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Now the #3 booster engine is ignited. IDAS has set the new industry standard for OSC imaging. Following NB2, now NB3 is commercially available too. NB3 passes OIII and SII unlike NB2 (= OIII & Ha). These are dual-band filters while NB1 is tri-band. Followings are illustrated when each is used with NGS1 as a base filter. (As long as the filter blocks NIR, any can be used as a base filter. But there are some restrictions. So I will note later)
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.
More on other members of the NB filter family...
* In-camera IR blocker works as the base filter.
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*
What we can do with OSC camera is
Ha : R (NB2)
SII : R (NB3)
OIII : B+G (NB2) & B+G (NB3)
This allows to boost OIII efficiently.
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