The high transmission everywhere else delivers the shortest combined exposures possible with every detector. The Baader O-III perfectly isolates the two doubly ionized oxygen lines through a very sharp and narrow bandpass O- III filter, while the Baader SII will block all unwanted sodium light pollution and longer wavelengths. Baader's H-Alpha filters ultra-narrow bandwidth with extremely high transmission rates enables high-contrast deep sky images. Baader filters are truly designed to be stacked and combined due to the high optical quality and highly efficient anti-reflection multi-coatings. The premium quality coating is applied that offers optimum light transmission. The high optical quality of the Baader narrowband filters guarantees no loss in sharpness or contrast. Each substrate is a fine-optically polished plane parallel to deliver a smooth and accurate 1/4 wavefront over the entire surface. This special custom polishing operation sets Baader filters apart from the standard commercially precision polished filter substrates used by most other filter manufacturers.
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