The Plaubel 6x9 - 120 Roll Film
Roll film HOLDER
Open the Plaubel ROLL FILM HOLDER , then pull out the advance knob (the one with no figures). The inside film-holder comes out. Replace the empty spool by the unexposed film and bring the paper-start around the rollers to the empty spool, to attach it. Bring the knob back in position so that its falls back in the notch of the empty film-spool. Close the film-cassette. Now turn the film advance knob. If its sticks, move the red-dotted handle and turn the knob again. Keep watching the black paper while turning. Suddenly you’ll see a piece of tape .This is the start where the film is attached to the paper. Now stop turning and put the dark-slide back. Pull out the knob with the figures and turn it until the red "0" is opposite to the red spot on the level between the two knobs, and push it back in position. Turn the right knob until its stops. The figure "1" is opposite the red spot. Now the film is in the right position to fire. To transport the film in its next position, just move the handle to the left and turn the advance knob, then release the handle and turn the advance- knob until it stops automatically. This system works properly, but all this does not help against blanks if you forget to use the dark-slide, or double exposures, if you should forget to advance the film after firing.
Advance the film without the dark-slide until the tape appears, then close the holder by putting the dark-slide back.
Set knob with figures the "0" opposite the red spot.
Don't forget to put dark slide back into film holder.
With closed dark-slide, advance film by turning the right knob, until "1" is opposite the red dot. Ready to take the first photo.
The Plaubel Rangefinder
and how it works.
A pellicle mirror (diminutive of pellis, a skin or film) is an ultra-thin, ultra-lightweight semi-transparent mirror employed in the light path of an optical instrument, splitting the light beam into two separate beams, both of reduced light intensity. Splitting the beam allows its use for multiple purposes simultaneously. A rangefinder coupled to the focusing mechanism of a camera is such a purpose. In the middle of the last century these rangefinders were very popular with press cameras such as the Plaubel. The rangefinder cover equiped with two windows in front and one eye piece in the back is placed on top of the camera house. Inside the rangefinder you'll find two mirrors. One is a light colored fixed optical* mirror and the other one is the so called beam splitter. The beam splitter is light colored and is fixed in a frame. The pivotable beam splitter frame is connected by a shaft to the strut which connects the front with the middle of the camera back. While focusing the strut will move left or right and the beam splitter frame with the beam-splitter will follow this movement simultaneously.
Now while looking through the eyepiece at the rear of the rangefinder, it will be possible to see two distinct image areas, one round colored spot lying within the other which is rectangular. As the camera is focused the rangefinder mechanism will be operated in such a way as to cause the centrally located image to move horizontally. When the image in this area exactly coincides with the image in the larger area, the rangefinder will be in correct adjustment for that subject. The better the subject is illuminated, the better the contrast.
The Simple Explanation.
The Plaubel rangefinder with removed cover on the left and the schematic drawing on the right.
When the image of the subject is reflected by the mirror and it reaches the beam-splitter the image is still 100 %.
However only 50 percent will be directed to the eye. The other 50 percent travels through the beam-splitter. Let's say this is image A.
The same happens to the image of the subject which travels in a straight line through the beam splitter to the eye. Only 50 percent will reach the eye. Let's say this is image B.
The total image A+B, can be seen in the eye piece as two images. In that case the subject is out of focus. Focusing by turning the focusing knob will alter the angle of the beam splitter.
The right distance to the subject is set, if both images coinside and merge together as one image,
*) Optical mirror is a mirror with the silver coating on top of the glass.
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