M81 25mm extension tube for ESATTO 3 (PrimaLuceLab, SKU: PL3600285) PrimaLuceLab opinie

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M81 × 1 extension tube 25 mm for ESATTO 3" (PrimaLuceLab, SKU: PL3600285 ) extends the optical path of the ESATTO 3" focuser by exactly 25 mm, making it easier to obtain the required back-focus when using the ARCO 3" rotator, correctors, reducers or filter wheels. The tube has an external and internal M81 × 1 thread, so it screws directly between the accessory's focuser, maintaining axiality and full rigidity of the mechanical connection.

Key Features

• precise optical length of 25 mm – easy adjustment of the back-focus budget
• Threads: M81 × 1 male (extractor side) / M81 × 1 female (accessory side)
• full internal diameter 76 mm – no vignetting for full frame matrices
• CNC milled body made of 6061-T6 aluminum, hard anodized - lightweight and corrosion resistant
• blackened and grooved interior – effective reduction of reflections, better contrast

Set components

• spacer sleeve 25 mm M81 × 1

Technical parameters

• input thread: M81 × 1 (female)
• output thread: M81 × 1 (male)
• optical length: 25 mm
• Inner diameter: 76 mm
• material: aluminum 6061-T6, anodized
• Compatibility: ESATTO 3" extractor and accessories with M81 × 1 thread
• EAN: 8059020773427
• manufacturer: PrimaLuceLab – Italy

The PL3600285 provides a simple and reliable way to achieve an additional 25mm of back-focus in astrophotography setups with the ESATTO 3" focuser, without compromising aperture or optical stability.