2-inch (M48) narrowband pass filter for increasing visual and photographic detail in emission and reflection nebulae with larger aperture telescopes
Super Nebula High-Contrast filter. Bestsuited to larger aperture telescopes 200mm and greater, it strongly rejects the pollution light of sodium and mercury vapour lights as well as natural airglow and allows nebulous light to reach the eye or your CCD camera with dramatically enhanced detail. Great for problem sky gradient in your astro-photos.
The ProStar Nebular enhancement filter strongly rejects the light of sodium and mercury vapor lights as well as natural airglow and auroral emissions. M27 is one classic example of its outstanding contrast performance.
Strong nebular emission spectral lines, transmitting in the visually sensitive regions primarily at 486nm and 496 to 501nm (Oxygen-III, or OIII) and (Hydrogen Beta), are passed through the filter with high transmission percentages. It allows nebulous light to reach the eye with dramatically enhanced detail while the effects of unwanted suburban lights are greatly reduced. The contrast between galaxies and the background night sky is also typically enhanced by the filter, but because galaxies emit light in a much broader range of wavelengths than nebulae, the effect is generally not as dramatic in these cases.