365Astronomy No 550 Lunar & Planetary Filter Set - 1.25-inch
This high quality colour filter set contains 3 colour filters and a neutral density filter for planetary and lunar observations. It comes in a foam lined plastic screw top storage case.
Material: optical quality glass
#12 - yellow
#25 - dark red
#56 - green
ND96-0.3 - neutral density (grey) filter with 50% transmission level
DARK RED: above 150mm aperture. Offers extreme contrast above 200mm. Provides very high contrast of the Moon, polar caps of Mars and it's an excellent choice for observing Venus at daytime as it blocks blue, so the sky appears black
GREEN: from 60mm. An important universal contrast filter. Strong enhancement of surface features of the Moon. Very good for low magnifications. Enhances reddish structures in the Great Red Spot on Jupiter. Also good for Mars and Saturn.
DARK GREEN: Same effects as as green, but from 100mm. White spots in Satrun's atmosphere represented better from 200mm aperture.
DARK YELLOW: from 120mm. Increases contrast of surface features of the Moon, clouds of Mars and reinforces atmospheric structures of Jupiter (i.e. Great Red Spot).
YELLOW: same as dark yellow but from 80mm aperture. Very good for observing the Moon (reduces blue chromatic aberration of achromats, thus increases contrast)