8 PCS M48X0.75 Focal Length Extension Tube Kit 3 5 7 10 12 15 20 30mm Extending Ring for

Feature: 1. Focusing Problem Elimination: The extension tube has M48 female thread and M48 male thread, which is used to solve the spacing problem in astrophotography and eliminate a series of focusing problems. Specification: Item Type: Focal Length Extension Tube Kit Material: Aluminum Alloy Gross Weight: 107g / 3.8oz Extension Tube Height: Approx.3mm / 0.1in, Approx.5mm / 0.2in, Approx.7mm / 0.3in, Approx.10mm / 0.4in, Approx.12mm / 0.5in, Approx.15mm / 0.6in, Approx.20mm / 0.8in, Approx.30mm / 1.2in Thread: M48X0.75 Use: for Astronomical Telescope Photography. Package List: 8 x Extending Ring