HAYEAR単眼MAX 300X ズームCマウントガラスレンズアダプターf/工業デジタル顕微鏡カメラ対物Objective Magnification Power by 0.7 - 4.5X(about 10 - 300X on the 21 inch display)1.0X C-mount adapterWorking distance: 100mm-115mmMonocular 300X Industry Zoom C-mount Lensfocusing mechanism:Focusing hand wheel tightness is adjustable,focusing range 15mm & 40mm