Triplet optical design corrects coma in fast Newtonian telescopes Engineered for a long back focus to accommodate complex imaging trains Ideal for use with Off-Axis Guiders, Adaptive Optics, and filter wheels Features Baader Planetarium's Phantom Group multi-coatings for maximum transmission Connects to accessories via a standard T-2 thread Removable stop ring allows the corrector to sit deeper inside the focuser Description FAQ Specifications In the Box Downloads Warranty Baader RCC I Rowe Coma Corrector The Baader RCC I Rowe Coma Corrector employs a new triplet lens design to deliver sharp, coma-free stars across the field in fast Newtonian imaging systems, connecting to your camera and accessories via a universal T-2 thread. This corrector is engineered specifically for imagers who require significant back focus to accommodate accessories like off-axis guiders, adaptive optics, or filter wheels without compromising optical correction. Triplet Optical Design for Fast Newtonian Coma Correction Unlike simpler coma corrector designs, the RCC I uses a triplet lens system designed by Dave Rowe to neutralize the coma inherent in parabolic mirrors. Each air-to-glass surface receives Baader's Phantom Group multi-coatings, ensuring that light transmission is maximized for brighter images and higher contrast, which is critical when imaging faint deep-sky objects. Long Back Focus: Integrating Guiders, Filter Wheels, and AO The primary advantage of the RCC I is its generous back focus distance, measured from its T-2 thread. This provides ample space to install a complete imaging train, including an off-axis guider for precise tracking, an adaptive optics unit for atmospheric correction, and a filter wheel for multi-band imaging, all behind the corrector. For additional mechanical flexibility, the corrector's threaded stop ring can be removed. This allows the body of the RCC I to be inserted deeper into the focuser, helping you reach focus with a wide variety of telescope and accessory combinations. Baader RCC I vs. MPCC Mark III: Choosing Your Coma Corrector Baader offers two excellent coma correctors, and the choice depends entirely on your imaging train's back focus requirements. Baader MPCC Mark III: This corrector is designed for the standard 55mm back focus common with DSLRs and many dedicated astronomy cameras. It is the ideal choice for simpler setups where an OAG or filter wheel is not needed, offering excellent correction in a compact form factor. Baader RCC I: The RCC I is the solution for complex setups. Its long back focus is specifically intended to accommodate the added path length of off-axis guiders, filter wheels, and adaptive optics. If your imaging train exceeds 55mm, the RCC I is the necessary choice. What makes the Baader RCC I different from other coma correctors? The key differentiator of the Baader RCC I Rowe Coma Corrector is its significantly long back focus. This is a deliberate design choice that allows astrophotographers to place accessories like an Off-Axis Guider (OAG), Adaptive Optics (AO) unit, or a filter wheel between the corrector and the camera sensor, which is not possible with standard coma correctors. How do I achieve the correct spacing for my DSLR with the Baader RCC I? While the RCC I provides a long back focus, you will need to add extension tubes to reach the correct spacing for your camera. Baader recommends their VariLock 46 T-2 Extension Tube (#2956946), which is continuously variable and includes a helpful pre-engraved mark to quickly set the perfect distance for a standard DSLR with a T-2 ring. Will the Baader RCC I work with my 8" f/4 Newtonian for imaging the Andromeda Galaxy (M31)? Yes, the RCC I is an excellent match for an 8" f/4 Newtonian. Its triplet design is made for fast optical systems and will produce sharp, point-like stars across the entire field of view, which is essential for capturing the full expanse of large targets like the Andromeda Galaxy (M31). Can I use the Baader RCC I for visual observing? The Baader RCC I is specifically designed and optimized for astrophotography. While you could theoretically use it for visual observation, its optical prescription is not intended for eyepieces and may not produce optimal visual results. For visual coma correction, Baader's MPCC is a more suitable choice. I have a ZWO OAG and filter wheel; is the RCC I a better choice than the MPCC for my Celestron 8" f/5 Newtonian? Absolutely. For your f/5 Newtonian, the combination of a ZWO OAG and filter wheel will require much more than the standard 55mm of back focus. The Baader RCC I is the correct choice here, as its long back focus is specifically designed to accommodate exactly this kind of accessory stack, whereas the MPCC would not provide enough spacing. What do the Phantom Group Coatings on the RCC I do? Phantom Group Coatings are Baader Planetarium's proprietary 7-layer broadband anti-reflection coatings. They are applied to every air-to-glass surface on the RCC I's triplet lenses to maximize light transmission and minimize reflections, resulting in higher image contrast and brightness, especially on faint nebulae and galaxies. Optical Design Rowe Coma Corrector (Triplet) Application Coma correction for fast Newtonian telescopes Coatings Phantom Group Multi-Coatings Camera Connection T-2 (M42x0.75) Male Thread Net weight (kg) 0.17 AR-Coating Phantom Coating® Group Barrel Size (in) 2" Optimized for focal ratio f/4 Outer Connection (eyepiece/-camera-sided) M42 x 0.75 (T-2), M48 Inner Connection (lens sided) M48 Outer Connection (lens sided) ø 2" (50.8mm) Working Range f/3.5 – f/6 Image Scale 1:1 Baader Planetarium Warranty
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