The Sony SAL500F40G 500mm Lens is a very long telephoto lens with a very fast f/4.0 aperture that puts you right into the action for sports or nature photography. It features three ED (Extra-low Dispersion) glass elements and Nano AR lens coatings that fight flare, maintain excellent contrast and reduce internal reflections. When you're shooting sports or nature subjects, you're always fighting the elements and this lens does its part--it has interlocking weather-resistant seals in and around the focusing ring and other vulnerable points to protect against moisture, dust and grit.
The 500mm f/4.0 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 a whopping 750mm.
SSM (Super Sonic wave Motor): A built-in lens motor for faster automatic focusing with high torque at low speed, quick start/stop response and quiet, smooth operation
High Performance AF: Newly developed circuit board in the internal focusing mechanism achieves approx. 4x faster object tracking performance during auto-focusing than lenses using conventional circuit boards. This speed makes the lens perfect for capturing fast moving subjects
Nano AR Coating: Sony's Nano AR Coating with nano-precision structure contributes to high-quality images with reduced ghosting and flare. This technology features aligned microscopic asperities that reduce the effects of the reflective interfacial boundary on the surface of the lens
ED (Extra-low Dispersion) Glass: Three precision ED Glass lenses correct chromatic aberrations to provide extremely sharp telephoto images distant subjects as well as dramatic sports close-ups
Internal Focusing System: Internal lens elements move, so the overall length does not change -- creating an auto-focus zoom lens that doesn't affect the balance of your camera
2 DMF (Direct Manual Focus) Modes: Allow you to quickly revert to manual focus by just turning the manual focus ring of the lens
Versatile Focus Hold: Four focus hold buttons in different lens locations, plus electronic slider focus range selector switch
Dust and moisture resistance: The dust and moisture resistance design makes this lens appropriate for heavy-duty outdoor use, especially when combined with a DSLR that employs weather resistant measures
Lightweight Design: A strong, light magnesium lens barrel makes shooting more comfortable even on long wildlife or sports assignments