Canon Model 7S - Manual (Page 75)

FILTERS
There are various types of 40mm (for 50mm F 1.8), 48mm (for 50mm F 1.4', 55mm (for 50mm
F 1.2), and 72mm (for 50mm F 0.95) screw-in type filters used for special effects with black and
white and color films.
FILTER
FACTOR
TYPE FILTER CHARACTERISTICS
4
8
UV (SL39 • 3C)
for black & white and color
1.5
2
Y1 (SY44 • 2C) >1
Y3 (SY50 • 2C)
01 (S056-2C)
R1 (SR60 • 2C)
Gl (MG55-C)
for black &
white
Skylight
N0 4
N0 8
(for black & white
j and color
Color Conversion A
Color Conversion B
for color
Absorbs only ultra-violet rays. Especially effective at
seaside, high mountains where there is much ultra violet
rays. Recommended for use in color photography.
Increases contrast of black & white film. Enhances clouds,
lightening the blue sky. Brightens red and yellow.
Darkens blue, increases yellow and red values percep­
tibly. Good for contrasts in distant landscapes.
Makes strong contrasts. Renders day almost into night.
May also be used with infrared film.
Prevents red from turning radically into white. Lightens
sky and face appropriately, and reflects the lightness of
fresh greenery.
Acts to harmonize the blue sky and shade.
ND 4 reduces light vaiues by 1/4, ND 8 by 1/8. No effects
on the reproduction of colors of color film.
Color film filter for conversion of color temperature when
photographing tungsten type film under sunlight.
Color temperature conversion filter for use with daylight
type film under tungsten light.
40 72mm Filters: UV, Y3, Rl, Skylight, CCA, and CCB only.