Baader Planetarium Yellow 495nm Long-Pass Filter, 2" Eyepiece FCFY-2

Find the Baader Planetarium FCFY-2 Yellow Long-Pass Filter, a high-quality accessory designed specifically for 2" eyepieces, offering a bandpass at 495 nm. This filter boasts an impressive 98% transmission efficiency, making it an excellent tool for capturing bright planet and cometary details. Unlike common "flame polished" color filters, Baader Planetarium's astronomy filters are crafted with meticulous attention to detail, ensuring superior quality. The fine optical polish and 2 mm thick glass allow these filters to be seamlessly integrated into the optical path, without introducing astigmatism or other defects. This means they can be used in front of a binocular viewer without compromising the image quality.The substrates of these filters are free of striae and are plane-parallel polished to within 30 seconds of arc, eliminating any double images or ghosting due to wedge errors in the glass. The filter cell features the largest clear aperture of any telescope filter on the market, ensuring complete freedom from vignetting at any focal length.The front "crown" of the filter incorporates milled notches, making handling and threading in the dark a breeze. All surfaces are treated with a 7-layer Multi-Coating, resulting in a mere 0.25% residual reflection. This is the most elaborate coating ever applied onto amateur color filters, ensuring a filter free of any false reflections under any incident angle of light.Light is a crucial factor in all planetary observation, especially during high magnification work. The 7-layer MC-coatings not only provide a brighter image but also prevent the softening effect of scattered light, which can obscure subtle features in planetary detail. The meticulous attention to coatings and perfect optical figuring are the reasons why the image contrast through these premium filters is so rock-solid. Experience the difference with the Baader Planetarium FCFY-2 Yellow Long-Pass Filter, a must-have for any astronomy enthusiast.