The 500mm f/4.0 G Telephoto Prime Lens from Sony is a very long telephoto lens with a fast f/4.0 aperture that uses three ED (Extra-low Dispersion) glass elements and Nano AR lens coatings to maintain excellent contrast, and reduce internal reflections.
It is compatible with the Sony SteadyShot in-camera image stabilization system, and it has a Super Sonic Wave Motor (SSM) with a drive circuit four times as fast as previous versions. The autofocus is fast and quiet. When used with a compatible APS-C format DSLR, the equivalent focal length of this lens is an outstanding 750mm.
This lens does its part to fight the elements with interlocking weather-resistant seals in and around the focusing ring and other vulnerable points to protect against moisture, dust and moisture.