3" nosepiece for ARCO 3" (PrimaLuceLab, SKU: PL3600466 ) enables the ARCO 3" rotator to be mounted in focusers or adapters with a classic 3" socket (Ø 76.2 mm with screw clamp). The nosepiece is screwed on from the telescopic side of the rotator, creating a standard 3" push-in sleeve with the full inner diameter of the ARCO 3", which prevents vignetting even with full-frame matrices.

Key Features

• conversion: ARCO 3" flange → 3" insert sleeve (Ø 76.2 mm)
• full bandwidth 76 mm – no vignetting for 24×36 mm sensors
• optical length of only 15 mm – minimal impact on back-focus
• CNC machined from 6061-T6 aluminum, hard anodized – lightweight, rigid construction
• blackened and grooved interior - reduced reflections
• two M4 threaded holes – possibility of additional securing of the nose with locking screws (screws included)

Set components

• nosepiece 3" for ARCO 3"
• two M4 Allen screws

Technical parameters

• rotator side: flange adapted to ARCO 3"
• Outer diameter of the sleeve: 3" (Ø 76.2 mm)
• optical length: 15 mm
• Inner diameter: 76 mm
• material: aluminum 6061-T6, black anodized
• EAN: 8059020774110
• manufacturer: PrimaLuceLab – Italy

The PL3600466 is a quick way to mount the ARCO 3" rotator in 3" focusers, providing stiffness, full aperture and minimal back-focus gain.