Feature

●Easy to install, perfect replacement for the old or damaged one, reliable to use.
●Made from high quality aluminum alloy, which is wear?resistant and not easy to damage.
●Using fine workmanship CNC technology, the accuracy is higher, durable.
●The female thread specification of the interface is M42x0.75mm, the male threadspecification is M42x0.75mm.
●Various sizes of 3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm are suitable for different models.

Description

Spec:
Item Type: Lens Extension Tubes
Material: Aluminum Alloy
Color: Black
Product Size: Approx.3mm / 0.12in, 5mm / 0.20in, 7mm / 0.28in, 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 30mm / 1.18in, 12mm / 0.47in
Application: Extend the focal length of the primary mirror of the astronomical telescope
Extinction Treatment: Internal with extinction thread
Interface Female Thread Specification: M42x0.75mm
Interface Male Thread Specification: M42x0.75mm

How to Use:
1. Remove the objective lens.
2. Connect the telephoto tube to the eyepiece and the objective lens.
3. Then connect the objective lens.

packing list:
1 x 3mm Extension Tube
1 x 5mm Extension Tube
1 x 7mm Extension Tube
1 x 10mm Extension Tube
1 x 12mm Extension Tube
1 x 15mm Extension Tube
1 x 20mm Extension Tube
1 x 30mm Extension Tube