CCD sensors are sensitive over a very wide spectral range, extending well into the infrared. This is especially noticeable when shooting with short-focal-length and fast-aperture refractors. A barely visible, very noisy, and blurry double image behind the actual image can ruin a truly great shot.
The transmission of the blocking filter is optimized to block out the unwanted IR and UV range, allowing only visible light to pass through.
The filter has a 1.25" filter thread and can be easily screwed into the camera adapter or an eyepiece.
Technical Specifications Performance Optical Coating Multiple Mount Material Aluminum Mount 1.25" General Series Advanced Type Filter Design Blocking Filter Product Safety Manufacturer: NIMAX GmbH, Otto-Lilienthal-Str. 9, 86899 Landsberg am Lech, Germany, www.nimax.de
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