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IDAS NB3 Contrast Boost Filter

The NB3 filter is a dual line-pass filter which can be used with one-shot color (OSC) cameras such as DSLR's 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 (see example at right).

NB3 Filter (with NGS filter to block IR) Bandpass Plot -- Click to enlarge
NB3/NGS filtered image example. The NGS filter provides the IR blocking required for using the NB3 filter. Click to enlarge
Veil Nebula - NB2/NB3 combined final image. Click to enlarge
Additional example: M8/M20 region in the DigiBorg blog.


More on other members of the NB filter family...

Emission Lines Filter Sizes Base Filter
NB1 Triple - Hβ+OIII, Hα 48mm & 52mm None required
NB2 Dual - OIII, Hα 48mm, 52mm, Canon Drop-in Required*
NB3 Dual - OIII, SII 48mm, 52mm, Canon Drop-in Required*
  * In-camera IR blocker works as the base filter.