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Russ Morris has a step-by-step on taking photos through another camera’s viewfinder… he writes – “I created my first contraption from black construction paper using rough measurements taken directly from the Duaflex. I made holes for the lenses and film advance knob to poke through, wrapped the paper channel around the camera body and secured it with a lot of gaffers tape…” [via] – Link.

More:
Through the Viewfinder group (Flickr) – Link.