harwayharry
16-01-2008, 05:52 AM
As new, only used a few times before I went from refractor to reflector - virtually indestructable in any case!!
For those who don't know this filter, below is an extract from Telescope.com.au
EXTRACT
1.25" Fringe Killer - 2458370
Item code 10406-033
Stock 3
Price $110.00
For refractors, for visual observing and CCD imaging. Offers the brightest image of all colour-correcting devices in the industry, making the Fringe-killer a must for event the smallest of refracting lens telescopes.
Reduces bluish and reddish secondary spectrum. Built-in IR blocker makes it the perfect tool for CCD work and afocal projection photography with digital cameras for moon and planets.
Combine with the Neodymium filter (sold separately) for breathtaking contrast on lunar and planetary surface detail. No deterioration of resolution with magnification of 300x power.
Plasma assisted, hardest, scratchproof and water impermeable dielectric coatings of almost fifty coating layers to retain highest quality optics.
AND FROM BAADER:
Baader Fringe Killer - Achromat owners rejoice! Baader Planetarium has taken minus violet filtration to a new level. The Fringe Killer brings a type of filtration, never before seen, to the amateur. Rather than simply trimming the shorter wavelengths at a chosen wavelength and slope like all other minus violet filters, the Fringe Killer carefully attenuates a specific region of the spectrum. This allowed Baader to tune the filter for maximum practical reduction of the most damaging defocused blue wavelengths, with only a faint yellow color shift - without dimming and lowering image contrast by resorting to reduction of the important green-yellow wavelengths to crudely restore an apparent color balance! (where the eye is very sensitive, and where refractors are their sharpest) The result is a filter that removes the majority of color fringe, without notably affecting image brightness, imparting strong coloration, or reducing contrast at important wavelengths. As any telescope owner knows, light is a valuable commodity for both planetary and deep sky viewing, and the fringe killer preserves every bit of light possible. Terrestrial observers will also find the qualities of this filter to be ideal for their needs.
For those who don't know this filter, below is an extract from Telescope.com.au
EXTRACT
1.25" Fringe Killer - 2458370
Item code 10406-033
Stock 3
Price $110.00
For refractors, for visual observing and CCD imaging. Offers the brightest image of all colour-correcting devices in the industry, making the Fringe-killer a must for event the smallest of refracting lens telescopes.
Reduces bluish and reddish secondary spectrum. Built-in IR blocker makes it the perfect tool for CCD work and afocal projection photography with digital cameras for moon and planets.
Combine with the Neodymium filter (sold separately) for breathtaking contrast on lunar and planetary surface detail. No deterioration of resolution with magnification of 300x power.
Plasma assisted, hardest, scratchproof and water impermeable dielectric coatings of almost fifty coating layers to retain highest quality optics.
AND FROM BAADER:
Baader Fringe Killer - Achromat owners rejoice! Baader Planetarium has taken minus violet filtration to a new level. The Fringe Killer brings a type of filtration, never before seen, to the amateur. Rather than simply trimming the shorter wavelengths at a chosen wavelength and slope like all other minus violet filters, the Fringe Killer carefully attenuates a specific region of the spectrum. This allowed Baader to tune the filter for maximum practical reduction of the most damaging defocused blue wavelengths, with only a faint yellow color shift - without dimming and lowering image contrast by resorting to reduction of the important green-yellow wavelengths to crudely restore an apparent color balance! (where the eye is very sensitive, and where refractors are their sharpest) The result is a filter that removes the majority of color fringe, without notably affecting image brightness, imparting strong coloration, or reducing contrast at important wavelengths. As any telescope owner knows, light is a valuable commodity for both planetary and deep sky viewing, and the fringe killer preserves every bit of light possible. Terrestrial observers will also find the qualities of this filter to be ideal for their needs.