Huge Reflex Camera with Horizontal 5x7 Stationary Back .
1923 - 1942
The camera is equipped with the famous Graflex Focal Plane shutter (1/10 to 1/100 sec + T ) and has a similar body, including the concave curved front, as the famous (1918-1923) Auto Graflex 5x7. The Series B camera misses the enclosure standard around the lens board such as the Series D, permitting interchangeable lenses. Instead the Series B is equipped with the pop open lens cover. Like its predecessor it misses the revolving back.
The focusing hood opens automatically by pressing forward on the spring catch directly opposite forward end of handle allowing the cover to open. Press the two side arms down to draw the focusing hood taut. Set the mirror by pressing lever H down until it locks. Turn the focusing knob until the lens cover pops open. You may see now an image on the ground glass. Focus the object by turning the focus knob for-or backwards. Set the shutter speed according the aperture you found on the camera tag.
The Graflex series B is equipped with a Kodak Anastigmat f= 4,5 - 8 ½ inch. # 34779. The closest working distance is 26 inch.
To remove the upper panel which includes the winding key and the mirror setting lever:
Open the camera and remove the focusing hood. Carefully remove the springs holding the focusing ground glass. Remove the ground glass. You have to loosen the shaft of the mirror mechanism by unscrewing the four screws above the mirror. On the opposite side of the camera you find the round spring assembly box attached by 3 screws to the camera body. Unscrew the 3 screws one by one while holding the disc shaped box under pressure. After unscrewing the last screw let the round box or assembly slip back in neutral position. remove the assembly from the camera. Now the shaft can be pulled out by the mirror setting lever. Having done that the upper panel can be easily removed by unscrewing the four screws of the panel. To get access to the curtain and rollers assembly you have to remove the Graflex Back. All screws are visible except the two ones holding the top of the back. You'll find them beneath the holder slide lock in horizontal position. Do not disassemble the roller from the curtain unless absolutely necessary.
To remove the lower panel.
First release the tension of the lower roller by repeatedly moving knob P upward until figure 1(one) is visible in the window. Unscrew the panel but leave the upper right screw. Unscrew the bolt and place screwdriver in the slit of the shaft. While holding the screwdriver in this position unscrew the last screw and tilt the panel. You'll now notice the tension on the screwdriver and you may let slip the screwdriver through your fingers until the tension is released. Now you can lift the plate assembly . Clean the mechanism and use a tiny bit of oil to make it work smooth again. Check the good working of the lower roller.
To remount the upper panel roll the curtain until it is in open position. Make sure that the upper edge of the curtain matches with the upper edge of the camera exposure opening. The figure in the window of the upper panel has to be "O" . Find the right docking where the gear of the upper roller shaft meets the tooth wheel with the figures. Replace the four screws. Now replace the shaft into the hole and slide it as far as possible. Make sure that the mirror is down and the position of the lever H is down. Replace the four screws in the shaft on the upper side of the mirror. If that is done you have to release the mirror so that is stays in high position. In this position you need less power to finish the next step, the most difficult part of the operation. You may need any help of somebody with strong hands. The fact is that replacing the round box with the mirror spring is quite a job. You will have to turn the disc shaped box clockwise two or three positions. I used a pair of sharp pointed tweezers to turn the disc shaped box into its position.
Remounting the lower assembly.
Set counter on position (1) one. Replace the panel and place screwdriver through the hole of the panel in the slit of the gear of the shaft. Grab panel between thumb and forefinger and lift it so that you can freely turn the shaft with the screwdriver without that the counter-mechanism is connected to the gear of the shaft. Turn the shaft anti clockwise until the spring tension is fairly high. While holding the tension on the shaft with the screwdriver, replace the panel by letting it down. The mechanism will immediate snap to the gear thus preventing that the spring in the shaft releases. You'll be able to replace one or two screws and check the shutter speed. The shutter speed will be fine if the curtain closes from position Open to Close when pressing the release button and the window shows tension 2. To increase the tension you may repeat the previous procedure until the curtain drops nicely from the O to the close position. Each time you release the shutter, you'll have to reset the mirror.
5x7 Graflex Camera Series B. This is the model of camera used by the National Geographic in the teens and twenties. The patent numbers run from 1902 to 1909. The shutter is the roller blind type up to 1/1000 of a second.
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