The Polaroid SX-70 Sonar OneStep is an instant camera. It was introduced in the late 70s. It is similar in functionality to the Alpha 1. The biggest innovation is the autofocus of the reflex camera. There is also a warning when there is little light in the viewfinder.
A fixed lens is built into the camera. The focal length cannot be changed and is 116 mm. The maximum aperture is f/8, manual focusing is not necessary with the 35 mm camera. The modal comes with an autofocus system. The distance to the subject is measured by sound waves. But it can also be focused manually. The closest focusing distance is 26.4 cm.
The Polaroid SX-70 Sonar OneStep has a built-in light meter. The Polaroid SX-70 Sonar OneStep can automatically set the aperture and exposure time. An external flash can be used via the flash bar socket.
The required power for the camera comes from battery in the film pack. On the bottom of the camera is a thread for a tripod.
Films for the Polaroid SX-70 Sonar OneStep
The Sonar OneStep is designed for the SX-70 format. These films were formerly produced by Polaroid. Today they are available again under the brand name “Polaroid Originals”. These films are fresh and give better results than the old expired films, if you can still find films from the old production.
For the SX-70 format, there is a black and white film, Polaroid B&W Film for SX-70*, and a film for colour images, Polaroid Color Film for SX-70*. There are eight unexposed photos in one package.
After pressing the shutter button, the image is transported out of the camera by a motor. There it passes through two rollers that distribute the developing chemicals over the image. After a few minutes you have the finished instant image in your hand.
Other models
This model was also sold under the name “Polaroid SX-70 SE Land Camera Sonar OneStep”.
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 |
| Estimated value / Used price | 248,88 Euro Estimate based on used prices of 3 offers (possibly with different scope of delivery and/or condition). As of June 8, 2026 |
FAQ about the Polaroid SX-70 Sonar OneStep
How does this Polaroid camera focus?
It uses sonar autofocus, measuring the distance to your subject using sound waves. This is a unique feature for its time. You can also manually focus if needed.
What kind of film does the Polaroid SX-70 Sonar OneStep use?
It uses SX-70 film, available in both color and black and white. These are instant film packs, each containing eight exposures. New film is readily available from Polaroid Originals.
Is there an automatic setting for the exposure on this instant camera?
Yes, it has a built-in light meter and automatically adjusts the aperture and shutter speed. It also warns you if there isn't enough light.
Can I use a flash with this camera?
Yes, there's a flash connection (flash bar) that allows you to use an external flash. This is helpful in low-light situations.
What's the lens like on the Polaroid SX-70 Sonar OneStep?
It has a fixed 116mm lens with a maximum aperture of f/8. You don't need to adjust the focus manually because of the autofocus system.