The M98 → M68 adapter with stop-ring for ESATTO 3.5" LP (PrimaLuceLab, SKU: PL3600363 ) enables the connection of M68 × 1 threaded accessories to the M98 × 1 front thread of the ESATTO 3.5" LP focuser. The integrated stop-ring allows you to precisely set the adapter's screw-in depth and lock it in the optimal position, facilitating back-focus control and orientation of the attached device.

Key Features

• thread conversion: input M98 × 1 (ESATTO 3.5" LP) → output M68 × 1
• locking ring – precise position adjustment and secure adapter lock
• full internal diameter 68mm – no vignetting for full frame sensors
• CNC milled 6061-T6 aluminum, hard anodized – lightweight and rigid construction
• blackened, grooved interior - effective reduction of reflections, better contrast

Set components

• M98 → M68 adapter with stop ring
• Allen screw locking the ring

Technical parameters

• input thread: M98 × 1 (female)
• output thread: M68 × 1 (male)
• optical length: 7 mm
• Inner diameter: 68 mm
• material: aluminum 6061-T6, black anodized
• Compatibility: ESATTO 3.5" LP extractor and accessories with M68 × 1 thread
• EAN: 8059020774141
• manufacturer: PrimaLuceLab – Italy

PL3600363 is a practical solution when you need to precisely adjust the back-focus and connect a corrector, reducer or filter with M68 thread to the ESATTO 3.5" LP focuser, maintaining the full aperture and mechanical stiffness of the entire system.