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Hi there,Here's a link to a PDF instruction manual of your camera body. http://www.cameramanuals.org/mamiya_pdf/mamiya_c3.pdf
It is possible that the crank handle is missing, as it is a removable piece. Bring your camera to a camera shop and see if they have a box of old parts to replace it with. You can either use a regular round knob, or (if you're lucky) one with a crank on it.
I would check Ebay for someone selling a camera for parts that you can harvest parts out of. Mamiya doesn't make parts for these cameras anymore, another option is to find a master machinist that can custom fabricate a part/parts for you. You can also check with camera repair shops that might be willing to sell you the parts directly so that you can install them yourself.
The problem sounds like the camera did not reset properly after the last exposure. Minolta deigned the camera to keep the aperture fully open except during exposure. During exposure it snaps the aperture down to the selected opening, then opens it again to allow enough light for proper focusing. If it did not fully open the blades after the shot, much less light would pass through the lens. The viewfinder would be darker and look murky. Most likely cause? Dried up lubricants in the camera. Next likely cause? Teeth broken on a plastic gear. Get it to a camera repair place. Get estimates first.
Hello. Your camera is a Rolleiflex TLR model with a removable focusing hood. It was introduced in 1958, It has the famous Tessar lens, designed by Paul Rudolph in 1902 when he worked for Zeiss. It is Bay size I.
If you would like to download the entire data base you may. Here it is:
likely there's nothing wrong with the D300 - all that's happened is that its inadvertently been set into bracketing mode and hence it cycles through 3 or 5 or 7 different exposures each time it is activated!