The  Mamiya  M645  1000S   is  a  new  improved
model of the M645, a camera widely acclaimed
for  bridging  the  gap  between  small  and  large
format  cameras  by  introducing  the  medium  for-
mat,  the  purpose  of  which  is  to  offer  the  world
of  larger-negative   quality  to  camera  users  who
are accustomed to the handling ease and com-
pactness  of  35mm  SLR’s.
Every  care  has  been  taken  to  assure  that  your
Mamiya  M645  1000s   will  provide  you  with  years
of trouble-free service.  However,
 to avoid possi-
ble mishandling, be sure to carefully read this in-
struction manual before using your new camera.
Special Features of the Mamiya M645  1000s 
Specifications 
Names  and  Functions  of  Parts .......................................... 
................      3
........................................................................               5
  7
Using the Waist-Level  Finder
The  Mamiya  Moving  Coil  Electronic    Shutter.. ..  .............. 
Depth-of-Field 
..................................................................... 
....................................... 
 S 
Testing to See if the Camera Functions Properly  ........  1 6
Using Flash 
........................................................................... 
Interchanging  Lenses  ........................................................ 
Interchanging Finders  ........................................................ 
Focusing  Screens 
.............................................................. 
1 7
1 8
2 0
Inserting a Battery 
..............................................................                    2 1
Battery  Check  .......................................................................                      22
Film  Loading 
....................................................................... 
Film  advancing 
..................................................................... 
Shutter  Speed  Dial  .............................................................. 
2 3
2 7
2 7
Multiple-Exposures 
............................................................ 
Infrared  Photography 
......................................................... 
Mirror  Lock-up .....................................................................
Using  the  Delayed  Shutter  Release 
Interchanging  the  Film  Advance  Crank  .......
................................. 
....................  
Tripod  Socket  ........................................................................ 
Time  Exposures 
.................................................................. 
4 4
4 7
4 8
4 9
5 0
  5 0
51
  5 2
  5 3
  5 5
5 5
Aperture  Ring/Stop-down  Operation  .............................. 
2 8
................................................................................                         2 9
........  3 0
31
3 2
.................................................................... 
.................................................................... 
Shutter Release and Film Transport Mechanism 
Focusing 
Unloading  Film 
T h e  Neck  Strap 
Trouble-Shooting 
Precautions  ........................................................................... 
Care of the Camera
..................................................................                 5 6
5 7
............................................................
Mamiya-Sekor  C  Lenses ...................................................
Holding the   Camera 
Using  the  PD  Prism  Finder  S 
Using  the  CdS  Prism  Finder 
........................................................... 
3 2
Depth-of-Field  Table 
......................................................... 
.............................................              3 5
Accessories 
.......................................................................... 
.............................................            3 9
2
5 8
5 9
6 2
 6 3
em-.-
Special Features of the Mamiya  M645  1000S  \ ’ \
__-~_---  ~.~ -.-I~  .-. -
The Mamiya M645 is a 6 x  4.5cm large-negative SLR that
is  both  extremely  versatile  and  compact.
4 .  Large,  Bright  Viewfinder
i .  Large-Negative  Quality
The  6  x 4.5cm  format  offers  approximately  3  times  more
area than the 35mm format. Moreover, unlike the 6 x 6cm
square negative, there is little waste of the negative area.
For beautiful color enlargements everytime, the 6  x 4.5cm
format is the ideal format.
2 .  Compact  Design
Despite the large-negative it produces, the Mamiya M645
is  designed  to  handle  as  easily  as  a  35mm  SLR.  Its  com-
pact  size  and  light  weight  are  perfectly  suited  for  the  ac-
tion  photographer.  It  fits  so  well  into  one’s  hands  that  it
becomes  an  extension  of  his  reflexes,
3 n   Mamiya’s  Moving  Coil  Electronic  Shutter
Mamiya has developed a revolutionary Moving Coil Elec-
It becomes easy to catch the peak of action when looking
through  the  large,  bright  viewfinder.  Because  of  the
Mamiya  M645’s  automatic  diaphragm  and  quick-return
mirror, the viewfinder never grows dim. It is always bright,
ready for the next photograph.
