Mamiya M645 Film Camera User Manual

Mamiya M645 Film Camera

Special Features

The Mamiya M645 is a 6×45 cm large-format SLR that is both extremely versatile and compact.

Large-Negative Quality
The 6 x 4.5 cm 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 every time, the 6 x 4.5cm format is the ideal format.
Compact Design
Despite the large negative it produces, the Mamiya M645 is designed to handle as easily as a 35mm SLR. It’s compact size and light weight are perfectly suited for the action photographer. It fits so well into one’s hands that it becomes an extension of his reflexes.
Mamiya’s Moving Coil Electronic Shutter
Mamiya has developed a revolutionary Moving Coil Electronically Controlled Shutter for the Mamiya M645. Electrical consumption of this new shutter is approximately 1/10 that of previous electronic shutters. Furthermore, consumption remains constant regardless of the shutter speed being used. In addition to accuracy, long battery life is assured by this new shutter.
Large, Bright Viewfinder
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
- 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.
- Prism Finder
  The Prism Finder is well-suited for action photography. Whether the vertical or horizontal format is utilized, focusing and following action is as easy as on a 35mm SLR
- AE (Automatic Exposure) Prism Finder
  The AE Prism Finder combines an electronic shutter control mechanism and a TTL-type CdS exposure meter to provide aperture-priority, fully automatic exposure.
- PD Prism Finder
  The PD Prism Finder employs silicon cells for full-aperture, center-weighted readings. It is your assurance that every negative will be properly exposed.
- 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.
Flatness of the Film Plane
Developed through Mamiya’s long experience as a manufacturer of 120/220 roll-film cameras, the Roll-Film Inserts for the Mamiya M645 keep the film perfectly flat for edge-to-edge sharpness. Inserts are available for 120 or 220 roll film.
Multi-Coated Lenses
Mamiya-Sekor lenses have achieved world-renowned status as professional 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 performance even under adverse lighting.
Unlimited Scope
A full range of accessories is available for the Mamiya M645 to assist the photographer in capturing virtually any type of image. Accessories include hand grips, interchangeable focusing screens, and auto extension rings complete with meter coupling.
- 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.
- Mirror Lock-Up
  The Mamiya M645 is designed to have minimal mirror shock; nevertheless, when it is necessary to eliminate vibrations, all you have to do is lock the mirror in the up position. To do so, simply lower the mirror lockup lever. Mirror lock-up provision makes close-up and telephoto photography possible even at slow shutter speeds.
- 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 fingertips.

Specifications

Camera Body

Camera Type:
- 6 x 4.5cm electronic focal-plane shutter SLR.
Film Type:
- 120 roll-film for 15 exposures,
- 220 roll-film for 30 exposures
Roll Film Insert:
- Interchangeable, two types available for 120 and 220 size roll films. Actual negative size 56 x 41.5mm.
Standard Lenses:
- Mamiya-Sekor C (multi-coated) 80mm 1/1.9, automatic diaphragm, with meter coupler, 67mm filter size; Mamiya-Sekor C (multi-coated) 80mm 1/2.8, automatic diaphragm, with meter coupler, 58mm filter size
Lens Mount:
- Mamiya M645 bayonet mount
Shutter:
- B, 8—1/500 sec.
- Moving Coil Electronic Focal-Plane Shutter,
- FP and X (1/60 sec.) synchronization,
- Shutter release lock provision
Battery Type:
- One BV silver-oxide battery 4SR44
- or 6V alkaline battery 4LR44
Focusing Method:
- Each Mamiya-Sekor lens is equipped with its own helicoid focusing mount
Focusing Screen:
Microprism center spot (standard focusing screen), the surrounding area is matte, with a Fresnel lens, the focusing screen is interchangeable, 94% of the picture area visible
Mirror:
Instant return, with mirror lock-up provision
Film Transport:
Film transport by a single turn of the crank-equipped film advance knob. Provision to prevent double exposure.
Exposure Counter:
Progressive type, automatic reset, automatic changeover with insertion of 120/220 roll-film inserts
Battery Check:
Depressing the B.C. button illuminates green LE.D. If the battery condition is satisfactory.
Multiple-Exposure:
Lowering the multiple-exposure lever makes multiple exposures possible; the exposure counter does not move during multiple exposures.

