Fangrui Product Details Fangrui Product Details Made Of Metal In Black Finish With High Quality. The Length Of This Helicoid Tube Is 17mm (min) To 31mm (max), It Offers A Total Of 14mm Movement Distance For The Lens Focusing. You Can Use M65 Screw Mount Lenses, Such As Carl Zeiss Or Pentax 65mm Screw Mount Lenses, And Even Enlarger Lenses. This Helicoid Tube Is Useful For Those Lenses Without Focus Ring, Tube Offers Fine Focus Control For Macro Photography. It Could Be Used As Macro Barrel. Automatic Diaphragm, Auto-focusing Will Not Operate Correctly While Using This Adapter. Manual Focusing With A/m Mode Metering Is Ok With The Adapter. Compatible With:m65 Lens Camera Colour:black Material:metal Package Contents: 1 X M65 To M65 Mount Lens Adjustable Focusing Helicoid Macro Tube Adapter - 17mm To 31mm Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.