with the structure, the focusing ring can be quickly clamped on the optical mode lens; and assembly and disassembly are convenient and positioning is accurate.
由于本实用新型采用了上述结构,调焦环可快速地卡装在光模镜头 上,拆装方便、定位準确。
the second version also has wider and deeper knurling on the focusing ring than the previous version.