1、Applicable Model: Our T2 lens mount adapter ring is suitable for Samsung NX micro SLR Camera with M42x0.75 thread. 2、Height Regulation: The height adjustment valve on our micro SLR camera adjustment valve can adjust the eyepiece height from 67mm to 80mm (2.63 to 3.14in). 3、Diameter Control: The diameter adjustment valve on our micro SLR adapter can adjust the diameter of the eyepiece from 41.5mm to 44.5mm (1.63 to 1.75in). 4、Hollow Design: Micro SLR adapter ring adjustment valve does not affect the focusing wheel, and both sides do not affect the adjustment of the focusing hand wheel. 5、Aluminum Alloy Material: Micro SLR camera lens mount adapter ring and adjustment valve is simple and practical, easy to install, aluminum alloy material, can be used for a longer time.