Corrects coma in fast Newtonian telescopes Delivers pinpoint stars across the entire field of view Maintains the telescope's native focal length and magnification Optimized for wide-field astrophotography Description FAQ Specifications In the Box Downloads Warranty Sky-Watcher Quattro Coma Corrector The Sky-Watcher Quattro Coma Corrector is an essential optical accessory engineered to eliminate the inherent comatic aberration in fast Newtonian astrographs. It delivers stunningly sharp, pinpoint stars from the center to the very edge of the field of view. This corrector ensures that the native focal length and magnification of your telescope remain completely unaltered, preserving your original image scale for wide-field astrophotography. Eliminate Coma for Edge-to-Edge Field Sharpness Fast Newtonian reflectors, like the Sky-Watcher Quattro series, produce a visual artifact known as coma, which distorts stars at the edge of the field into comet-like shapes. The Quattro Coma Corrector's optical design specifically counteracts this aberration, transforming distorted peripheral stars into the sharp, round points required for high-resolution imaging. This allows you to use your entire imaging sensor without cropping away compromised data. Preserve Your Telescope's Native Magnification Unlike reducer/correctors that shorten your telescope's focal length, the Sky-Watcher Quattro Coma Corrector functions at a 1x magnification. This is a critical feature for imagers who have carefully matched their camera and telescope for an optimal image scale. You get the full benefit of coma correction without changing the field of view or resolution your optical system was designed for. Optimized for Wide-Field Imaging This corrector is designed to illuminate large imaging sensors, making it the ideal match for wide-field targets like the Andromeda Galaxy (M31) or the vast hydrogen clouds of the North American Nebula (NGC 7000). By ensuring the entire corrected field is sharp, the Quattro Coma Corrector enables you to produce clean, professional-grade astrophotographs that are free of distracting optical errors. What is the primary function of the Sky-Watcher Quattro Coma Corrector? The primary function of the Sky-Watcher Quattro Coma Corrector is to correct for coma, an optical aberration inherent in fast Newtonian telescopes. This results in sharp, pinpoint stars across the entire photographic field, especially near the edges. Does the Quattro Coma Corrector change my telescope's focal ratio? No, it does not. The Sky-Watcher Quattro Coma Corrector is a 1x corrector, which means it does not alter the telescope's native focal length or focal ratio. Your f/4 telescope will remain f/4, preserving your original image scale and field of view. How will the Quattro Coma Corrector improve my images of the Rho Ophiuchi cloud complex with an f/4 Newtonian? When imaging a dense, wide starfield like the Rho Ophiuchi region with a fast f/4 Newtonian, stars at the edge of the frame would normally appear stretched and comet-shaped due to coma. The Quattro Coma Corrector corrects this, ensuring that the thousands of stars in the field, from the bright star Antares to the faintest background members, are rendered as sharp, round points across your entire sensor. Is the Sky-Watcher Quattro Coma Corrector only for Sky-Watcher telescopes? While it is optically matched for the Sky-Watcher Quattro series of imaging Newtonians, this coma corrector can often be used successfully with other fast Newtonian telescopes. However, achieving optimal results depends on matching the corrector's required back focus, which may require additional spacers or adapters for non-Quattro telescopes. Do I need a coma corrector for visual observing, or is it just for imaging? While coma is most obvious in astrophotography, it is also visible through an eyepiece, especially with low-power, wide-field eyepieces. Using the Sky-Watcher Quattro Coma Corrector for visual work can provide a more pleasing, "refractor-like" view, with sharp stars across the entire field of view, not just in the center. Will I need to add spacers to achieve the correct back focus with the Quattro Coma Corrector? Achieving the correct back focus (the distance from the corrector's flange to the camera sensor) is critical for its performance. Whether you need spacers depends on your specific camera and imaging train configuration. The corrector is designed to reach focus with standard DSLRs and dedicated astronomy cameras, but you should always confirm the required back focus distance for your setup. Corrector Type Coma Corrector Magnification Factor 1x (Unaltered) Primary Application Astrophotography with fast Newtonian Telescopes Sky-Watcher Quattro Coma Corrector × 1 Dust Caps × 2 Sky-Watcher 2-Year Limited Warranty
