte field with 4mmtclear spot and cross hair. For photomicrography, astrophotography and other high-magnification applications, and for parallax focusing on aerial images

Type D:

Overall fine-ground matte field. For spocialized close-up photography and for use with long lenses

Type E:

Matte Fresnel field with Ammo fine ground matte spot and etched horizontal and verti cal lines. Ideal for architectural photography.

Type K:

Combination of Type A and J screens. Matte Fresnel field with 3mm’split-image rangefinder spot surrounded by Imm-wide microprlsm doughnut. Rapid and accurate focusing for subjects with both straight lines and ill-defined contours. Suitable for general photography.

Type M:

Fine ground Fresnel field with S.Smm clear spot and double cross hair for use in parallax focusing on aerial image, plus millimeter scales for calculation of individual magnification of objects or for measuring objects. Brilliant image in dim light. Suitable for close-ups, photomicrography and other high-magnification applications.

Type P:

Same as Type K but with split-imago rangefinder line at a

45

°

angle amd etched horizontal and vertical lines as an aid to composition. Rapid and accurate focusing for subject with horizontal or vertical lines or ill-defined contours. Suitable for general photography.

Type, G:

Clear Fresnel field with extra-bright 12mm~ microprism focusing spot for viewing and focusing in poor light Four models

(Gl-~;4) are available corresponding to specific focal length lenses

Depth of field cannot be observed.

Type R:

Same as Type A but with rangefinder prisms of sloping surfaces at a smaller angle and horizontal and vertical lines to aid proper comPOsition. Works best with lenses having maximum aperture of from f/3.5 to f/5.6