Kendrick "Baader" Astro Solar Filters are full aperture filters (some are "Off Axis" type, if indicated) for all the most commonly used telescopes in amateur astronomy. The cells are aluminum and all have three nylon thumb screws to facilitate a secure fit on the front of your telescope. The filter material itself is the famous BAADER AstroSolar Film. This film has set a new standard for white light filters and gives a very pleasing and high resolution image. The image color is a bluish white. Optical quality: This highest precision film consistently produces strehl ratios of 94 to 96 percent at interferometric tests - thus it performs optically like a Fluorite Triplet Lens by Carl Zeiss or Astro Physics (Interferometric test results). With Baader AstroSolar filters the Sun appears in it's real color - Neutral White. Other films and most glass filters produce a blurry Bluish or Reddish Solar image, thereby cutting part of the spectrum. Especially with an Orange Sun, it is very hard to see faculae regions which are visible predominantly in the Blue wing of the spectrum. Eye safety: AstroSolar is essentially free from pinholes, since - other than with even the most expensive glass filters - it is coated on both sides, so that the chance of two pinholes overlapping each other is extremely faint. Baader AstroSolar safety film has been approved for eye safety by the National Bureau of Standards in Germany, the PTB. Unlike any other Sola

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