Micro Precision Products User manual

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OPENING AND CLOSING THE CAMERA

TO OPEN THE CAMEM.
Press base catch (1) toward the bottom of the Camera. The base
which is under spring tension will slightly open. Pull the base down
until the base arms (2) Iock into position. Turn the front standard
locking arm (3) until it is pointing along the baseboard and by means of
the locking arm pull the front standard (4) on to the front slide (5)
until the front standard is stopped by the infiniry srops (6). ENSIJRE
THAT BOTH SIDES OF THE FRONT STANDARD ARE FIRMLY ENGAGED.WITH THE
INFINITY STOPS. Lock the front standard in this position by turning
the locking arm (3) to the right or left. The Camera is now ready for
focussing by either of the focussing knobs (7).
TO CLOSE THE CAMEM.
Rack the slide (5) as far back into the Camera as possible by means
of the focussing knobs (7). Unlock the front standard (4) by rurning
locking arm (3) to the front. Push the front standard back into th;
Camera body as far as possible and lock into position by turning front
standard locking arm. f)epress both of the base arms (2) and close the
CameTa. IT IS ESSENTIAL THAT THE SLIDE IS RACKED FULLY BAC( AND
THAT THE FRONT STANDARD IS WELL BACK INTO THE BODY OF THE CAMERA
BEFORE ATTEMPTING TO CLOSE THE CAMERA.
'j e d' INFINITY STOPS. ., ri .'"'
Before leaving the factory each Camera is calibrated for a parti-
cular lens. Focussing scale, Rangefinder and Ground Glass Screen are co-
ordinated. To effect this calibration the infinity stops are set and used
as datum points. Each lens used has its appropriate infinity stops which
are hinged to allow the front standard free iravel along ihe length of
and, the slide. Always remember that the infinity stops are daium pointl-of once set, should never be moved. The selection of a pair infinity* stops for the lens in use is made easy by colour coding. The infinity
9!gps to be used are those bearing the colour marked ot, th. lens panei (8).

FOCUSSING.
Focussing may be accomplished in three differenr ways: -
(i) By Focussing Scale.
(ii) By Coupled Rangefinder.
(iii ) By Ground Glass Screen.

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Method (i). By Focussing Scale.
Select the infinity stops appropriate to the lens by the colour
code. Lift the hinged stop and draw out front standard firmly against the
stops and lock into position. Measure the distance from the subject to
ground glass screen. (The shorter the distance the more accurate must be
the measurement, particularly if using a large aperture. ) Rack the slide
forward by focussing knob (7) until the pointer (9) is opposite the
distance on the scale (10) corresponding to the distance measured. The
Camera is now in focus. Where more than one scale is fitted to the Camera
the scales are colour coded exactly as lens panel and infinity stops.
The scale has been calibrated to the lens supplied and is only true for
that lens. If the scale is used with any ot,her lens, even of the same
manufacture and same nominal focal length, out of focus pictures may
resul t.
Method (ii). By Rangefinder.
First ensure that the cam which operates the Rangefinder bears the
same serial number as the lens. The cams are calculated for individual
lenses and must not be used with other lenses even if they are of the
same nominal focal length and made by the same manufacturer.
View the subject through the eye-piece (11) of the Rangefinder and
rack the slide forward by focussing knob (7). Focus the small brilliant
rectangle on to the subject. The subject is in focus when the two irnages
which are present in this rectangle are superimposed.
lt4ethod (iii). By Ground Glass Screen.
To focus by means of the Ground Glass Screen it is first necessary
to ensure that both the focal plane shutter and the front shutter on the
lens panel are open. To set the focal plane shutter on'open'or'time'
position, place the speed regulator (12) in'F'position and place the
t shutter selector (13) on the BACK position. The body release (14) nmst now be triggered until the figure '0' appears in the speed indicator
window (15). Should the focal plane blind be at the end of its limit of
travel a half turn of the winding key (1e1 will bring the figure '0' in
the window.
The method of opening the front shutter depends on the type of
shutter used. The method varies between Time Exposure, 'set bulb'or
blade arrestor, and the manufacturers' instruction should be followed.
When both focal plane shutter and front shutter are open, the spring

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loaded hood to the lround glass focussing screen is opened by depressing the hood catch (17). The subject can then be viewed on the ground glass
screen. Rack the slide forward or backward until the subject is most
sharply defined on the ground glass screen. The Camera is then in focus.
If it is desired to use a magnifying glass for more accurate focussing,
the focussing hood may be removed by releasing the catch (fB).
This method of focussing, although slo wer thanan eitherei of the
former, has the advantage of allowing the opera tor to viewview the whole of
t,he picture area and to judge t,he composition of the picture.pictr It also
enables him to see the depth of focus available.
l/< VIEWFINDER. et{'.t
o""u lx?ff6;i 'i"o"oJtf3i,f.:ot'f":;.'?it rtixl";1"r0",,?t"T i,"J""':i:"itrl operation. The forward frame is pulled out of the front standard by the
grips (2f) which are situated either side of the frame. The forward
lrame of the viewfinder has a parallax correcting scale engraved on the
right-hand side which enables the height of the forward frame to be set
for the selected distance.
The open frame-finder should not be relied upon to the-exact -giJe coverage of a subject, as the area seen through the viewfinder will vary
considerably from person to person and is greatly affected if the opera-
tor is wearing spectacles.

