The Square Body Polaroid Sun 660 was introduced in 1981.

It was the first in the range to use Polaroid’s patented Sonar Autofocus device. The distance to the subject was calculated by emitting an sonar (ultrasonic) pulse which then was captured again. The time difference between the sent versus received pulse gave the distance measurement. The sonar emmiter/receiver is the big gold disk next to the lens.

To demonstrate the features of this camera, Polaroid produced transparent versions. They were provided to camera stores so a person could see the functioning parts of the Sun 660 camera.

You can see a similar transparent camera and read more about them on the Impossible blog.

If you’d like to own a piece of Polaroid history and join in the auction – click here to bid!