idas filters

IDAS Nebula Booster #2 and #3


IDAS NB2 and ODW filters are expected to come in stock next week. (NB3 will be later) Each US price is as follows;

  • NB2-52 : $219.00

  • NB3-52 : $219.00

  • ODW-52 : $89.00

Each is only available at 52mm. No plan for other sizes as regular round-mounted.

This is IDAS’s new filtering “system” for one-shot color cameras to maximize the nebula emission’s S/N while capturing regular RGB broadband colors without re-focusing or taking apart the optical system during imaging session.

While NB1 performs alone, NB2 and 3 requires a base filter since they don’t block NIR themselves. But don’t be disappointed. I explain why…. Following is one example.

Base filter : NGS1 is the best match with NB2 and 3. But regular UV/IR blocking filter may be used too. IDAS LPS or NGS has still good advantage if the sky is light-polluted.

  1. For regular RGB color : ODW (as FMC full spectrum filter)

  2. For narrow-band nabula : NB2 or NB3

And blending in post processing.


Conventional 48mm UV/IR blocking filters can be set with 52-48 stepping ring as a base filter. But be sure Hutech adapters (for M42 for APS-C or smaller and M54 for full frame cameras) are optimized for IDAS filter thickness. You need to adjust the mechanical distance when non-IDAS filters are in place.


NB2 for OIII, Ha and NII

NB3 for OIII and SII

Again, as always, each emission line is intentionally set at shorter wavelength side and the transmission peak is the flat-top shape to minimizing signal loss after the spectrum shift. Very well designed as usual.

New: NB1 nebula filter from IDAS

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 NB1the 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.