Feature: 1. High Definition: Magnification barlow lens adopts high definition 5x magnification, helps you see clearer and farther. 2. Excellent Performance: The auxiliary objective lens features a broadband coated lens with excellent image contrast and light transmission. 3. Premium Material: The microscope auxiliary objective lens is made of aluminium alloy and is robust, lightweight and durable. 4. Applicable: Camera lens with thread, M28.6x0.6mm pitch. Suitable for 1.25in / 31.7 mm astronomical telescope eyepieces. 5. Practical Accessory: Microscope camera lens can double total magnification power of your microscope and reduce the focus length. Nice accessory for astronomy lovers. Specification: Item Type: Auxiliary Objective Lens Material: Aluminium Alloy + Optical Glass Magnification: 5X Number of Lenses: 1 Piece Lens Coating: Broadband Coating Sleeve Material: Aluminium Alloy Interface Size: 1.25inch (Approx. 31.7mm) Thread Size: M28.6x0.6mm(0.02in) Pitch (Industry Term: Fine Thread). Package List: 1 x Magnification Barlow Lens 1 x Storage Box Note: Manual measurement please allow some errors.