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In search for exceptional stars, the field flattener is often the only thing visible. It is not flashy like a telescope or famous like a camera, but it takes astrophotography from "almost there" to amazing. The focus plane of a reflector telescope is naturally curved. This subtle optical property makes the edges of the stars stretch into soft arcs rather than sharp points. This is fixed by a field flattener, which changes the shape of the light path so that the whole picture sensor is in focus from corner to corner. As a result? Find stars all over the frame, not just in the middle. In a technical sense, flatteners are sets of multiple lenses that fix field curvature without changing the magnification. They keep your telescope's original focal length while improving the star shape, unlike focal reducers. When it comes to astrophotography, this only means one thing: regularity. A flattener makes sure that every photon lands exactly where it should, whether you are taking pictures of big nebulae or small star groups.
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Highlighted Products
Apertura 0.8x Reducing Flattener for 90 mm Triplet APO Refractor
Utilizing a corrected field of view at the extremes of an APS-C sensor, the Apertura R-FLAT 0.8x Reducing Flattener improves the Apertura 90 mm Triplet APO Refractor. It converts the f/6 90 mm scope into an f/4.8 astrograph, producing a broader field of view and more signal per pixel.
Hotech 2" SCA Self-Centering Field Flattener
Made with a Hotech 2" SCA Field Flattener, this fixes field curvature in refractor telescopes with focal ratios between f/5 and f/8. It features a Self-Centering Adapter (SCA) technology to guarantee the flattener is correctly positioned in the focuser and functions at its optimum. The telescope's original field of view is maintained since this flattener does not affect the focal length
Sky-Watcher Focal Reducer Field Flattener 0.77x for Esprit 150ED
Established for the Esprit 150ED APO Refractor, the Sky-Watcher Focal Reducer Field Flattener is a high-performance accessory that improves optical performance for astrophotography by lowering the focal ratio, so enabling shorter exposure times and maximum light transmission, producing sharp, distortion-free images.
William Optics Adjustable Flat61 for Z61
Owning a ZenithStar 61 telescope, a need of an adjustable flat-61 corrector by William Optics to takes astrophotpgra[hy sessions to the next level. With its 43 mm field of view, this corrector is suitable for both full-frame and APS-C image circles. Excellent performance on enormous astronomical objects like Andromeda is achieved by its 2-element optical design, which provides excellently formed stars across the frame with a 360 mm focal length. Compatible with DSLRs, mirrorless cameras, and astrophotography cameras, the device has an adjustable spacing of 12.9 mm. To install, just remove the stock visual back and thread it according to your setup's specifications to get the perfect backfocal distance.
1X 2" Field Flattener - Sample R2
Use this field flattener to subtly improve photos. The Long Perng 104 mm f/6.25 triplet S650G-A refractor is the one that brings out the best in it. This flattener helps keep color aberrations at bay and delivers sharp details thanks to its fully multi-coated lenses. An M42 output allows for a threaded imaging train, and the housing, which is glossy black with red anodized aluminum bands, has a 2" barrel connection, making it compatible with most refractors in use today. With its 55 mm rear focus, it is straightforward to construct an image train behind the flattener, as is the norm in the industry.