Film cameras
Air Force Gun Sight Aiming User manual
User manual for Air Force Gun Sight Aiming. 11 pages in English. Read the original PDF, download or print a copy without registration.
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- Brand
- Air
- Model / document
- Air Force Gun Sight Aiming
- Document type
- User manual
- Language
- English
- Pages
- 11
- File size
- 5.1 MB
- Category
- Film cameras
- Document date
- Not specified in catalog
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Page 3 · Read text
Instructions for Operating
U. S. Arrny Air Force
Gun Sight Airning Point 16rnrn. Carneras
(GSAP) Types N-4 and N-5
The camera types differ only in lens hazard, burnt-out motor, etc. A
equipment, as follows: description of porver connections and a
Camera l/oltage oJ wiring diagram appear on page 6.
Tylrt Motor Lens
N-4 24-volt 35mm., plairr LOADING THB CAMERA N-5 24-volt 35mrn.. 90" The GSAP Camera uses film which erectlng systeln is pre-threaded in metal magazines. To
load the camera, lift the spring latch A,
POWER Figure 1, and open the door. Insert the film magazine B, Figure 1, as illus-
The Bell & Howell GSAP Catncra is trated, making certain that
driven by an electric motor. A thern-ro- (1) the opening in the film magazine
stat automatically cuts out the motor if gocs in first;
improper threading of the film maga- (2) the pin on the edge of the maga-
zine, or any other factor, should cause zine faces arvay from the cable re-
the film to jam, thus eliminating frre ccptacle; and,
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s,
II
t
:
F
I Figure I
Inserting filrn rnaga zine
A. Door latch B. Filrn rnagazine
.l
,t
li
1!t:l-View original page 3Page 4 · Read text
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email=mike@butkus.org, c=US
Date: 2020.03.14 19:39:49 -04'00'butkus
Figure 2
C. Speed control knob G. Lens
D. Speed index rnark H. Lens sheath
E. Footage indicator knob J. Lens rnounting strrds F. Footage dial K. Lens heater pin jacks
(3) the footage dial on the rnagazinr: FOOTAGE INDICATOR (which is not used i r this canera) is
'i iie footage dial on the GSAI, toward the outer face of the camera.
and not toward the interior. Push the Camera is external; the dial on the
is not used. When the loaded magazine forward until there is an magazine
audible click; then close the door. camera is ready for operation, turn the
indicator knob E, Figure 2, until the
lootage dial F, just below, indicates 0,
SPEED CONTROL if a full magazine is to be used. lf the
film magazine is not full, set the indi- This camera operates at any one of
cator to correspond with the figure on 3 speeds 76, 32, or 64 flrames (ot - the magazine footage-indicator dial. pictures) per second. Thc motor Hencelorth during that film run, thc operates at a constant speed, and the dial will indicate the amount of filrn various camera speeds are achieved b1' stil I remaining unexposed. changing the gear ratios. To set the
camera speed, turn the speed control
knob C, Figure 2, until the index mark THE LENS for the desired speed figure on the dial
is opposite the fixed index mark D, I\Iethod of Mounting. The Lens G,
Figure 2, on the camera. Figure 2, is permanently mounted with-
in the heavy, protective, sheath-and-
IMPORI'ANT z Do not change speed while flange unit H, Figure 2. The lens is
thc camera is in opcration. mounted on the camera by fitting the
'2.View original page 4Page 5 · Read text
single index mark O, Figure 3. Collar Q
rotates, and bears the exposure s)'m-
bols B, H, D, and 3.5 on its rear edge
M, Figure 3, and the camera speed
figures 76, 32, and 64, on its forward
edge N, Figure 3. Collar R is the dia-
phragm adjustment. It also rotates,
bearins the single index mark L,
Figure 3.
To sct the lens, rotate collar Q until
thc indcx mark for the desired camera
speed N, Figure 3, is opposite the fixed
Figure 3 index mark O, Figure 3. Then rotate
collar R, until the diaphragm index
Detail of lens adjustrnerlt. Lens rnark L, Fieure 3, is opposite the sym-
(with 90" erecting s.vstern) is set for bol for thc light conditions of the
eamera spet:d of 16, rrnrler dull light- rrroment. The lens shown in Figure 3
ing conditions is set for rvork at 16 frames per second
on a dull duy. Figure 4 shows the plain
L. Diaphragm intlex rnark lens set for operation at 64 speed on a
M. Exposure syrntrols for lighting hazy duy. conditions
N. Carnera speed figures
O. Fixed index rnark
P. Fixed index collar
Q. Rotating speed and light collnr R. Rotating diaphragrn colllr
S. 90" erecting systern
flange over the three dowel studs .f,
Fieure 2. When changing lenses, ttse
the wrench Y, Figure 7, and be sttt'e
that the flange is flush with the catrtet':r
housing before tightening the nuts otl
the dowel studs.
Adjusting the lens. Both types of
lenses are 35mm. in focal length, with a
maximum aperture of f i3.5. Each type
is adjusted in the same manner. Two
lens adjustments are necessary, one for
the camera speed-76, 32, or 64 frames
per second-and one for light condi-
tions-B (bright), H (hazy), and D Figrrre 4
(dull) , or f/3.5 (for adverse light con- l'lain lens set for work at 64 frarnes
ditions). l)er second on a hazy day
These adjustments are effected with
the three lens collars P, Q, and R, No additional lens adjustment need
Figure 3. Collar P is fixed, attd bears a be made for the filter, since its factor
.3.View original page 5Page 6 · Read text
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is compensated for in the lens calibra-
tions.
'l'he Lens rvith 90o Lrecting Systerrr.
