Product no.: 15058Manufacturer: Skywatcher
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AP 120/900 ED telescope:
This refractor is well corrected for chromatic aberration and is an ideal telescope for high-contrast planetary observing. It is also a 'fast' ED apochromat, well suited to astrophotography. With its 120mm aperture and 900mm focal length, this doublet lens ED telescope gives an excellent image and collects around 290 times more light than the naked eye alone (with a fully dilated exit pupil of 7mm). The use of FPL-53 ED glass reduces visible chromatic aberration to virtually zero. ED (Extra low Dispersion) glass has very low colour dispersion and a low refractive index. Excellent correction of chromatic aberration is achieved by the combination of this special glass with other types of optical glass. Even higher contrast is achieved by the employment of crown glass from the German glass firm Schott. The Metallic High Transmission Coating on the lenses ensures high light transmission. Star clusters appear especially aesthetically pleasing in this refractor, with stars in the image often coming extremely close to being 'pin sharp'. In conjunction with an optional field flattener, it provides a sharp image across the entire field of view, and the 'fast' f7.5 aperture ratio is useful for photography as exposures can be kept very short despite the focal length. The telescope can also be used on smaller mounts as the relationship between aperture and OTA length means it only exerts a low leverage effect. The OTA has a solid 2-inch Crayford focuser with 1:11 reduction ratio for fine focusing - especially important in astrophotography. Together with the appropriate accessories, the refractor can also be used as a powerful spotting scope for a wide range of nature watching applications. The OTA is also visually a real gem, featuring an elegant design for the both OTA and finder scope in an aesthetically pleasing shimmering black. The white dew shield and tube ring clamps are a stylish contrast in the overall design.
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