TRIPOD BUSH.
t""llT; i,,i.h :"1'.i:rli:J'.::-.t;""1"'.i1i .1"' &Xl;oi"'"i.l:oTi.f ':;3r tripod bushes. The bush in the base of the body is for securing the
camera to a tripod when taking horizontal pictures, whilst the bush in
the side of the body is for use when taking vertical pictures. The
a tripod bushes are the standard 3/8" Whitworth thread and adaptors can be
supplied to suit the Z" Whitworth thread.

BODY RELEASE.
The body release (14) is used to trip either the focal plane
shutter or the front shutter. To trip the focal plane shutter the
shutter selector (13) is placed in the BACK position by pushing toward
the top of the Camera. The body release wiII now operate the focal plane
shuttsr. To operate the front shutter the shutter selector is pushed

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down to the FR0{T position. The movement of the body release to the
front shutter is transmitted by cable and adjustment of the operation of
this cable is achieved by the knurled lock nuts (22).

FOCAL PLANE SHUTTER.
The focal plane shutter is built into the rear of the camera body.
It is a continuous blind with fixed width slits which ensure constant
speeds. It is not self-capping so that the sheath of the dark slide must
bL in position when the focal plane shutter is being wound. The various
speeds are: -
Time.. 1/30 Sec. 1/50 Sec. l/I25 Sec.
l/250 Sec. 1/500 Sec. 1/1000 Sec.
The shutter is synchronised for " focal plane bulbs" on: -
Time..-+/t25T€? 1/250 Sec. 1/500 Sec. 1/1000 Sec.
The shutter speeds are set by winding key (15). llhen the shutter is
fully wound and the speed regulator (12) is in position'F' the figure
of 1000 will appear in the speed indicator window (15). The shutter is
now set for 1/1000 of a second. When the shutter has been triggered the
figure '250' will appear in the window. The shutter is now set for l/250
When the shuii"" is triggered the figure'50'wiII appear in the
window"E". indicating that the shutter is set for 1/50 sec. If the shutter
is again triggered the letter'T' appears in the window to show that the
shutler is sei for Time Exposure. When triggered the letter'0' appears'
indicating that the blind is open and it is again necessary to trigger
the body release to close the shutter.
For speeds 1/30, l/125, 1/500 the same procedure is adopted but
with the speed regulator (12) placed in position 'S'.
In selecting the speeds it is, of course, only necessary to wind
the blind up to the speed desired.rD
The speed regulator can be changed from'F' to'S' at any setting
of the shutter.
The electrical connection to the synchronisation contact of the
focal plane shutter is by the two-pin plug (23). A suitable moulded
socket and length of cable to connect the flash-gun is supplied with

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every Camera. It  is important to note that only long duration flash bulbs
designed for use with focal plane shutters should be used.


RANGEFINNER.
     The Rangefinder in the Micro-Press Camera is housed in the upper
compartment of the body.  It  consists  of a stationary  half-silvered
mirror and a moving mirror.  These components are as widely spaced as
possible so as to give the long base which ensures the accuracy of the
rangefinder. Movement of the Rangefinder is actuated by a cam which is
Iocated on the back rack. The cam is  fitted  with dowel holes and is
secured with only one screw so that  it  is readily detachable. The cams
are engraved with the serial  number of the lens with which they are
associated. By these easily interchangeable cams the rangefinder may be
coupled to an infinite number of lenses. To couple and use the rangefinder
the following procedure is adopted:
     Select the lens which it  is desired to use and mount in the front
standard. Pull the front standard out on to the slide up to the appro-
priate  infinity  stops and lock into  position.  Place the cam which is
engraved with the same serial  number as the Iens on the dowels of the
cam bracket and secure with the screw.
       '    View the subject through the eye-piece (11). Rack the slide  back-
ward or forward as necessary until  the two images of the subject which
are present in the brilliant    rectangle  of the eye-piece are super-
imposed. The camera is now in focus. The rangefinder should not be used
if  the subject is less than two yards from the Camera.

