M42 to M42 Mount Lens Adjustable Focusing Helicoid Macro Tube Adapter (17mm to 31mm) - Secure All-Metal Construction: This durable adapter ensures your lens fits snugly, providing stability during use and easy removal when needed. - Enhanced Macro Photography: Designed for lenses lacking a focusing ring, this adapter allows you to achieve stunning close-up shots by functioning as a macro extension tube. - Manual Control: The adapter contains no electronic components, requiring manual adjustment of aperture and focus, giving you full creative control over your photography. - Versatile Applications: - Perfect for macro photography of small subjects like flowers or insects, revealing intricate details otherwise missed. - Ideal for vintage lenses, allowing you to use modern cameras while retaining the classic lens benefits. - Compatibility: Designed specifically for M42 mount lenses, this adapter seamlessly integrates with a wide range of photography equipment. - Adjustable Length: The helicoid mechanism allows you to extend the tube from 17mm to 31mm, providing flexibility for various shooting scenarios. - Lightweight and Portable: Compact design makes it easy to carry, ensuring you never miss a shot whether you're on a photoshoot or exploring nature.