eMagTech 2X T2 3mm Extension Ring M42x0.75 Anodized Compatible with Telescope T and Camera Mount

T2 extension ring compatibility compatible with telescope T ring adapters and compatible with camera T mount systems using M42x0.75 thread for a secure fit in astro imaging and visual observation setups 3 mm T2 spacer for backfocus this thin ring adds 3 mm optical path to fine tune sensor to focal plane distance optimizing reducer or flattener spacing and helping achieve focus across the field M42x0.75 thread precision machined to the T2 standard for smooth engagement helping limit tilt or wobble between components and keeping the optical axis aligned during deep sky or planetary imaging Aluminum alloy anodized finish lightweight build with matte surface reduces stray light and reflections supporting repeated assembly in home observatories portable rigs classrooms and outreach events Easy integration and versatile use works with T ring adapters extenders filter wheels focusers and off axis guiders enabling quick spacing changes for telescopes field nights or studio lens tests