Details from Amazon:
- The SEL20TC teleconverter is compatible with the following lenses: SEL70200GM, SEL100400GM
- Lenses / groups: 8/5 Distance encoder
- Dimensions: 62.4 x 42.7 mm; Weight: 207 g
- Sony SEL-20TC Front cap Bayonet cap Case
A 2x teleconverter with top optics and operation that maintains full G Master performance. Full optical quality and operability are retained, offering outstanding performance for sports of wildlife photography in a compact, lightweight kit. Multiplies focal length by 2x with only a 2-stop light loss. The SEL20TC increases focal length without degrading resolution, becoming a handy tool for minimizing your gear and it’s a compact alternative to bulky additional lenses. It has impressive optical performance for Sony cameras, precision engineered for versatility and reliability in a wide range of applications. The SEL20TC teleconverter is currently compatible with the SEL70200GM lens.