Interchangeable  Finders
5 . 
a  Lightweight,  dual-function  Waist-Level  Finder  S
A compact and lightweight finder which opens and closes
with  a  single  touch,  the  Waist-Level  Finder  S  is  ideal  for
copying,  close-ups,  low  and  high  angle  pictures,  and
working in dim light. Additionally, it is instantly convertible
to  an  eye-level  sports  finder  which  accurately  shows  the
fields  for  the  80,110,150   and 210mm lenses, allowing one
to easily follow the quickest action.
0 Prism Finder
The  Prism  Finder  is  well-suited  for  action  photography.
tronically  Controlled  Shutter  for  the  Mamiya  M645.  Elec-
Whether the vertical or horizontal format is utilized, focus-
trical  consumption  of  this  new  shutter  is  approximately
1/10   that  of  previous  electronic  shutters.  Furthermore,
consumption  remains  constant  regardless  of  the  shutter
ing and following action is as easy as on a 35mm SLR.
0 PD Prism Finder
The PD Prism Finder employs silicon cells for full-aperture,
speed  being  used.  In  addition  to  accuracy,  long  battery
center-weighted  readings.  It  is  your  assurance  that  every
life  is  assured  by  this  new  shutter.
negative will be properly exposed.
3
a  CdS   Prism  Finder  with  built-in  meter
Accurate 
through-the-lens  exposure  measurement 
is
possible with the  CdS Prism Finder which couples to the
aperture  of  the  lens  and  indicates  the  proper  shutter
speed to set on the camera.
6 . Flatness  of  the  Film  Plane
Developed through Mamiya’s long experience as a manu-
complete with meter coupling.
l Multiple-Exposure  Provision
Merely  lowering  the  multiple-exposure  lever  allows  the
photographer  to  take  as  many  multiple-exposures  as  he
wishes.  During  multiple-exposures,  the  exposure  counter
does not move.
a  Mirror  Lock-Up
The  Mamiya  M645  is  designed  to  have  minimal  mirror
facturer of 120/220 roll-film cameras, the Roll-Film Inserts
shock;  nevertheless,  when  it  is  necessary  to  completely
for the Mamiya M645 keep the film perfectly flat for  edge-
eliminate  vibrations,  all  you  have  to  do  is  lock  the  mirror
to-edge  sharpness.  Inserts  are  available  for  120  or  220
in the up position. To do so, simply lower the mirror lock-
roll-film.
7 .  Multi-Coated  Lenses
Mamiya-Sekor lenses have achieved world-renown as pro-
fessional  lenses  of  exceptional  contrast,  high  resolution,
clear  definition,  and  excellent  color  balance.  All  the  lenses
for the Mamiya M645, from wide-angle to telephoto, have
been multi-coated to maintain their high standard of per-
formance even under adverse lighting,
8 .  Unlimited  Scope
A  full  range  of  accessories  are  available  for  the  Mamiya
M645 to assist the photographer in capturing virtually any
up  lever.  Mirror  lock-up  provision  makes  close-up  and
telephoto  photography  possible  even  at  slow  shutter
speeds.
l Two  Shutter  Release  Buttons
The  Mamiya  M645  is  equipped  with  two  ideally  located
shutter  release  buttons,  so  that  regardless  of  how  you
hold the camera, there is always a release button at your
finger tips.
a  Built-in  Delayed  Shutter  Release
a  Depth-of-Field  Preview  Lever
A  single  touch  on  the   Depth-of-Field  Preview  Lever,
which  is  ideally  located  on  the  camera  body,  stops  the
type  of  image.  Accessories  include  hand  grips,  inter-
lens  down  to  the  preselected  aperture  for  direct  viewing
changeable  focusing  screens,  and  auto  extension  rings
of the depth-of-field.
