Backyard Universe Primary Mirror Mask for Sky-Watcher 250mm Newtonian Telescopes

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Backyard Universe Primary Mirror Mask for Sky-Watcher 250mm Newtonian Telescopes

CNC milled aperture ring made of matt black aluminium (EN AW-6061), suitable for Skywatcher 250PDS / Quattro. 

This precisely manufactured aperture ring, for mounting on the primary mirror, reliably covers the mirror brackets and the outer area of ​​the primary mirror, thus helping to avoid unwanted diffraction effects caused by the brackets and a sloping mirror edge. 

A 2mm chamfer in the inner ring minimises unwanted residual reflections on the primary mirror from the inner edge of the aperture. 

Please Note:

All primary mirror masks for Skywatcher 250 Quattro/PDS have holes for six clamps. They fit all 10" Skywatcher Newtonians with six mirror clamps!

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