Feature: 1. Made of quality aluminium alloy material, high strength, corrosion resistant, sturdy and durable.2. Lightweight and compact size, easy to carry and use. 3. High precision double helical focuser for guider scope/finder scope Interface. 4. The solution for telescopes or telephoto lenses with sluggish focusing. 5. Wonderful accessory for astronomical telescope. Specification: Item type: Double Helical Focuser Condition: 100% brand new Material: aluminium alloy Weight: Approx. 120g Color: As picture shown Focusing Stroke: Approx. 10mm/0.4in Accuracy of focusing: Approx. 0.05mm Interface: 1.25inches, inner M42*0.75mm thread 1.25'' helical focuser, 10mm focusing stroke, lightweight. In the process of focusing, the inserted eyepiece or , etc. keeps no rotation and only makes linear motion, which is conducive to observation and shooting. Package List: 1 x Helical Focuser |