IDAS NBZ-II Filter M52
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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. This M52 threaded-mount version is designed for direct installation on astronomy cameras and filter wheels with a threaded connection, a more compact alternative to the 2" ring version.
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 | M52 thread |
| 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 cameras or filter wheels with an M52 connection, 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.