Kiev 60
The Kiev 60 was a big, heavy medium format camera produced in the former Soviet Union. It was loosely-patterned after the German-made Pentacon 6, in that it was intended to look and operate like a big 35 mm single lens reflex camera. Of course, unlike 35 mm film, medium format film does not have sprocket holes in it to guarantee proper film advancement, and so like the Pentacon, it suffered from somewhat irregular frame spacing. I only used this camera once, because to be honest, I've always found that for off-the-cuff handheld photography which is what I'm most interested in, the advantages of medium format are not outweighed by its disadvantages when compared to 35 mm.