Interchangeable Finders

Prism Finder:
The image in the Prism Finder is right-side up, laterally correct, and moves in the correct direction; magnification of 0.74X with the standard lens at infinity; built-on hot-shoe; comes with eyecup.
AE Prism Finder:
Aperture-priority, automatic exposure prism finder with built-in electronic shutter control mechanism and CdS exposure meter. Through-the-lens, center-weighted, full aperture metering with shutter speed in the viewfinder. Meter coupling range is EV2.85 — EV17 (1/19, 1/2 sec. — 1/16,1/500 sec.) with f/1.9 lens and ASA100 film. With the 1/2.8 lens, the meter coupling range is EV4-EV18 (1/2.8, 1/2 sec. — 1/22, 1/500 sec.) using ASA100 film. The camera battery serves as a power source. Other features same as for Prism Finder.

PD Prism Finder S:

Prism Finder with built-in silicon cell, through-the-lens, full-aperture, center-weighted metering; 7 LEDs visible in the viewfinder for correct or compensated exposure; with 100 ASA and {/1.9 lens, meter coupling range of EV -115 — +18 (1/19, 8 sec.— 1/22,1/500 sec.); with {/2.8 lens, EV 0— 18 (1/2.8, 8 sec. — 1/22, 1/500 sec.); camera body battery serves as a power source; other features same as Prism Finder.

CdS Prism Finder:

Prism Finder with CdS through-the-lens full-aperture, 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 1/19 lens, meter coupling range of EV 285 — 17 (11.9, 1/2 sec. — 1/16. 1/500 sec. ); with 1/2.8 lens, EV 4 — 18 (1/2.8, 1/2 sec. — 1/22, 1/500 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 correction 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:

Mamiya M645 Film Camera (1)

Mamiya M645 Film Camera (2)

Mamiya M645 Film Camera (3)

Prism Finder

Mamiya M645 Film Camera (4)

Mamiya M645 Film Camera (5)

Testing to See if the Camera Functions Properly

To release the shutter when there is no film in the camera, proceed as follows. (For detailed instructions on particular points, refer to the page number shown in parentheses.)

Insert a battery into the camera (p.22)
Set the multiple-exposure lever to “MULTI” (p.57) (If you have just purchased the camera and the vinyl tube is still on the take-up spool, there is no need to move the multiple-exposure lever.)
Set the shutter speed dial to any shutter speed other than the ® red mark (p-28)
Turn the film advance knob until it stops.
Align the shutter release lock ring with the white dot and release the shutter (p31)

When ready to load the camera with film, return the multiple-exposure lever to its normal position. If this is not done, the film will not advance.If the shutter is released without a battery in the camera, the mirror will lock in the up position. To return the mirror to its normal position, depress the battery check button (18) as far as it will go. If the shutter is released with the shutter speed dial set to the red ® position, the mirror will lock in the up position. To lower the mirror, turn the shutter speed dial in either direction (B or 1/500 sec.). At times it may be necessary to rotate the film advance knob two full turns to cock the shutter when an empty take-up spool (without its original vinyl tube) is in the camera.

Interchanging Lenses

Removing the Body Cap

While depressing the lens release button (12), turn body cap counterclockwise until the red dots are aligned and lift out.

Attaching Lenses

While aligning the two alignment dots (31 & 4), insert the lens into the camera body. Then twist the lens clockwise until it clicks and locks into place.

Removing Lenses

While depressing the lens release button (12), grasp the part of the lens barrel that has the depth-of-field scale (30) and alignment dot (31), and twist the lens counterclockwise until it stops. Then lift out.

After removing a lens, be sure to place caps on both the lens and camera body.
Never touch the surface of the mirror.
After removing a lens, it is recommended to lock the shutter release button by setting the shutter release lock ring (6) to avoid accidentally releasing a cocked shutter when placing the camera body face down on a table.

Upper Body Cover

Remove the upper body cover from the camera by sliding it to the rear and lifting up.

Focusing Screens

Interchanging Focusing Screens
Five different focusing screens are available to suit various photographic conditions.

Interchanging Finders

Removing the focusing screen
Lift up the focusing screen using the two focusing screen lugs (2).
Attaching the Focusing Screen
Insert the two tabs of the focusing screen into the slots at the back of the opening in the camera top and press lightly so that the screen clicks into place. *The rear surface of the focusing screen
is made of plastic so use care to prevent scratches when removing and attaching.

