聚焦系统
| 内部对焦（IF） |
Y |
| 最近聚焦距离 |
2 m |
| 光阑叶片数量 |
9 |
| 固定焦距 |
2.8 mm |
重量和尺寸
| 直径 |
122 mm |
| 滤波器大小 |
42 mm |
| 长度 |
242.5 mm |
| 重量 |
2340 g |
性能
| 镜头遮光罩 |
Y |
| 自动对焦 |
Y |
| 兼容产品型号 |
NEX Handycam |
| 手工对焦 |
Y |
另外
| 镜头结构（元素 /组） |
13/12 |
| 产品色彩 |
White |
300mm f/2.8 Super Telephoto Lens
Featuring a new high-performance optical design, a quiet high-speed SSM (Super Sonic Wave Motor) autofocus drive system with enhanced object tracking, and an anti-glare Nano AR coating, the SAL300F28G2 super telephoto Sony G lens delivers both high contrast and beautiful bokeh effects at levels far surpassing those of existing 300mm f/2.8 lenses. Take advantage of fast internal focusing and two DMF (direct manual focus) modes for tack-sharp images in any situation. Designed with outdoor use in mind, the front and back of the unit as well as the area around the focus ring are specially constructed to help prevent water penetration.
SSM (Super Sonic wave Motor)
Thanks to a new LSI drive circuit, the SAL-300F28GII offers faster, more accurate autofocusing with four times faster object tracking performance than the currently available 300mm F2.8 G SSM lens. The smooth, high-speed performance contributes to excellent response when shooting moving subjects.
Dust and moisture protection design
Designed with outdoor use in mind. The front and back of the unit, as well as the area around the focus ring, are specially constructed to help prevent water penetration. When used in combination with the SLT-A77 or SLT-A99, this lens contributes to a camera system that reliably withstands tough shooting environments.
2 DMF (Direct Manual Focus) Modes
Allow you to quickly revert to manual focus by just turning the manual focus ring of the lens.
Improved optical performance
The SAL-300F28GII is specifically developed for digital photography. Its high-contrast design will keep pace with the ever-increasing pixel count of digital image sensors. Beautiful background blur, one of the features of the G lens series, is now even more beautiful thanks to optimizations that reduce spherical aberration.
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.
Versatile Focus Hold
Four focus hold buttons in different lens locations, plus electronic slider focus range selector switch.
Nano AR Coating with nano-precision structure
The SAL-300F28G features the same Nano AR Coating found on the SAL500F4G 500mm lens. This recently developed proprietary Sony coating technology sharply reduces the reflection ratio to realize clear, crisp image quality with less flare and ghost from internal reflections.
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.
Lightweight Design
A strong, light magnesium lens barrel makes shooting more comfortable even on long wildlife or sports assignments.
