The area outside the microprism is the matte screen. Focusing is done by sight and requires practice as the transition from unsharp to sharp is gradual rather than abrupt. The matte screen helps you focus precisely with range.

• 微棱镜以外的区域是磨砂屏,对焦的过程是通过观察同时需要经验,因为景物被观察时从不清晰到清晰的变化是逐渐产生的而非突然出现的,磨砂屏能帮助您对远处和极近处景物精心准确对焦。