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Blocks night glow and airglow, sodium and mercury emissions (but not UV or IV).
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The Twist Lock Adaptor is an innovative 2″-1.25″ low-profile helical self-centering eyepiece adaptor, of metal construction, threaded to accept standard 2″ filters.
£42.00
This UV/IR cut filter blocks UV and IR rays to maintain the colour temperature you want, eliminating false colour fringes around bright stars.