The NB3 filter is a dual line-pass filter which can be used with one-shot color (OSC) cameras such as
or astronomical OSC cameras.
Passing the red SII and the blue-green OIII lines, the NB3 filter enhances the contrast of these
lines found in emission nebulae without the time-consuming use of single-band filters. The resulting
images can be used for luminance contrast enhancement of traditional RGB-balanced images or creation
of images in various popular false-color palettes.
Note that a base filter which provides IR blocking is required in combination with this filter.