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The first SX70 Sonar model model was introduced in 1978. The original retail price was just below $250. There were several versions with minor improvements and there were different colour combinations. As it's a good camera and a real SLR, prices are still quite high. The Sonar might be handy, but adds to the size of the camera.

Features of the SX70 Sonar model:
  
    4-element 116mm f/8 glass lens
    Minimum focus: 10.4 inches
    Autofocus; uses Polaroid Sonar AF system.
    AF "preview" available before exposure is made.
    Full manual focus is also possible.
    Low-light warning in viewfinder.
    Electronic shutter
    Programmed automatic exposure, shutter speeds from >10 sec to 1/175; aperture range f/8- f/22; smaller apertures possible when flash is used.
    Auto flash exposure based on focus distance, Max flash distance 20ft.
    Built-in Flashbar socket for flash. Accessory electronic flashes were also available.
    Socket for an electrically-actuated remote shutter release.
    SLR (Single-Lens Reflex) viewing.
    Chrome-plated or black plastic body with faux leather covering.

Some photos:

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The Polaroid SX70 Sonar. This is the second model, released in 1981.

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Camera front and an electronic Polatronic flash. This flash model needs a tripod. Next to the camera an Ever-Ready leather case.

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Camera unfolded in its Ever-Ready case.

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Camera folded in its Ever-Ready case.

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Closed, seen from above. The Porvair (faux leather) covering begins to deteriorate which is the case quite often.

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Closed, seen from below. Tripod socket.

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Polatronic flash detached. In front of the flash diffusor for close distances.

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A late all-black model and its instructions.

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Flap open.

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Closed, seen from above. The Porvair (faux leather) covering is in extremely good state which isn't the case very often. This is a later Porvair version which seems to age better.

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Closed, seen from below. Tripod socket.

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Camera, flash, both instructions and bag which can contain the set.

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