About this product
Part Number: 2458431
Baader's new Narrowband CCD Emission Line & H-Alpha Filters deliver the absolute highest contrast deep sky images in H-Alpha, H-Beta, Oxygen III, and Sulfur-II, with the shortest exposures possible. Their ultra-narrow bandwidths have extremely high transmissions, while completely rejecting light pollution as well as the important blocking of longer wavelengths.
The high optical quality of Baader narrowband filters guarantees no loss in sharpness or contrast. Each substrate is fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers.
In addition to their special transmission properties, the Baader coatings were developed with another key goal in mind - to reduce the annoying reflections present in other astro-filters. To achieve this, along with excellent out of band blocking, required careful design and testing of the coating stacks.
Coatings are professionally applied in Germany by the most sophisticated equipment available today, ensuring high consistency for bandpass centering, transmission, and out of band blocking. The anti-reflection coatings are designed to prevent halos and balanced to prevent deformation of the substrates. The ultra-hard ionbeam deposition ensures the coatings will never degrade from use or normal cleaning.
|Average Rating (2 Reviews): |Brilliant quality Narrowband filters!
Wednesday, 21 August 2013 | Kayron
I bought the Hydrogen-Alpha (7nm), Sulphur-II and Oxygen-III filters for full Narrowband imaging on my ATIK 383L+ Monochrome CCD camera. These filters work extremely well and are very well priced. They produce no internal reflections and are parfocal (focus the camera with one and the other two will be focused at the same point).
Astrodon filters are meant to be of narrower bandwidths and therefore produce better contrast but to be honest, I do not think they are worth the extreme amount of money they cost over these Baader filters, which can produce stunning images.
Hydrogen Alpha Perfection
Thursday, 19 May 2011 | Mike
The 2" Hydrogen Alpha (7nm) is a beautiful filter that even comes in a beautiful box.
It feels well made and hasn't given me any trouble with internal reflections. It lets through a tight enough portion of Hydrogen Alpha wavelength light to give high contrast results even when imaging over strongly (floodlit, moonlit, airport) light polluted skies.
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