Realistic R27 ED

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The Realistic R27 ED is an astronomical objective lens from the brand Celestron. The R27 ED stands for "Rayleigh 27" and "extra-low dispersion," which describe the lens's design and performance characteristics.The Rayleigh formula, a mathematical equation that estimates the resolving power of an optical system, states that the diffraction limit of resolution for a telescope lens with an aperture diameter of D is approximately 0.61λ/D, where λ is the wavelength of light. The R27 designation is a reference to this formula, indicating that the approximate resolving power of the R27 objective lens is 1.3 arcseconds.The ED designation, on the other hand, refers to the presence of extra-low dispersion (ED) glass within the lens design. ED glass helps to reduce chromatic Aberration, or the spreading of light into different colors, by minimizing the amount of chromatic dispersion within the lens, resulting in sharper and more accurate images.In summary, the Realistic R27 ED objective lens from Celestron is designed to deliver high resolution and low chromatic Aberration, making it an ideal choice for astronomical observations, especially for faint deep-sky objects and planets.