S8140 M42 internal thread spiral focusing, inner diameter 1.25 with M42 port

S8140 M42 internal thread spiral focusing, inner diameter 1.25 with M42 port

Main mirror interface: M42 * 0.75 internal thread, length: 4MM

Navigation port: 1.25 inches, M42*0.75， Length: 7.5mm

Length: 52MM-62MM

Focusing accuracy: about 0.05mm