4
-
Specifications
- --ll_-- ____
0 Camera Body
Camera  Type: 
6  x  4.5 cm  electronic focal-plane shutter SLR.
Film  Type:
120 roll-film for 15 exposures,
220 roll-film for 30 exposures
Actual  Negative  Size:
56  x  41.5mm  (2-13/64”  x1-41/64”)
Standard  Lenses:
Mamiya-Sekor  C  (multi-coated)
80mm  f/1.9,  automatic  diaphragm,
with meter coupler, 67mm filter size
Mamiya-Sekor  C  (multi-coated)
80mm  f/2.8,  automatic  diaphragm,
with meter coupler, 58mm filter size
Lens  Mount:
Mamiya  M645  bayonet  mount
Shutter:
B, 8-1/1000  sec.
Moving Coil Electronic Focal-Plane Shutter,
FP  and  X  (1/60  sec.)  synchronization,
Shutter  release  lock  and  shutter  speed  dial  lock
provision
Battery  Type:
One 6V silver-oxide battery  4SR44
(Eveready  544,  UCAR  544,  Mallory  PX28)
or 6V alkaline battery 4LR44
Focusing  Method:
Each  Mamiya-Sekor  lens  is  equipped  with  its  own
helicoid focusing mount
Focusing  Screen:
The standard focusing screen, which  is interchange-
able, has three focusing aids, a central split-image
rangefinder  spot  (wedge  set  at  a  45°  angle)  sur-
rounded  by  a  micro-prism  collar  and  outer  ground
glass  ring.  A  Fresnel  lens  assures  corner-to-corner
brightness,  and  94%  of  the  picture-taking  area  is
visible.
Mirror:
Instant  return,  with  mirror  lock-up  provision
Film  Transport:
A single revolution of the interchangeable film ad-
vance  crank  transports  the  film.  The  camera  is
equipped with double exposure prevention, but mul-
tiple exposure can be easily made.
Exposure  Counter:
Progressive 
changeover with insertion of 120/220 roll-film inserts
type,  automatic 
reset,  automatic
Battery  Check:
Depressing  B.C.  button  illuminates  green  L.E.D   if
battery  condition  is  satisfactory.
Multiple-Exposure:
Lowering  multiple-exposure  lever  makes  multiple-
exposures  possible;  exposure  counter  does  not
move  during  multiple-exposures.
Delayed  Shutter  Release:
Variable time delay of  5-10  seconds.
Depth-of-Field  Preview  Lever:
Spring-loaded,  self-returning.
Interchangeable  Finders
D 
Prism  Finder:
The image  in the Prism Finder  is  right-side  up, lat-
erally  correct,  and  moves  in  the  correct  direction;
magnification of 0.74X with the standard lens at in-
finity,  built-on  hot-shoe;  comes  with  eyecup.
PD  Prism  Finder:
Prism  Finder  with  built-in  silicon  cell,  through-the-
lens, 
full-aperture,  center-werghted  metering:  7
LED’s  visible  in  the  viewfinder  for  correct  or  com-
pensated  exposure,  with  100  ASA   and  f/1.9  lens,
meter  coupling  range  of  EV  -1.15  -  +19   (f/1.9,
8  sec.-  f/22,  1/1000  sec.);  with  f/2.8  lens,  EV  0-  19
(f/2.8,  8  sec.  -  f/22,  1/1000  sec.);  camera  body  bat-
tery  serves  as  power  source;  other  features  same  as
Prism  Finder.
