Focusing Helicoid Adapter M42 to M39 10mm-15mm Adjustable Macro Extension Tube

Features: brand new and high quality Focus: manually. Front mount: M42 screw mount female (M42 x 1mm). Length: 10mm to 15mm (5mm movement distance for focusing). Material: aluminium alloy. Rear mount: M39 screw mount male (M39 x 1mm). Package Includes: 1 x Focusing Helicoid Specifications: Front mount: M42 screw mount female (M42 x 1mm) Rear mount: M39 screw mount male (M39 x 1mm) Length: 10mm to 15mm (5mm movement distance for focusing) Focus: manually Material: aluminium alloy. note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors the picture may not reflect the actual color of the item. Thank you!