All of the finders are attached and removed in the same way, except for the AE Prism Finder which is removed by a different method. Prior to attaching the finder to the camera, confirm that the white dot on the finder release button is pointing upward. f the white dot on the button is aligned with the white dot on the finder, by depressing the button and removing your finger from it, the white dot on the button will automatically point upward. In this condition, the button cannot be depressed; consequently, the finder will not be accidentally detached from the camera.

Attaching Finders

Place the rear part of the finder on the camera body while holding the front part of the finder slightly upward. Slide the rear part forward until it stops and gently lower the front part of the finder on to the camera body. It will then lock into place.

Removing Finders

Turn the finder release button clockwise until it stops (about 60°). Then you will be able to push in on the release button.
While pushing in on the release button with your thumb, lift the finder off the camera body.

Precaution:

Do not leave both white dots aligned by turning the button while the finder is attached to the camera. The finder may become detached when the button is occasionally depressed, possibly causing damage. If you depress the button to point the white dot upward while the finder is attached to the camera, be sure to depress the finder against the camera body; otherwise the finder will not be locked into place.

Inserting a Battery

The Mamiya M645 uses one 6V silver-oxide battery 4SR44 (Eveready No. 544, UCAR 544, Mallory PX28 or equivalent) or alkaline battery 4LR44.

Pull the battery chamber cover latch (24) slightly toward the lens and the chamber cover will open.
Next, insert the battery, exercising caution that the + poles match those shown on the diagram of the chamber. Battery removal will be simplified if the battery removal ribbon (A) passes under and over the battery.

CAUTION:

Carefully wipe the contacts of the battery before insertingitinto the chamber. Failure to do so could result in poor electrical contact and consequent erratic functioning of the camera.
When the camera is not used for a long period of time, remove the battery and store it in a cool, dry place.
When replacing a battery, properly dispose of the used battery immediately as it is potentially dangerous. The batteries are explosive and should therefore never be thrown into a fire.
A battery that is not used for a long period, even if it is properly stored in a dry, cool place, may lose some of its charge. Consequently, check its condition after replacing it in the camera with the battery check button.

Battery Check

This camera is designed for use with either silver oxide or alkaline batteries. Although both types offer adequate performance, silver oxide batteries last much longer.

IMPORTANT: When using the PD Prism Finder, make it a point to use silver oxide batteries when available (in this instance, battery life is shortened if alkaline batteries are used).

When the battery check button (18, located above the film advance knob) is depressed, the battery check lamp (7. located above the shutter speed dial) illuminates. If the battery check lamp fails to go on, it is time to replace the battery.

When the battery is completely exhausted, the opened shutter will not close. At this time, if the battery check button is pushed down as far as it will go, the shutter will then close.

Loading the Film Insert

Opening the Back Cover
While gently pushing in on the memo clip (16), move the back cover latch (14) in the direction of the arrow and the camera back cover will open
Removing the Film Insert
While squeezing in on both sides of the release latch (35). Pull the roll-film insert out of the camera body.
Insertion of the Film Insert
- Grasp both sides of the release latch (35) of the film insert, making sure that the film type index (40) is not upside
  down, and place the film insert straight into the camera body. After the film insert has completely entered the camera body, let go of the release latch.
- Press in on the outer edges of the release latch (indicated by the arrows in the photograph above) and the roll-film insert will lock into place. (If the roll-film insert does not go all ihe way in on the right-hand side, turn the film advance knob slightly while pushing in on the right side of the film insert.)
Using Roll-Film Designed for Six Exposures
If you wish to use roll film designed for six 6 «6cm exposures, follow the procedure outlined below.
1. Load the film in a 120 film insert and use it in the normal way. The film will take 7 exposures.
2. After 7 exposures have been taken, set the shutter speed dial to 1/500 sec., wind the film advance knob and release the shutter 4 more times (the exposure counter will indicate “11″).
3. Wind the film advance knob once again so that the exposure counter indicates “12”, open the back cover, and remove the film insert. (Do not release the shutter when the exposure counter indicates “12″)
4. Completely wind the remaining leader paper around the film take-up spool.
  * If the film in the camera is completely wound onto the Take-up spool, there is the danger of the tip of the leader paper getting caught in the shutter curtain and damaging the camera.

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Mamiya M645 Film Camera User Manual