The Polaroid SX-70 Sonar Autofocus is an instant camera that was introduced in the late 1970s. With its range of functions, it is similar to the Alpha 1, but it brought a groundbreaking innovation: the SLR autofocus. In addition, it has a low-light warning in the viewfinder.
A fixed lens with a focal length of 116 mm is installed in the camera, and its widest aperture is f/8. Manual focusing is not necessary with this camera, as it is equipped with autofocus. This measures the distance to the subject using sound waves. However, the camera can also be focused manually and the closest focusing distance is 26 cm.
The Polaroid SX-70 Sonar Autofocus has a built-in light meter that can automatically set the aperture and exposure time. It is also possible to use an external flash via the flashbar socket. The power needed for the camera comes from the battery in the film pack. There is a thread for a tripod on the bottom of the camera.
Films for the Polaroid SX-70 Sonar Autofocus
The Sonar Autofocus is designed for the SX-70 format. These films used to be manufactured by Polaroid. Then Polaroid stopped the production. Today, films for the instant camera are again produced and also sold under the “Polaroid” brand.
The new films give better results than expired films from the old production, if you can still find them. There is a black and white film, Polaroid B&W Film for SX-70*, and a film for color images, Polaroid Color Film for SX-70*. One pack contains eight unexposed photos. In the past, there were still ten pictures in a cartridge. Therefore, you already have to change the film when you see the two in the frame counter window.
After the shutter release is pressed, the image is transported out of the camera by a motor. It passes through two rollers that distribute the developing chemicals over the image. After a few minutes, you hold the finished instant picture in your hand.
Technical datasheet
| Attribute | Specification |
|---|---|
| Type of Camera | Instant camera |
| Film format | SX-70 |
| Film transport | Automatic |
| Film transport mechanism | Motor |
| Picture format | 79 mm x 79 mm |
| Focal length | 116 mm |
| Widest aperture | f/8 |
| Minimum focus distance | 26 cm / 0.8528 ft |
| Focus | Autofocus |
| Exposure times | 1/175 second to 10 seconds |
| Light meter | Yes |
| Exposure modes | Program automatic |
| Exposure compensation | ± 1EV |
| Manual exposure settings | No |
| Built-in flash | No |
| Flash Connection | Flashbar connector |
| Tripod mount | Yes |
| Cable release thread | No |
| Self-timer | No |
| Power supply | 1x battery in filmpack |
| Country of production | USA |
| Estimated value / Used price | 145,74 Euro Estimate based on used prices of 8 offers (possibly with different scope of delivery and/or condition). As of May 18, 2026 |
| Average used price in the year 2023 | 214,08 Euro (231.63 US-Dollar) |
| Average used price in the year 2024 | 215,25 Euro (232.72 US-Dollar) |
| Average used price in the year 2025 | 180,33 Euro (194.83 US-Dollar) |
FAQ about the Polaroid SX-70 Sonar Autofocus
What is the focal length of the lens in the Polaroid SX-70 Sonar Autofocus camera?
The Polaroid SX-70 Sonar Autofocus has a fixed 116mm lens. This is a relatively long focal length, ideal for portraits and medium-distance shots.
How does the autofocus system on this instant camera work?
The camera uses sonar technology to measure the distance to the subject, automatically adjusting the focus. This innovative feature was groundbreaking for its time.
Can I use an external flash with the Polaroid SX-70 Sonar Autofocus?
Yes, this instant camera has a flash bar connector which allows you to attach and use an external flash. This is beneficial in low-light situations.
What type of film does the Polaroid SX-70 Sonar Autofocus use and how many exposures are in a pack?
The device is designed for SX-70 film. Each film pack contains eight exposures, fewer than the older ten-exposure packs.
Does this instant camera offer manual focusing capabilities?
While primarily autofocus, the Polaroid SX-70 Sonar Autofocus does allow for manual focusing. The closest focusing distance in manual mode is 26 cm.