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The all-metal adapter is designed to fit the lens securely, yet can still be removed easily when not needed. Introduction: This tube useful for lens without focusing ring. And it can be used as macro extension tube. There is no electronic element in the adapter. Aperture and focusing must be manually control. Feature: Made of Anodized Aluminum in Black finish with high quality. The length of this Helicoid tube is 36mm (min) to 90mm (max), it offers a total of 54mm 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 Package Include: 1 X M65 to M65 Mount Lens Adjustable Focusing Helicoid Macro Tube Adapter - 36mm to 90mm