Delivering excellent imaging quality at an accessible price, it's the first zoom for the Alpha range offering a wide F2.8 aperture over its entire zoom range.
提供价位适中优秀的成像质量，这是第变焦的阿尔法提供超过其整个变焦范围内广泛象素光圈范围。
2
The beam is then shaped to fill the entire 20.3 cm diameter output aperture of the Schmidt-Cassegrain telescope.