Baader Planetarium 2″ Fringe Killer with IR-Cut Filter #2458375

$199.95

or 4 fortnightly payments of $49.99 with Afterpay More info

1¼” and 2″ Baader Fringe-Killer Color Correction-Filter

Planeoptically polished with Phantom Group Coating

Baader Fringe Killer

Baader Fringe Killer

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.

Example of Sirius with and without the Fringe Killer
For comparison please click

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 clearly visible colour correction of the Baader Fringe Killer. For comparison please click
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!
Weight.5 kg
Dimensions15 × 13 × 10 cm