The Vivitar Automatic Tele Converter 2X‑21 is a compact and lightweight 2× teleconverter designed to double the focal length of compatible lenses, particularly for the Olympus OM mount. It preserves automatic diaphragm and metering functions while halving the effective aperture (e.g. turning f/1.8 into f/3.6), making it ideal for wildlife, sports, or long-distance photography. Composed of 4 elements in 4 groups, it supports accurate exposure and retains minimum focus distance of the original lens. A versatile and affordable accessory to extend reach without sacrificing usability. 

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