Always attach the Motor Drive to an empty camera. Test it out and make certain it is working properly before loading film--it does no harm to either the camera or the Motor Drive to operate them without film. Once the two are working together properly, film can be loaded. The design of the Motor Drive allows film to be rewound and removed, and new film loaded while the Motor Drive is attached. If, for any reason, the Motor Drive is removed and re-attached with film in the camera, several frames may be ruined during the process. I suggest you attach the Motor Drive and leave it attached until you have taken all the pictures you need.

Attaching the Motor Drive to the Camera

If the Motor Drive is to be used without the Bulk Film Magazine, the adapter plate must be attached to the top of the Motor Drive. The cover for the Drive socket should be unscrewed from the bottom of the camera body and the exposure arm on the Motor Drive rotated to the vertical position. Store the cover, unscrewed from the body, in a safe place--it is easy to lose this item and it must be re-installed in the body when the Motor Drive is removed to prevent dirt or water from entering. Also, turn on the exposure meter before attaching the Motor Drive since this switch is not accessible with the Motor Drive attached.

The Motor Drive attaches to the camera body at three points:  First, the screw on the Motor Drive that screws into the tripod bushing on the bottom of the body; second, the collar on the top of the Motor Drive fits into the 'Drive' opening on the bottom of the camera body; and third, the exposure arm. When installing the Motor Drive make certain that the cutout in the top of the exposure arm fits into the recess beneath the collar surrounding the shutter release button.

It is sometimes difficult to get the Motor Drive properly attached to the camera body. My procedure is to first align the drive pins on the Motor Drive to be in line with the long axis of the Drive housing. Then slide the Motor Drive and the camera body together, making certain that the exposure arm slips under the exposure button collar. When they are aligned, begin to tighten the mounting screw--using the 'D' ring on the bottom of the Motor Drive. Leave the screw slightly loose and move the Motor Drive around and back and forth while applying a little pressure to bring the Motor Drive and the camera together. At some point the collar on the Motor Drive should align with the opening in the bottom of the camera and the two should come together without any space remaining between them. When this happens, tighten the mounting screw.

Holding the camera body in one hand and the Motor Drive in the other, try moving them with respect to each other. When the Motor Drive is properly attached it is firmly secured to the camera and no relative movement is possible. If movement is detected, loosen the mounting screw and try again.

If the attachment seems proper but the Motor Drive wiggles forword and backward while the Motor Drive is advancing film, then they are not properly attached and the screw must be loosened and the process repeated.

If the alignment is difficult, I have sometimes tightened the screw a little and then manually released the shutter and advanced film with the lever on the camera. (Note: manually exposing and advancing film does no harm to either the camera or the Motor Drive.) You may have to advance several frames, but usually a point is reached where alignment is achieved and the Motor Drive and the camera come together.

For reliable operation ,there must be no space between the Motor Drive and the bottom of the camera. The two should be touching along all edges. Sometimes the screw will loosen while the Motor Drive is being used, especially when operating in the continuous mode. The tightness of the attachment screw should be checked when the drive is being used, and re-tightened if it has become loose.

Once the Motor Drive is mounted, connect the power pack. If a corded-type pack is being used, remove the cap cover from the bottom of the Motor Drive handle (if one is present) and attach the power cord.

Controls

The Expose Button is on the front of the Motor Drive and is surrounded by a chrome ring. This ring can rotate with the black dot on the ring pointing to either U or L. The L stands for Lock and locks the Expose Button to prevent inadvertent exposures. The U stands for Unlocked and allows the Expose Button to be depressed when taking pictures.

Also, on the front, are the two pin contacts for a non-cord battery pack. When an external battery pack is used these pins are HOT electrically. Do not allow metal of any kind to touch both pins at the same time. This will cause a short across the battery and could burn out a wire in either the Motor Drive or the connecting cable.

A small serrated knob can be found on the end of the Motor Drive above the handle. Slide this knob towards the rear to release the film for rewiund back into the cassette using the rewind crank on the camera.

The serrated button on the underside of the Motor Drive is identical to the one on the camera body and releases the catch on the film door to allow it to be opened for removing and loading film.

There is a rotary knob on the rear of the Motor Drive, off center to the left. This knob has three positions marked with 60, 15, and 4. Three lines connect these markings to 1000 near the center of the dial. These markings relate to the setting of the shutter speed dial on the camera and their meaning is:

In the 60 position, the shutter speed dial must be between 1/60^th and 1/1000^th of a second. In the Continuous Mode this setting will expose 3 frames per second.

In the 15 position, the shutter speed dial must be between 1/15^th and 1/1000^th of a second. In the Continuous Mode this setting will expose 2 frames per second.

In the 4 position, the shutter speed dial must be between 1/4^th and 1/1000^th of a second. In the Continuous Mode this setting will expose 1 frame per second.

Note that shutter speeds of 1 and ½ seconds are not allowed.

It is important that this dial be coordinated with the shutter speed of the camera. Its purpose is ensure that film advance is not started before the curtains of the focal plane shutter have completed their run. Maladjustment could result in pictures that are exposed on the left side but blank on the right side. This adjustment must be made regardless of whether in the single or continuous mode.

Just below this knob is a slide switch that can be moved left towards a letter S or to the right and towards the letter C. The S stands for Single frame. In this mode of operation, the camera shutter is released when the Expose Button on the front of the Motor Drive is pressed and film is advanced when it is released--except when the speed knob, described above, is set at the 4 position. For this case, there may be a delay after releasing the Expose Button before the frame is advanced.

The letter C stands for continuous operation and exposures followed by film advances will continue as long as the Expose Button is held down. The cyclic speed depends on the setting of the speed dial:  Three frames per second for the 60 position, two frames per second for the 15 position, and one frame per second for the 4 position. Again, the setting of the speed dial must be coordinated with the shutter speed of the camera. NOTE: At three frames a second, holding down the Expose Button for only 12 seconds will run through all frames of a 36 exposure cassette.

CAUTION  If the Motor Drive starts rewind before the closing curtain of the focal-plane shutter has finished its run, then the mirror will stay in the up position for the next frame. It will return to normal after the next normal exposure. On some older cameras, allowing rewind before the shutter action is complete may cause the camera to 'hang up'-both the shutter release and the film advance are frozen-and will require a visit to a camera repairman.

Towards the right end, at the rear of the Motor Drive, is a curved window showing calibrations between 0 and 250. This is the frames remaining indicator and it down-counts by one as each frame is exposed and advanced. When the zero frame is reached, the Motor Drive shuts off. Below the window is a small knob with an arrow pointing to the counter-clockwise direction. Use this knob to set the number of frames in a film cassette when a new one is loaded. The positions 36 and 20 are marked in red. This dial is difficult to set since it will only rotate only in one direction and because the markings are so fine. If you miss the mark on one try, you must start over.

It is essential that you not forget to set the frames remaining counter each time you load film. If the counter is left at zero, the Motor Drive will not work. If the setting is less than the number of frames in the cassette, the Motor Drive will shut off before the last frames are exposed. If the setting is too large, the Motor Drive will continue to advance past the last frame and may pull the film end out of the cassette--a situation dreaded by any photographer. Unlike the film counter in the camera, the frames remaining counter does not automatically reset itself, this operation is left to the user.

1. Motor Drive and the camera body must be properly attached.
   
2. The Speed Dial on the Motor Drive must be coordinated with thThe e shutter speed of the camera.
   
3. The Frames remaining counter must be set each time a new film cassette is loaded.