Verlängerungsröhre

A Verlängerungsröhre, which translates to extension tube in English, is a mechanical device used to increase the distance between an objective lens and a camera sensor or film plane. This increased distance allows for closer focusing distances and therefore higher magnification for macro photography.

Extension tubes are hollow cylinders that contain no optical elements themselves. They are typically made of metal or plastic and are designed to fit between the camera body and the lens. The longer the extension tube, the further the lens is from the sensor, resulting in a greater magnification. Photographers use extension tubes to achieve magnification ratios greater than what is possible with the lens alone, enabling them to capture intricate details of small subjects like insects, flowers, or textures.

There are two main types of extension tubes: manual and automatic. Manual extension tubes simply provide the physical extension and do not transmit any electronic signals between the camera and the lens. This means that aperture control and autofocus are not possible, and the photographer must manually set the aperture and focus. Automatic extension tubes, on the other hand, are equipped with electronic contacts that allow them to transmit signals. This enables features like aperture control and autofocus, making them more convenient to use.

Extension tubes are a cost-effective alternative to dedicated macro lenses, especially for photographers who may only occasionally shoot macro subjects. They are a versatile tool for exploring the world of close-up photography and revealing details often unseen by the naked eye.