About this product
Part Number: BU2022-005
Backyard Universe Primary Mirror Mask for Sky-Watcher 150mm Newtonian Telescopes
CNC milled aperture ring made of matt black anodised aluminium (EN AW-6061), suitable for Skywatcher 150PDS/P/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.
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