CdS  Prism Finder:
Prism  Finder  with  CdS  through-the-lens,  full-aper-
ture,  center-weighted  metering;  zero  method  with
indicator  needle;  couples  to  aperture  and  shutter
speed  manually  set,  power  source,  one  1.5V silver
oxide  battery  SR44  or  alkaline  battery  LR44,  with
100  ASA   and  f/1.9  lens,  meter  coupling  range  of
EV  2.85  -  17  (f/1.9,  1/2  sec.  -  f/11,  1/1000  sec.):
with  f/2  8  lens:  EV  4  -  18  (f/2.8,  1/2  sec.  -  f/16,
1/1000  sec.);  other  features  same  as  Prism  Finder.
Waist-Level  Finder  S:
Opens  and  closes  with  a  single  touch;  magnification
of  1.3X   (w/standard  lens  at  infinity);  diopter  correc-
tion  lenses  interchangeable  with  standard  magnifier;
built-  in  sports  finder  shows  field  for  standard  lens
and  accepts  a  mask  for  110,150,  and  210mm  lenses,
all fields showing approximately 80% of the picture-
taking area.
Dimensions  and  Weight:
(width,  height,  depth,  w/80mm  f/1.9  lens)
(w/Waist-Level  Finder  S)            (w/1.9  lens)
3-29/32” 
x  3-15/16” 
x 6-9/16” 
(99.3  x  100  x  166.5mm)
(w/Prism  Finder)
3-29/32” 
x 4-27/32” x 6-9/16”  
(99.3  x  122.7  x  166.5mm)
(w/PD Prism Finder S)
3-29/32”   x 4-29/32” 
x 6-9/16” 
(99.3  x  124.7  x 166.5mm)
55.4  oz
(1570  g)
    62.3  oz
(1765  g)
        66.5  oz
(1885  g)
(w/2.8 lens)
49.6  oz
(1405  g)
56.4  oz
(1600  g)
60.7  oz
(1720   g)
61.4  oz
(1740  g)
(w/CdS   Prism  Finder)
3-29/32” x  4-29/32”  x 6-9/16” 
(99.3  x  124.7  x  166.5mm)
      67.2  oz
(1905   g)
Depth  w/80mm   f/2.8  lens;  6-1/16”  (154mm)
Names  and  Functions  of  Parts  (1)
-
- -___-- 
lug
types  are
Focusing  screen
Five  different 
available.
Focusing  screen 
Mounting  guide  pin  for
finder
Fits  into  the  finder  opening.
Alignment  dot
Alignment  reference  point
for  mounting  lens.
Depth of Field Preview
A slight upward push on the
lever  stops  lens  down  to
preselected  aperture,
spring-loaded  for  self-return.
Shutter  release  button
(front)
When  pushing  in  on  this
button,  the  upper  shutter
release button is coupled to
move  in  unison.
Equipped  with  cable 
lease  socket.
Shutter  release  lock  ring
Turn lock ring and align with red dot to  simul-
taneously  lock  both  shutter  release  buttons.
To  unlock,  align  with  white  dot.
re-
lamp
Battery  check 
If  the  green  battery  check  lamp  glows  when  the
battery  check  button  on  the  opposite  side  is  de-
pressed,  battery  condition  is  good.
Flash  sync  terminals
With  safety  cover,  only  the
cover  of  the  sync  terminal
being used is removed.
Neck  strap  lug
Shutter  speed
alignment  mark
Shutter  speed  dial
Push in on safety  lock built
into  the  center  of  the  shut-
ter  speed  dial  while  rotating
dial  to  desired  speed.
Do  not  set  dial  to  the  @
position  unless  using  the
PD or AE Prism Finder.
---4B   Lens  release  button
Push  in  and  simultaneously
turn the lens  counterclock-
wise  to  remove.
Delayed  Shutter  Release  Lever
To  cock  the  built-in  delayed  shutter  release,  turn  the
lever clockwise. Upon removing your finger from the
lever it will return to its former position, leaving the
Never  touch  the 
surface  of  the  mirror.  activating  lever  exposed.  Push  the  activating  lever  in
the  direction  of  the  engraved  arrow  to  start  the  de-
7                      layed shutter release.