M42 to M42 Adjustable Helicoid Macro Tube Adapter 17mm to 31mm - 4X Hot

Material: aluminum alloy This M42-to-M42 adjustable focusing helicoid acts as a macro tube adapter with a working range of 17mm to 31mm. It is especially useful for lenses that lack a focusing ring, providing precise manual focus adjustment and serving as a macro extension when needed. The adapter contains no electronic elements, so aperture and focusing must be set manually. Constructed from all-metal aluminum alloy, it holds the lens firmly while still allowing easy removal when not in use.