Luminescent emission nebulae, supernova remnants and planetary nebulae are all particularly beautiful objects pertaining to the night sky. This applies both to the simple process of visual observation, as well as to astrophotography. Nature illuminates such nebulae in specific spectral colours: the red light of hydrogen, the blue-green light of oxygen ions and also in the colours of sulphur and nitrogen ions. Nebula filters enable these colours to pass through whilst blocking the diffused light of the natural luminance of the sky and of light pollution. The result is a marked increase in contrast.
With the Nebula Booster NB1, the filter specialists IDAS are introducing a new, very high-performing filter of this type onto the market, and one that is not overly expensive! As the transmission curve shows, the filter has high transmission and is permeable for all relevant spectral lines, with a surprisingly narrow passband: A real nebula intensifier!
The filter is ideal for photographing large nebula regions since it enables the typical colours of these objects to pass and blocks the disruptive skyglow. The filter quickly and completely cuts off near infrared up to 1100 nanometres. This is important since cameras are sensitive to this range, but telescopic lenses are optimised for the visible spectral range and are faulty in the infrared range.
The Nebula Booster NB1 is available with two versions which cover both of the common filter thread sizes and can be screw-fitted to the housings of eyepieces or cameras.