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Home Filters Lunar & Planetary Filters Baader Premium Colour Filter Set 1.25 Inch
All the substrates of these premium filters are fine optically polished. These filters by far supersede the mediocre quality of common "flame polished" colour filters. These superb filters will complement any serious planetary observers instrument.
Transmission efficiencies for the three longpass-filters (Yellow, orange and red) peaks at 98 %, while the efficiency for the three bandpass-filters peaks at almost 70 percent - unheard of for a simple coloured glass-filter. All filters have standard 1.25" eyepiece filter threads, tested and optimized to fit allmost all eyepieces on the market. Each filter cell has a male as well as a female thread to allow stacking for narrower passbands.Fine optical polish and 2 mm thickness allows these filters to be inserted anywhere into the optical path without introducing astigmatism or other optical defects or abberations. For instance they can be used in front of a binocular viewer without degrading the image in any way. Substrates are free of striae and plane parallel polished to within 30 seconds of arc. This eliminates any double images or ghosting due to wedge errors in the glass. The set comprises three longpass and three genuine bandpass filters, which act similar to a nebula filter, so that only a small portion of the visual spectrum is transmitted to emphasize certain planetary surface detail. The set consists of following colours:Dark Blue (435 nm) Bright Blue (470 nm) Green (500 nm) Yellow (495 nm) Orange (570 nm) Red (610 nm)