Sky-Watcher Light Pollution Filter 1.25"

LIGHT POLLUTION FILTER 1.25"
FILTER AGAINST DISTURBANT LIGHT POLLUTION IN CITIES

These filters in their black anodised aluminum frames are designed to filter out the disturbing light of mercury vapor lamps and other light contaminants while allowing critical H-alpha and H-beta wavelengths to pass better than competitive filters. Bright, light-polluted skies appear much darker and the contrast between sky and object is visibly enhanced. This contrast enhancement effect is especially important in mists. Unlike stars, fog only emits light in a very limited wavelength range. These filters allow maximum transmission of the important wavelengths in H-alpha, H-beta, and the two lines of ionized oxygen, which are the most important wavelength ranges for nebulae. Observations of galaxies and star clusters also benefit from this filter, though not so much. Furthermore, the contrast is improved with reddish details on planets. This filter works with all telescope sizes but is especially well suited for telescopes up to 114 mm diameter, where other filters take away too much light.

Delivery:

Filter 1.25"
Storage box

Type: Contrast enhancement filter
Connection: 1.25" (28.5mm) filter thread