The extension tubes are mounted between the lens and the camera, increasing the distance between the lens and the image plane in macro photography. This enlarges the reproduction scale and reduces the depth of field, making it easier to isolate the subject from the background. The extension tubes can be used with various lenses. Three extension tubes provide more flexibility. The set consists of three extension tubes in different sizes, allowing you to reduce the minimum focusing distance of your lens in three different increments, which automatically increases the reproduction scale. They can also be combined with each other. However, this reduces the light intensity, so the use of a tripod is strongly recommended. The extension tubes feature contacts for transmitting EXIF data. Exposure metering is possible in TV and AV modes. Autofocus also works thanks to the contacts.