Parks 1.25" ALP Anti-Pollution Filter - Excellent Condition!
ALP (Anti Light Pollution) filters utilize state-of-the-art multi-layer coating technology to selectively filter out the mercury vapor and sodium light pollution. These filters are of tremendous value in the city since they block man-made light, and in dark sky locations they block neutral oxygen transmission (natural sky glow). ALP filters are not used for Lunar, planetary or terrestrial photography. Threaded to fit eyepieces and camera adapters.
We got this gently used filter in as a trade - it is in excellent condition & in the original plastic case with box.
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Filed under: Eyepieces & Accessories