from alloy using advanced technology, these extenders feature internal antireflective threading to enhances your viewing clarities and light loss Expand your ' s potential and customizing your astronomical observations with this essential accessories kits, ensuring that every star night is capturing in perfect detail Whether you ' re observing the night from your backyard or taking a diving into universe at a remote dark site, these extenders multiple lengths ranging from 3mm to 30mm to suit any observational need Elevates your stargazes with this comprehensive set of 8 extenders, engineered to fit standard 2inch M48x0.75 thread mounts for seamlessly compatibilities Great for astronomical enthusiasts and amateur stargazers alike, this set caters to both professtional astronomers and those just starting their astronomical journey