Function:
1. Easy to install, perfect replacement for the old or damaged, reliable in use.
2. Made of high quality aluminium alloy, which is wear-resistant and not easy to damage.
3. Thanks to the CNC technology with fine workmanship, the accuracy is higher and more durable.
4. The internal thread specification of the interface is M42 x 0.75mm, the male thread specification is M42 x 0.75mm.
5. Different sizes of 3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm are suitable for different models.

Use:
1. Remove the lens
2. Connect the Tele Tube to the eyepiece and lens lens.
3. Then connect the lens.

Specification:
Item Type:Lens Extension Tubes
Material: aluminium alloy.
Colour: black.
Product size: approx. 3 mm, 5 mm, 7 mm, 10 mm, 15 mm, 20 mm, 30 mm, 12 mm.
Application Extend the focal length of the main mirror of the astronomical telescope
Erasing treatment: internal with extinguishing thread.
Interface Female Thread Specification:M42*0.75mm
Interface Male Thread Specification:M42*0.75mm

Package list:
1 x 3 mm 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

Note:
1. Please allow 1-2 errors due to manual measurement. Thank you for your understanding.
2. Monitors are not calibrated same, the colour of the item shown in the photos may differ slightly from the actual object. Please take the real one as standard.