IDAS NBZ-II Filter 10nm 2"
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Vai al moduloA dual-band filter for narrowband imaging in a single session
The IDAS NBZ-II filter simultaneously transmits the red H-alpha line and the blue-green OIII lines, increasing the contrast of emission nebulae and allowing narrowband images to be obtained with just one series of exposures, without needing to alternate between multiple single-band filters.
Designed to work well even with very fast optics
The filter is compatible with telescopes and photographic lenses down to f/1.4, making it usable on virtually any standard optic and most fast photographic lenses. The 10nm bandwidth for H-alpha and 8nm for OIII is slightly wider than the 7nm dual-band filters of other manufacturers: this extra margin avoids the severe transmission loss (sometimes over 50%) that occurs with narrower filters when used on very fast optics (around f/2), making the NBZ-II suitable for both slow and fast systems without needing to change filters.
Technical specifications
| Parameter | Value |
|---|---|
| H-alpha bandwidth | 10 nm |
| OIII bandwidth | 8 nm |
| Filter thickness | 2.0 mm |
| Mount | 2" ring |
| Mount material | Aluminium |
| Optical coating | Multi-coating |
| Optics compatibility | Down to f/2 (also usable on slower systems) |
| Infrared blocking | Yes |
| Photographic use | Yes |
| Visual use | No (photographic only) |
| Suitable for nebulae and galaxies | Yes |
| Suitable for double stars | No |
| Suitable for Moon and planets | No |
Who it's recommended for
Suitable for narrowband astrophotography of planetary nebulae, emission nebulae and supernova remnants with telescopes fitted with a 2" focuser, particularly for those using fast astrographs who don't want to give up a universal filter that also works on slower systems. Made in Japan by Hutech Corporation under the IDAS brand.