APS-C 镜头的5大优点:
1. 便宜
2. 轻便
3. The smaller APS-C sensor effectively minimizes the field of view by about 1.5, so that a 300mm lens has the same field of view as a 450mm lens on a 35mm. This means that when using lenses made for the 35mm format on APS-C cameras, the fact that the central "sweet spot" of the lens is used can result in an improved resolution especially at the borders of the image.
4. The smaller sensor is possible to construct much lighter and smaller telephoto lenses.
5. The smaller sensor also allows greater depth of field by increasing the distance between the subject and the image sensor (for the same "frame of view").