CHANGING LENSES.
     Lenses are mounted on substantial  Aluminium panels which have a
groove machined in  their  back surface. This groove engages with  the
register of the front standard and makes a perfect light  trap.
    To change a lens the two retaining  slides (24) are pushed outward
to the extremity of the slots and the lens is readily removed. The next
Iens is placed in position  in  the front  standard and the retaining
slides aie pushed inwards, again to the extremity of the slots.   If  the
lenses which are being changed are mounted in differing types of shutters
it  may be necessary to adjust the operating arm (25).  If  the arm is set
too far down, the shutter will  not operate on Time or Bulb.

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WIDE ANGLE LENSES
Wide Angle Lenses are mounted on the same panels- as ordin.ary lenses
and the p"o"Id.r.. for placing them in the Camera is the same. Wide Angle
Lenses *ith . focal length of only 3" may be used with the Micro-Press
Camera. When using Wide Angle Lenses of 3" focal length- the front
standard is pushed back into the body against the stop and locked into
position ry ine front standard locking arm (3)' To avoid'cut off' by the
t.seboard when using Wide Angle Lens the baseboard can be lowere-d by
depressing the base arms (2)- and allowing the arms to lock in their
s.corrd positio.r. The back rack on which the front standard is locked is
connected to the front slide by links and the wide angle lens can be
focussed by using the focussing knobs (7).
The drop baseboard is also useful when it is desired to lower the
centre of th! lens in respect to the plate. It is used in conjunction
with the swing front. Th; method of operation is to pull the front
standard out on to the slide, then drop the baseboard in its'wide
angle' position. The securing nuts to the swing front -(26) are loosened the swing front adjustel to bring the lens panel parallel to the"rri i... itr. limit Lt it" travel. The securing nuts^ (26) are thenplate,
iighti""d and focussing carried out. In order to make full use of the
'm|vement', it is, of course, necessary to employ a lens with adequate
focal length. It should also be noted that all focussing should be done
by gro..r,J glass screen. The rangefinder and- scales are only operative
whei the is used in the normal position. After using any of the "ir... care should be taken to restore the movement to normal be-'movements'
fore closing the camera.

RISING FRONT.
The Camera is provided with a rising front. Its movement is con-
trolled by the locknuts QT). When these are loosened the front may be
pulled up and locked by the locknuts (27). The rising front is extremely
useful w^hen it is desired to photograph tall buildings etc. It is often
found with normal cameras that, to get the whole of a tall building on
the plate, the camera must be tilted. This causes the vertical lines of
the Luilding to converge. If the rising front of the Micro-Press camera
is used the back of thi camera, or plaie, can be kept parallel with the
face of the building and the rising front adjusted until the whole of
the buiidittg can be seen on the ground glass screen. Photographed in
this way the verticals of the building will not converge.

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CROSS FRONT.
The Camera is also eguipped with a cross front. To use the eross front adjustment, release thl front standard locking arm (3), depress the lateral shift catch (28) and move the front standard sideways.- Lock
in the desired position by locking arm (3). Use of this adjustmenr will correct excessive convergance of horizontal lines.
SLIDE LOCK.
After focussing, the slide can be locked in any position by the slide locking arm (29)
SPRING LOADED FOCUSSING SCREEN
. lhis permits double dark slides to be inserred with rhe minimum oftrouble. When inserting the slide, tlru spring loaded focussing.screen iseased from rhe body of rhe camera by p"""""ing the bottom i? the darkslide against the two ears provided'on ca"sting. th. will rhu f"u""urecause the focussin-g screen,-which against, is held the the oncamera !ac\ bv leaf springs, ro move away r""il lhu-";;;"; ""li"a",bTd, and alrowthe dark slide to be-inserted. The dark is pushed homl until theregister on the dark slide engages in the"liJ.register of the camera.
To release.the.dark slide, press the dark-i" slide toward the ears ofthe casting unril the. re^gister on the slidl ai".rrg"guJ, ahur,the dark slide from rhe camera. The fo.;;l;;1"r..r, will rerurn ".ro""ro irsregister and the Camera is again ready for fo?ussing.

DARK SLIDES OF THE SAME REGISTER MUST BE USED.

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DUE TO THE SHORT FOCAT IENGTH OT WIDE.ANGTE I.ENS,
         THE LENS IS MOUNTED TORWARD OF THE IENS PANET TO
          ENSURE TIIE MINIMUM EXTENSION OT THE BACK SIIDE.




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                   N.B.
     WIDE ANGTE LENS PANET
    MUST BE REMOVED FROM
    ITS SEATING BETONE
     CTOSING CAMERA.




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                                 CAMERA WITH THE BASEBOARD
                                         IN ITS DROPPED POSITION-TOR
                                      USE WTTH WIDE.ANGIE [ENS.



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