IDAS NB1 Tri-Band Narrow Nebula Filter H-Beta, O-III, H-Alpha - T2 thread

IDAS NB filters from Hutech have been specially developed for astrophotography

The NB1 filter is a triple-line pass filter that can be used with one-shot color (OSC) cameras such as DSLRs, mirrorless system cameras, or astronomical OSC cameras.

The NB1 filter lets the red H-alpha line, the blue-green [O III] lines and the also blue-green H-beta line pass through and increases the contrast. You get narrow-band images with only one exposure series. The resulting images can be used to enhance the contrast of traditional RGB images or to create images in various common false color palettes.

The most important features of IDAS NB1 nebula filter:

Stronger stray light suppression than with the LPS-P2

Let H-beta, [O III], C2 (partially) and H-alpha through

Suitability for trichromatic imaging of emission line objects

Therefore especially suitable for gas nebulae

Using an RG610 results in a 19 nm wide H-alpha filter.

Suitable for comets (Swan bands)

High-quality anti-reflection coating

Particularly scratch-resistant hard coating

Absorption of urban scattered light (mercury, sodium vapour lamps, ...) and night glow

Blocks near infrared light, so an IR cut filter is therefore not necessary.

Exposure time extension - factor 4:

The IDAS NB1 allows an exposure time extension by a factor of 4, but allows the important lines in the deep-sky range (e.g. H-alpha and [O III]) to pass 90%.

To put it simply, you can expose four times as long until the sky background comes through, but the object appears much stronger and more contrasty in front of the background than without a filter.

Difference NB1 - NB2 - NB3 Nebula Filters:

All three filters are suitable for color and monochrome cameras, DSLR and mirrorless system cameras. A combination of these three filters allows extreme narrow-band images with monochrome and color cameras.

NB1: Triple filter with transmission at H-Beta, [O III] and H-Alpha. Furthermore, the filter blocks Near IR light, no additional IR cut filter is needed. The NB1 is the most versatile filter. We also recommend the filter for astromodified DSLR and mirrorless system cameras.

NB2: Dual band filter with transmission at [O III] and H-alpha. The contrast effect is very strong. The filter is well suited for color astrocameras with built-in IR-cut filter and for photography with pure reflecting telescopes without corrector, such as RC telescopes.

NB3: Dual band filter with transmission at in [O III] and [S II]. The contrast effect is very strong. This filter is ideal for the photography of objects that radiate in the [S II] range (sulfur). These nebulae often still have an [O III] component.

NBZ: Dual band filter with very narrow passband of 5-6 nm (ultra narrow band) in [O III] and H-alpha for extreme contrast.

Astrophotographic results obtained with this filter on Astrobin

Here you can find some astrophotographs made with this filter type: Link to Astrobin

Safety informations: PDF Download