The Baader Fringe Killer Filter is a high quality UV/IR block which also removes violet and some blue light. Perfect for imaging and visual use with the smaller fast Chinese achromats and many semi-apochromats.
Makes the images from a cheap 80mm F5 achromat look considerably more expensive!
Works well in combination with the Astronomik CLS filter and also the Baader Longpass Red.
This article provides a comparison between the Baader Fringe Killer, Semi-Apo and Contrast Booster filters.
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