Baader FRINGE KILLER Filter

Planoptically Polished with Phantom Coating Group (PCG).

The BAADER Fringe-Killer Filter minimizes unwanted blue fringing, comparable to a Minus-Violet-Filter, while retaining a very pleasing colour balance. This would be a contradiction in itself – only made possible by applying modern DWDM plasma assisted coating technology, allowing almost a hundred coating layers to be accumulated onto a planoptically polished substrate – without destroying the optical figure! This fineoptical tool will help a small refractor to really put the advertized magnification within reach. Performance rivals that of the most expensive colour correcting lens systems, costing 20 times as much!

(Note: for solar observation use only in combination with Baader AstroSolar Safety Film!)

Filter Properties:

• Offering the brightest image of all colour correcting devices in the industry. The Fringe-Killer is a must for even the smallest of refracting (lens type telescopes.
• Removes blue fringing as well as RED fringing above 656 nm!
• `Breaks` the intensity of the devastating false blue colour in a completely new way, never ever before manufactured as astronomical filter.
• Forms a `plateau` of eff. 50%transmission in the `blue` spectral region from 450nm to 480nm – being much more complex to produce than even the narrowest of all Nebula Filters.
• Retains the highest light transmission of all known colour correcting devices – be it filters or lenses – in all important deep sky wavelengths from 486/501 up to 656 nm. LIGHT is `the hottest commodity` for high magnification work.
• Built-in Infrared Blocker, ranging from 656nm to 1150nm, makes it the perfect tool for CCD work, as well as afocal projection-photography with digital cameras for Moon & Planets.
• Subtlest of colour variations remain visible in planetary surface detail, due to the excellent colour balance.
• Combine with our 31.7mm Red RG-610 colour filter, to receive an ultra narrow (70nm) wide H-alpha passband filter of unheared of 95% peak transmission at world‘s lowest price!.
• Combine with our NEODYMIUM Moon & Skyglow Filter (with Phantom-Group-Multicoatings) for breathtaking contrast on lunar and planetary surface detail!
• Planoptically polished, means perfect sharpness, even when mounted way in front of a binocular viewer, or during afocal projection (digital imaging).
• No deterioration of resolution with magnification at 300 times or more – as it would happen with the usual `flame polished` (raw polished) glass, commonly used for all sorts of filters!
• Coating: Plasma assisted, hardest, scratch proof and water impermeable dielectric coatings of almost 50 coating layers on either side, most carefully designed to extend equal tension onto either side of the substrate – in order to retain a highest quality optical figure.
• Will make the performance of a simple f/8 economy refractor look like a classic f/15 Fraunhofer-Achromate.