42
CHANGING THE FOCUSING SCREEN-continued
Focusing Screen Selector Guide
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 A L
Type A: Matte Fresnel field with 3mm~circular split-
imagerangefinderspotand 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 B: Matte Fresnel field with 12mm~p fineground matte focus-
ing spot in the center. Good for general photography, especially with
long lenses.
Typo C: Fine-ground matte field with 4mmtclear spot and cross
hair. For photomicrography, astrophotography and other high-mag-
nification 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 R: Same as Type A but with rangefinder prisms of sloping sur-
faces 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
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
Typo J: Matte Fresnel field with central microprism focusing spot
and 1 Emmy circle. Good for general 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 pho-
tography.
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 ob-
jects or for measuring objects. Brilliant image in dim light. Suit-
able for close-ups, photomicrography and other high-magnifica-
tion 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 compo-
sition. Rapid and accurate focusing for subject with horizontal or ver-
tical lines or ill-defined contours. Suitable for general photography.
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