[sasasum]

what does "cal 鏡" mean? why have to "cal 鏡" and how?

Many thanks.

[wilsonntm]

Cal 鏡即是"Calibrate鏡", 支鏡對焦唔準,而要進行校準。

[SleepingIII]

虽然可以读作“氯化钙镜”，但读作校镜应更为合适。顾名思义，即为校准镜头。