CSA05 Series Ø1/2" Stackable Lens Tubes SM05 Threaded Connector Extension Tube Shading Tube

Product information Model CSA05-0.5 CSA05-1 CSA05-1.5 CSA05-2 CSA05-3 Tube Height 12.7mm 25.4mm 38.1mm 50.8mm 76.2mm Tube Diameter Ø17.8mm Thread Type SM05 (0.535 "-40)Internal And External Threads Weight 4.1g 7.7g 11.4g 15.3g 22.0g Material 7075 Aluminum Alloy Characteristic ►Stacked external thread design to construct a multi-component optical system; ►SM05 (0.535 "-10) thread, compatible with mounting Ø 1/2 inch optical components; ►Compatible with 16mm cage systems; ►Comes with 1 CSK05 snap ring; Optical commonly used thread size standard This is the unique thread of Thorlabs in the United States, not the commonly used optical thread. SM is the code for the thread of the sewing machine in terms of thread expression, but this company in the United States uses it to connect the internal and external threads of the optical lens and the sleeve. The nature of the thread is UNS, and the United States has a special thread with a tolerance accuracy of 2A / 2B. The sp