William optics redcat 513/14/2023 The RedCat 51 Gen 2 body is made of a strong aluminum alloy and is anodized in a beautiful red color for strength and durability. RedCat 51II Body Design and Included Features With the APO performance, this telescope has virtually zero chromatic aberration. The Petzval design, which consists of four elements in three groups, also known as a Quad, produces a full-frame flat field, with an image circle of >43 mm (full-frame). The William Optics RedCat 51 Telescope optics are made from Ohara FPL53 synthetic fluorite glass for high contrast and extremely sharp results when used in both visual and photographic applications. The RedCat 51II also comes with a camera sensor tilt adjuster to help you get those great images. The RedCat 51 comes with 48 mm threads, so it is compatible with several different brands of digital and mirrorless cameras such as Canon, Nikon, Sony, Pentax, as well as the most popular dedicated astronomy camera manufacturers on the market today like ZWO and QHY. With the help of the Ohara FPL53 glass, full-frame camera sensors will see perfectly round stars to the very edges of their fields of view. This RedCat refractor has a 51 mm objective lens, a 250 mm focal length, and a fast f/4.9 focal ratio.
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