| This 1.25" UV and infrared blocking filter is an excellent choice for sharpening surface details in planetary images taken through the Celestron NexImage solar system imager. It is particularly effective at improving the contrast of Martian features. While the eye can’t see the IR radiation of sun-illuminated planetary surfaces, the sensitive imaging chips of many CCDs and webcams can be overloaded by the IR glow, blurring planetary detail. This filter sharpens planetary detail by blocking the invisible IR portion of the spectrum before it can overload the imaging chip. It also sharpens up the monochrome images of stars that are strong IR emitters in long exposure deep space images taken through other CCD cameras that do not have a separate IR filter. The filter uses multilayer ultrahard ion beam coatings deposited on an optically polished glass substrate. This process results in a dense, sealed, and highly scratch-resistant coating. The filter threads into the 1.25" nosepieces of the NexImage camera and most other CCD cameras. It will also thread into a 1.25" eyepiece, although its visual effects for eyeball observing are very limited. This filter is primarily for digital imaging. The filter has an extremely sharp cutoff at 690nm, but passes all of the visible red, including the important 656nm H-alpha emission line. This sharp cutoff, combined with the ghost-free images provided by the very low reflection multicoatings, prevents IR wavelengths from blurring fine detail in your digital images and yields pinpoint star images and fine planetary detail.
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