Graflex Stereo Auto User Guide

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Graflex Stereo Auto User Guide | Manualzz
 DIRECTIONS FOR OPERATING
Stereo Auto Graflex
Made only in 5 x 7 Size
FOLMER & SCHWING DEPARTMENT
EASTMAN KODAK CO. ROCHESTER, N. Y.
Directions for Operating the
Stereo Auto Graflex
FOCUSING Release the spring catch L, and raise the forward section
of top. Grasp handle and swing top back until Focus-
ing Hood is extended, then lock with side arms. Rack the lens out
with the focusing pinion S, which causes the lens cover to open т-
stantly, exposing the lens.
FOCUSING The prisms mounted in the Focusing Hood permit
PRISMS viewing the subject upon the focusing screen as it will
appear in the Stereoscope.
RISING AND The lenses may be raised or lowered to adjust
FALLING FRONT the required amount of sky and foreground by
turning the milled head R.
SETTING Press down the lever H until the mirror locks in
THE MIRROR focusing position.
THE CURTAIN The shutter curtain contains five apertures ranging
APERTURES from full opening O to % of an inch. When the
letter O appears at F, the shutter is wide open.
The other apertures, 1%, 34, 38 and %, follow in rotation at Е as key
A is turned to the left.
THE SHUTTER The metal plate X, attached to the side of camera,
SPEED PLATE gives the approximate shutter speeds, in fractional
parts of seconds, obtainable with the various com-
binations of curtain apertures and tension numbers.
SETTING THE Push down lever H. Depress the disc on H, turn
SHUTTER and set I opposite the slot, indicating instantaneous
exposure. Wind the curtain by turning key A to
the left, until the required aperture appears at F. If the curtain is set
at a smaller aperture than required, release the curtain by pressing but-
ton M backward until the proper aperture number is registered at F.
CAUTION A safety lock prevents the winding of the curtain before
the mirror is set in focusing position. This prevents
fogging of the film, making it necessary to set the mirror before rewind-
ing the shutter curtain.
REGULATING THE Tension on the curtain is regulated by turn-
SHUTTER SPEED ing the milled head B to the right until the
required tension number appears at G. The
numbers run from 1 to 6—the highest number indicating the greatest
speed. If the tension number is set at a higher tension than required,
release tension of spring by pressing escapement P, up and down, until
the proper tension number is registered at G. Example: for an exposure
xt. of a second, register curtain aperture 38 at Е, and tension No. 5 at СЦ.
INSTANTANEOUS After the shutter has been set, and the image
EXPOSURES on the Ground Glass Focusing Screen prop-
erly focused, the exposure is made by one
gentle, downward pressure of the release lever, located on the forward,
left-hand side of the camera body. The pressure on the lever simul-
taneously releases the mirror and curtain. Slow instantaneous exposures
of about + second can be made with the curtain set at O (full opening),
and tension No. 1. Pressure upon the shutter release causes the mir-
ror to rise just before the curtain drops, closing the recording plane.
TIME EXPOSURES Press down lever H. Depress the disc on H,
turn to right and set T in the notch opposite
the slot, indicating time exposures. Wind the curtain until the letter T
is registered at F. After focusing the image, release the mirror, and
commence the exposure by a gentle, backward pressure on button M.
At the expiration of the required time, terminate the exposure by a
second pressure on button M.
TO REMOVE Rack out the front extension with focusing head $
LENS BOARD and press the concealed button beneath the center
of extension front. Then swing the front of
extension upward.
ACCESSORIES All Graflex attachments will interchange with the
Plate Holders on Graflex Cameras. The Graflex
Plate Magazine is designed to carry 12 Glass Plates or cut Films in
metal sheaths; the Graflex Roll Holder takes the new Eastman Graflex
Film, consisting of 6 exposures; the Graflex Film Pack Adapter takes
the Premo Film Pack.
GRAFLEX EXPOSURE TABLE FOR VIEWS
Approximately Correct Exposures with Stop F.8
a with stops LARGER or SMALLER than F.8 should be respectively
ECREASED or INCREASED ONE-HALF with each succeeding larger | May June | Маг, Apr. [Jan, Feb.
or smaller stop used. July Aug. | Sept, Oct. | Nov. Dec,
Example=Third group— Ma rht—9 A.M. to 3 P.M,=160—F8.
Stop numbers F= | 4,5 la] 11 16 | 22 | 32
Relative exposure | 550 160 | so_| 40 | го | 10 РО LR
Table shows exposures with Graflex Film, Eastman Film, Seed 30 Plates. 3 ew Bew [2 pu PR vu (Seu
With Seed Graflex Plates, shutter speed can be increased one-third,
' Sates
| Landscapes Bright 5 |
Distant} Mountains Sun 350|16 an 110
Very a ne H 1 95 160 N
| now Scenes azy
| Open } River Views 0 75135} 60
Aviators in Flight Cloud
| 1 Dan| 80! 50] 65! 40] 50] as
Open Views from Train
Open) Roads & Fields|] Bright
me Ореп- Roads ields
Snow Scenes Sun 195110160 9 135 15
MES eee Views
Nearby }Vessch | Hay |110 во 90 sd 65] 40
> Light Buildings
h A Cloud
= A Events Dull’ 65 > 50 30 35 25
See from Grandstand
Open Park Views si ht
Snow Scenes with Ob] sen |160] sol135| 6011 10] so
jects Nearby
Large FiguresorGroups
in the Open x Hazy} 90] 50] 75 «0 65] as
Vessels at Wharf
Medium Buildings Cloudy d
Light Streets Dull 50) 25 40] 20 30) 15
Shady Park Views Bright
| Figures in Shade of Sua |110] sol 90] sd 80] 40
uilding or in Direct
Light with Dark or
Foliage Background || Нагу| 65| 35 50 20 40] 25
Dark Buildings
Light City Street Cloudy
Shady Porch Groups Dull | 35] 20] 30] 15 20] 10
Open Woods ь
Bright
Shady Driveway, Views] un 50 sd 40] 2 35] 20
an Overhanging
ai Hazy| 30 20 25] 14 20] 10
Usure a Piazza
10
Dark City Street vel 20 | 15 ¿| 10 !
