Baader Fringe Killer Color Correction-Filter

• The fringe killer blocks defocused light in the blue spectrum, as well as in the red part of the spectrum (IR) above 700nm, usually seen in small achromat telescopes.
• The smaller details on craters of the Moon and planetary surfaces are so much more visible!
• Planeoptically polished; can be used well before the focal point of the optical system, without any loss of sharpness, as a single filter in front of a binocular for afocal projection with digital cameras.
• Provides the brightest picture of all industrially manufactured colour error-correction systems. Thus, the Fringe-Killer is a must for small refractors!

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.

The Baader Fringe Killer Overview

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!

Specifications

Additional Information

Manufacturer	Baader Planetarium
Weight (kg)	0.065
Transmission Range	multiple bands (see spectral image)
Filter Thickness (without cell)	2 mm
AR-Coating	Phantom Coating® Group, planeoptically polished
Filter Usage	Color Correction, IR-Cut
Filter mounted	Mounted (LPFC 6mm)
Type of Filter	Bandpass
Single or Set?	Single Filter
Filter shape	round