for Telescope Extension Tube Set 8 PCS Lens Rings 3/5/7/10/12/15/20/30mm Extending Ring for Astronomical Telescopes Cameras Eyepieces Focal Length Kit M42x0.75 Compatibility with

<;br1. Please allow 12in error due to manual measurement. Thanks for your understanding.Item Type: Lens Extension TubesbrMaterial: Aluminum AlloybrColor: BlackbrProduct Size: Approx.3mm / 0.12in, 5mm / 0.20in, 7mm / 0.28in, 10mm / 0.39in, 15mm / 0.59in, 20mm / 0.79in, 30mm / 1.18in, 12mm / 0.47inbrApplication: Extend the focal length of the primary mirror of the astronomical telescopebrExtinction Treatment: Internal with extinction threadbrInterface Female Thread Specification: M42x0.75mmbrInterface Male Thread Specification: M42x0.75mmbrbrPackage Listbr1 x 3mm Extension Tubebr1 x 5mm Extension Tubebr1 x 7mm Extension Tubebr1 x 10mm Extension Tubebr1 x 12mm Extension Tubebr1 x 15mm Extension Tubebr1 x 20mm Extension Tubebr1 x 30mm Extension TubebrbrNote:

• Versatile Size Options: Extension tube kit available in sizes from 3mm to 30mm (3mm, 5mm, 7mm, 10mm, 12mm, 15mm, 20mm, 30mm), they suit different telescope with M42x0.75mm male and female threads, adding flexibility to your setup
• Quality Aluminum Alloy: Extension tube crafted from quality aluminum alloy, the tubes are wear- and built to withstand frequent use. The astronomical ring robust material enhances durability, ensuring -term reliability for both casual stargazing and serious astronomical work
• CNC Manufacturing: Using fine CNC technology, these telescope cover offer accuracy with a snug fit. The precise craftsmanship guarantees performance, minimizing light loss and maximizing clarity for detailed observations through your telescope
• Extends Length: Designed to extend the length of your telescope’s primary mirror, these tubes enhance performance for more detailed views of objects. They work well with cameras and eyepieces, making them a valuable accessory for observation and astrophotography
• Easy Installation Replacement: These focusing extension tubes are simple to install, making them a convenient replacement for old or damaged parts. They ensure of your astronomical telescope, supporting seamless switching between eyepieces and cameras during observation