8 Piece Lens Adapter Ring and Extension Tube Set, Includes Multiple Specifications. Astronomical Telescope Accessory Tube. Astronomical Telescope Accessories.(M42x0.75mmThread)

Item Type: Lens Extension TubesMaterial: Aluminum AlloyColor: BlackProduct Size: Approx.3mm / 0.12in, 5mm / 0.20in, 7mm / 0.28in, 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 30mm / 1.18in, 12mm / 0.47inApplication: Extend the focal length of the primary mirror of the astronomical telescopeExtinction Treatment: Internal with extinction threadInterface Female Thread Specification: M42x0.75mmInterface Male Thread Specification: M42x0.75mmPackage List：1 x 3mm Extension Tube1 x 5mm Extension Tube1 x 7mm Extension Tube1 x 10mm Extension Tube1 x 12mm Extension Tube1 x 15mm Extension Tube1 x 20mm Extension Tube1 x 30mm Extension TubeNote:1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.

• 【Easy to install】：Easy to install, replacement for old or damaged, to use
• 【Selected materials】：Made of high-quality aluminum alloy, wear-resistant and not easily damaged
• 【Fine workmanship】：using CNC technology with fine workmanship, higher , and long-lasting practicality
• 【Standard specifications】：The internal thread specification of the interface is M42x0.75mm, and the external thread specification is M4 2x0.75mm
• 【Multiple 】：3mm/5mm/7mm/10mm/12mm/15mm/20mm/30mm in various sizes suitable for different