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Is it unusual though? I have several toy cameras with similar "overlapping circle" shutters, and a medium format Mamiya with a focal-plane leaf shutter where "the iris and the shutter are the same" practically speaking, which differs only from the sx-70 in the shape of the effective iris at the start and end of the exposure.

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There’s a big difference between a leaf shutter, which isn’t unusual, just old fashioned, and actually making the shutter and aperture one and the same mechanism.

What model is your mamiya? Leaf shutters are not normally (by definition, I thought) focal plane shutters. That sounds really interesting!

The Olympus PEN cameras (and subsequent small cameras by olympus) have a in lens shutter that is simply two blades. The blades have a triangle cut out of each side and form a diamond shaped aperture. In this shutter the shutter blades form the aperture. This design is from at least 1959 with the release of the PEN.

Funky!

Except the PEN F where the shutter rotates!

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