Backyard Universe Secondary Mirror Spider for Sky-Watcher 250mm Newtonian Telescopes

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About this product

Backyard Universe Upgraded Secondary Mirror Spider for Sky-Watcher 250mm Newtonian Telescopes

CNC milled secondary mirror spider made of aluminium (EN AW-6061), matt black anodised, suitable for Skywatcher 250PDS/Quattro

This secondary mirror spider is manufactured on a modern CNC machining centre. The high-precision manufacturing ensures that the 1.8mm thick struts of the spider are perfectly aligned, and the diffraction-related spikes on bright stars appear razor-sharp. The light, stable design, optimised by FEM simulation, also significantly improves the collimation stability of the Newtonian.

What's In The Box

• 1 x secondary mirror spider suitable for e.g. Skywatcher 250PDS / Quattro (tube inner diameter 286mm), matt black anodised
• 4 x fastening screws M5x6 (for fastening in the tube)
• 3 x stainless steel studs M4x25 (with tip) for collimation
• 3 x studs M4x25 (with conical head) for collimation (black)
• 1 x stainless steel fastening screw M5x35 for fastening the secondary mirror holder
• 1 x stainless steel disc 40x15x1.5 (for the optional optimisation of the secondary mirror holder)

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