Here is my conversion of the Polaroid model 900 instant film range finder camera. I will not give you step by step instructions, because I'm pretty sure you have seen many articles describing the process of altering the camera body and fitting the 4x5 back. After all, this conversion has a rather uncommon 4x5 back and I'm not sure that you will be able to find exactly the same one.
This back allowed me to build a very compact 4x5 rangefinder, less bulky, than the previous Graflok back conversions I have built, and even smaller than all of the other conversions I have seen. There is no focusing screen on my conversion, just because it is used mostly as a quick shooter with Grafmatick film changers or instant film holders. The screen can also be used, though, for very precise landscape photography.
The 900 model has the same range finder as the Polaroid 110B, but it cost far less and allows mounting for the vertical portrait shots on a tripod without using the adapters, because the focusing knob is moved out of the center of the front bed.
I have replaced the original lens/shutter assembly with the sharp Schneider Kreuznach 135 4.7 Xenar lens and I'm very happy with it's performance.
Also, I have replaced the original flash socket with a modern hot shoe, that allows me to use a modern flash light and the radio triggers for my studio strobes.
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