Olympus Zuiko Auto-Zoom 35-70mm f/4 Auto Focus

The Olympus Zuiko Auto Zoom 35-70mm f/4 Auto Focus is a lens from the supplier Olympus. The production facility was located in Japan. It is one of the few lenses for the OM system with an auto focus.

The Olympus Zuiko is a zoom lens. 35 mm to 70 mm is the focal length range. These numbers result in a zoom factor of 2. Over the entire focal length range, it has a maximum aperture of f/4.

For sharp images, you need to keep 75 cm distance. The focus on this model does not need to be set manually. However, it is not a normal autofocus lens as we know it today either. In today’s SLR cameras, the autofocus is controlled by the camera. In this model, there is a box with the autofocus under the normal lens. The incident light is directed by a beam splitter to an autofocus sensor, which passes the data to the built-in motor.

The autofocus is controlled by a button on the lens. However, if the lens is on the Olympus OM-30, the function can also be controlled by the shutter release button. The autofocus can also be switched off. There is also a power focus function. If you use the Power Focus, PF for short, the focusing is done manually via a thumbwheel. A concept that can be found on some Olympus lenses, but was not a great success.

The zoom lens is built up of 7 elements in 7 groups. Is it possible to attach a filter to the lens? Yes, on the 55 mm thread. According to the manufacturer, it weighs 550 grams. This value does not count the additional batteries. Three AAA batteries are needed for autofocus (eBay / Amazon*).