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Vai al moduloThe Baader f/2 Ultra-Highspeed Filter Set 3.5/4nm (H-alpha / O-III / S-II) combines the central wavelength pre-shift of the Highspeed range with the ultra-narrow passband of the Ultra-Narrowband range, for the absolute maximum contrast on ultra-fast astrographs such as Celestron RASA and Hyperstar.
The set includes an H-alpha filter, an O-III filter and an S-II filter, with an ultra-narrow 3.5/4nm FWHM passband and a CWL pre-shift specifically calibrated for optical systems from f/3.4 to f/1.8. The narrower passband allows for the maximum possible contrast even under heavily light-polluted skies (Bortle 9/8/7/6), further reducing the apparent size of stars and revealing the finest nebula details — even at the most extreme apertures.
Each filter is coated with Reflex-Blocker™ treatment, which eliminates unwanted reflections even in the presence of auxiliary optics, and with Life-Coat™ technology: a hardened coating that does not flake, does not degrade and lasts the filter's entire lifetime even under the most extreme conditions. The edges are blackened all around, with a visual indicator on the front side for correct orientation during mounting.
Available in 7 formats: 1¼" (31.8mm), 2" (50.8mm), 31mm, 36mm, 50.4mm, 50×50mm and 65×65mm.
| Parameter | Value |
|---|---|
| Filters included | H-alpha, O-III, S-II |
| Bandwidth (FWHM) | 3.5 / 4 nm |
| Recommended optical systems | f/3.4 to f/1.8 (ultra-fast astrographs) |
| Filter thickness | 2 mm |
| Coating | Reflex-Blocker™, Life-Coat™ |
| Brand | Baader Planetarium |
The ultimate set for astrophotographers using ultra-fast astrographs such as Celestron RASA or Hyperstar systems who want the absolute maximum contrast available, even under heavily light-polluted skies, for high-contrast imaging of emission nebulae in "Hubble Palette" style (SHO).
