Adjustable Lens Tubes

Exterior specifications （mm）	Ø30.5×26.2Ø30.5×38.9Ø30.5×51.6Ø55.9×26.2Ø55.9×38.9Ø55.9×51.6Ø17.8×26.2Ø17.8×38.9
Center hole specification	SM1（1.035＂-40）螺纹孔SM05（0.535＂-40）螺纹孔SM2（2.035＂-40）螺纹孔
External Thread Length	0.5in1.0in1.5in
product description	长度调节范围2.8mm-10.7mm长度调节范围2.8mm-23.4mm长度调节范围2.8mm-36.1mm
Weight（g）	471537131418289