DEPTH OF FOCUS
Depth of Focus or Field expresses the ability of a lens to give a sharply defined
image of both near and distant objects. It is impossible to secure speed and great depth of
focus at the same time, except with lenses of a very short focal length,
The degree of depth depends upon the relation between the focal length of lens and
stop used.
The depth of focus increases as the focal length of lens and diameter of stop decreases.
Focus a lens of known focal length upon a point at the hyperfocal distance of the stop
used and objects beyond one-half that distance from camera will be in focus.
Example=6% in, Lens— Stop F,16— Point of Focus, 44 ft.=Area in Focus, 22 ft.
from camera to infinity.
HYPERFOCAL DISTANCES
The following tables are based upon a circle of confusion of Го inch.
STOP F | 45 | 5.6 8 | 11 16 | 22 | 32
= = Fu Fr = | — | F | - 1 ” =
412 75’ 60’ 42" | ar 21 15’ | 13
© up 534" 112 90' 63’ 46 32! 23 | 16’
| 1 _ AL :
Ix] a
55 64%” 156' 126' 88' 64 44' 32 | 22
| En BE er Me _ | ААА -- =
Зо 75%" 208' 167' 117 85' 59' 43’ | 29"
2 — — ==
= gru” | 268’ 215' | 151’ 108’ 75' 55 | 38
When it is required that subject be sharply defined throughout Из area, focus upon
a point at the hyperfocal distance, in large figures on table, for lens and stop designated,
and objects from about one-half that distance—22 feet—from camera to infinity will be
in focus. With next smaller stop nearest object in focus will be about 16 feet.
The nearer the point focused upon the greater the loss in depth of focus, unless the
lens stop is decreased in diameter sufficiently to give the required sharpness to objects in
foreground and background.
Table showing the nearest and farthest objects in focus when focusing lenses of differ-
ent focal lengths, with stop F.8, upon a point at different distances from camera,
DISTANCE OF OBJECT FOCUSED UPON
STOP F.8 6 FT. 12 FT. 25 FT. | 50 FT.
= 447 | 637-847 | 94/17 | 16-62 | 23/—Infinity
O y 547 | 65719 | 10-15 18/—41/ | 28/—Infinity
ae 634 68/—777 | 10%/—13%/ | 194'—35 | 32/—116/
<6 ти” | 684/—76” | 11-13 | 20%/—32/ | 35/—88/
2 ви” | 69-757 | 1134/—12%/ | 21/30 (314758 =
GRAFLEX EXPOSURES FOR STOPPING MOTION AT
RIGHT ANGLES TO CAMERA
One-third less will stop motion at 45 degrees.
Two-thirds less will stop motion directly toward or from camera.
FOCAL LENGTH OF LENS Locos a a" |516"| 614" [136] 814”
T |
FEET
Pedestrians 25 1101135 160/235 350
Ww
ww
WA Carte =| 50] soj11o| 135]160| 195
Average Views | | 100] 90/110] 135/160] 195
© street Trae | „| 25] 235|295| 350/440) 550
и
6 Boating =| 50] 110|135| 160235] 295
E Children | =
Playing <100| 9O|110| 135/160] 195
5 ы
Athletics ME 25| 4401550! 6808251000
= Boat Races Fher 5
2=|2 50] 235/295] 350/440| 550
: Baseball So =
O Autos in Street| > | 5100] 1101135] 195/235] 295
Horse Racing 2 25| 6808251000 45°
| rn 825
Motor Boats AS
Diving =| 50 350/440] 550/680, 825
= | j =
y Views from | “| 100] 160235] 2951350! 440
A i TOWARD CAMERA
Ser | Auto Races | | 25|. 450550] 6808251000
Motorcycles ях 45°
=| 50] 6801825100032.
Aeroplanes =
Fast Trains | “| 100 350440 55016801 825
SUGGESTIONS
Find the subject group, and the exposure for movement at right
angles to camera will be found in the square on the line of “‘ distance of
object’’ and under “focal length of lens.”
Example :
Subject Motor Boat
Distance 50 Feet
Speed of Subject . 30 Miles per hour
Focal Length of Lens . 64”
Exposure .
++ th of a second
The shutter speeds given are necessary to stop the motion. The lens
opening must be regulated to meet the prevailing light conditions.
For bright days it is suggested that Stop F.8 be used with exposures
1}; to 5h05 F.5.6 with exposures 345 to sty; F.4.5 for exposures 515 to
1
1000:
On hazy or dull days, with same exposure, proportionately larger
lens openings should be used.
It is not advisable to operate the shutter at a higher speed than is
necessary to stop movement of the subject, thereby gaining the advan-
tage of full exposures and the ability to use smaller lens openings,
which will give greater depth of focus.
To decrease a given shutter speed % for movement at 45 degrees,
ог 73 for oncoming subjects, use the second lower speed on Graflex
exposure plate for "3 less, and the fifth lower exposure for 24 less.
Example:
Right angles #> 550
440
45 degrees; 14 less #> 350
295
235
24 less w> 195
160
Toward camera;
FOLMER & SCHWING DEPARTMENT
EASTMAN KODAK CO. ROCHESTER, N. Y.

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