lensometer

例句：

1. 1. We used the lens meter to measure the focus of our camera lens.
   我们使用镜头测量仪来测量相机镜头的焦距。
2. 2.The lens meter is a useful tool for photographers to check the sharpness of their lenses.
   镜头测量仪是摄影师用来检查镜头清晰度的一种有用的工具。
3. 3. Lens meter readings are important for determining the correct aperture settings for your photography equipment.
   镜头测量读数对于确定您的摄影设备的正确光圈设置非常重要。