Fringe Killer Color Correction-Filter 1¼ & 2"
Description
1¼" and 2" Baader Fringe-Killer Color Correction-Filter
Planeoptically polished with Phantom Group Coating
The Fringe-Killer (Fringe = colour fringing) blocks unfocused light in the red part of the spectrum (IR) uo to 100% - but above all suppresses over 50% of the interfering stray light in the blue spectral range - without changing the colour impression of the image.
The most delicate details of lunar craters and planetary surfaces can be seen with a much higher contrast.
The Baader Fringe-Killer Color Correction-Filter prevents unwanted colour fringes in both the blue spectral range and in the NIR above 700 nm! The visual impact initially corresponds to a minus violet filter, as opposed to this but the image colour remains broadly balanced. In itself a contradiction in terms? It can only be implemented by applying modern DWDM plasma assisted coating technology, which allows the application of approximately 100 individual layers on a flat-optically polished face surface perfectly and reproducibly without compromising visual quality. This fine optical precision tool also allows inexpensive China-refractors to reach the promised imaging performance. The reduction of chromatic aberration corresponds to what is achieved by corrections-lens systems, which usually cost 20 times more.
FACTS AND FIGURES
- Is due to its construction both visually and photographically a very valuable aid
- Removes blue fringing as well as red fringing above 700nm.
- Forms in the range between 450 to 480 nm with a plateau at around 50% transmission rate, the coating becomes more complex to produce than even the narrowest Nebula filters.
- Achieved in the passband the highest transmission of all previously available colour fringe, whether filter or correction lens. From 486-656 nm all relevant deep sky wavelengths are completely transmitted. Visually this is enough light for even high magnifications.
- Above of 656 nm (H-alpha), at 660nm, the transmission sinks very fast. In the NIR at 670nm, transmission is already down to 50%, and at 690nm it is already close to zero. The NIR is fully blocked up to 1150nm. This way, details on planets are shown much clearer when using CCD/CMOS-cameras, too.
THE HIGHLIGHTS OF THE BAADER FRINGE KILLER COLOR CORRECTION-FILTER
- Provides the brightest image of all industrially produced colour error correction systems. Thus the Fringe Killer is a must for even the smallest telescopes.
- Removes blue fringing as well as red fringing above 700nm.
- Cancels the devastating intensity of the disturbing purple fringing in a new form, which was never implemented to date in astronomical filters
- Even weak nuances remain clearly visible in the planet due to the excellent colour balance.
- In conjunction with an RG-610 Red Filter produces a narrowband Ha-pass filter with an only 70 nm wide windows and 95% light transmission - at an incredibly low price!
- The combination with the Neodymium Skyglow Filter (with Phantom-Group-Coating) results in a balanced, breathtaking contrast to the observation of fine lunar and planetary details.
- Planeoptically polished for perfect sharpness, even when the filter is assembled well before the focal point (or binocular digital camera insert).
- No deterioration of resolution with high magnification - as would happen with flame-polished (raw polished) glass, commonly used for all sorts of filters!
- Hight Quality Coating: Plasma-enhanced dielectric coatings result in hard, scratch-resistant and waterproof filters. Almost 50 layers on either side, carefully positioned as not to impair the optical quality of the substrate surface
- Makes the performance of a simple f/8 economy refractor look like a classic f/15 Fraunhofer achromat. See it to believe it!
