Antares ALP (Anti-Light Pollution Filter) 1.25" - JAPAN! (Pre-owned)
Regular price
$85.00 CAD
Couldn't load pickup availability
Pre-owned filter, coating still in great condition. Barely used.
ALP is a filter that blocks the visual spectrum except for wavelengths between 480nM and 510nM. This allow passage of ionized oxygen and hydrogen lines, but blocks light pollution reflectance from mercury and sodium vapor lamps.