The lens on Typ. N-5 Camera is
equipped with a 90o erecting system S,
Fisures 3 and 5, which deflects the
photographic aim of the lens by 90o.
For example, with the lens pointed
vertically upward, the photographic
aim is on a horizontal plane.
www.butkus.us 'fhe erector is affixed to the outer
Figrrre 5 flange of the lens sheath by 3 scrervs V,
Figures 5 and 6, which will fit in any Lcns with 90o ereeting systern of 4 threaded holes X, Figure 6, which
S. 90'ereeling systern are tapped at quadrants about the cir-
T. Lcns cumfierence of the lens flange. Thus,V. Scrcrys. which are rernovetl wherr rvhen the screr,r's are removed, as in crecting systern is to be shiftedW. Filtcr Figure 6, the photographic aim may
be changed, at intervals of 90' in the
sarne plane, by aiming the erecting
system in the desired direction and
replacing the screws.
The3filter W, Figure 5, is removable.
Figure 7 Figure 6
Erecting systern rernoved Plain lens, with filter rernore.d I
3 screws W. Filterv.x. 4 equi-distant screw holes, for Y. Wrench, to be used in changing
resclting the erecting system at lenses intcrvals of 90" on the sarrle
plane Z. Dust cap
.4.View original page 6Page 7 · Read text
The Plain Lens. The plain lens on from becoming frost-covered in ex-
Typ. N-4 Camera (see Figures 4 and treme cold, the heater cord should be
7) is the same as that on Type N-5 plugged into the pin-jacks K, Figure 2,
except that there is no erecting system. rvhich are provided for this purpose.
Therefore, the photographic aim is on
the same plane as the axis of the lens.
The plain lens is equipped with a filter FIDUCIAT MARKS
W, Figure 7, which is removable. While no reticle pattern has been in-
Interchangeability. Both types of corporated in the optical system of the
lenses are interchangeable on both camer a, the photographic aperture has
types of cameras. But, erecting system lre en provided u'ith trvo pairs of fiducial
and filter are not interchangeable and marks which will be visible in each
will not fit both lenses described herein. frame of exposed film. One pair of
IMPORTANT: Neaer attempt to dis- these marks is located on the horizon-
assemblc the lens or the erecting system. tal plane on the center line of the frame,
and the other pair is on the exact
vertical center line of the frame.
THE FITTER It will be observed that rhe crosslines
Each lens is equipped with an amber of the aligning indicator align them-
filter having light transmission char- selves with the fiducial marks irr the
acteristics equivalent to a Wratten No. aperture.
12 (minus blue) filter. The filter
should be left in position at all times,
except for cleaning, for two reasons: ALIGNING INDICATOIi
(1) lens adjustments are calibra',:i to
compensate for the increased exposure
required when a filter is used, and
(2) the filter will prevent dust and
dirt from reaching the optical surfaces
in lens and erecting system.
HEATING UNITS Figrrrc lf
Aligning indicalor To prevent lreezing at high altitudes,
the camera is eqrripped rvith a therrno- C. B1'epiece
static heater, which, dowrt to a mini-
mum of 40' F. below zero, automati- The aligning indicator, Figure 8, for cally maintains the intcrior of the the GSAP Camera is designed to fit camera at a temperature between 35oI into the chamber ordinarily occupied F. and 95' F. The heater starts operat- by the film magazine. Insert the indi-
T ing when the temperature drops below cator as shown in Figure 9, the rounded
35' F. and is cut out if the internal end going in first, and the flat, solid side temperature rises to 95' F. of the indicator facing the outside of the
If an external, lens-heating unit is camera (the door-hinge side). Push the
to be used, to prevent the glass surfiaces indicator in as far as it will go.
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Figure 9
Inserting :rligrring irrrlical<lr
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Thc eyepiece C, Irigurc 8, of tlrt'
optical system will rota te tlrroug,*lr
360", and may be used in any yrosition.
The eyepiece may be detachecl li'om tlrc
indicator simply by pulling it out, arrcl
care should be taken that when it is
replaced, the tube is pushed into tlre
indicator up to the hilt, in order to
engage the spring button (within the
indicator) with the groove on the tube.
The cross lines of the aligning indica-
tor are adjusted in manufacture to
correspond with the fiducial marks of
the photographic aperture. If the
cross lines do not coincide with the
camer-a fiducial marks, the camera
should be turned in to an overhaul
aci'r it)' for checking and adjustment.
,, h EAIER THERMO5T\]
Figtrre l0
Wiring diagrarn for cantera
Frorl the 4-prong receptacle on the carnera, a line cable goes to tlre stiek
control srvilch atrd thencc to the source of power
.6.View original page 8Page 9 · Read text
so that movement within the CARRYING CASE each unit,
case is reduced to a minimum. Each
The specially built carrf ing case unit should be packed in the case as
provides compartments designed to fit shown in Figure 1 1.
Figure ll
Carryihg case, with various units properly fitted into their cornpartrnents
B. Filrn rnagazine AA. Receptaeles for extra lenses
W. Filter BB. Aligning indicator
Y. Wrench CC. Instruction book
Z. Dust eap DD. Extra identification cards
EE. Canrera
I:L CAMERA MAINTENANCE Cleaning. Cleanliness is an important
successful operation Lubrication. The camera is com- factor in the
pletely lubricated when it leaves the of any motion picture camera. While
factory, and no further lubrication the lens, erecting system' sunshade,
of any part is necessary. Lubrication and filter are removable, no further
will be checked and renewed when disassembly of lens or erecting system
necessary, when the camera is over- should be attempted. The fi.lter and
hauled. the outer lens surface should be cleaned
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