Baader RCC I Coma Corrector
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The Baader Planetarium RCC I Rowe Coma Corrector is a precision optical accessory designed to eliminate coma and field curvature in fast Newtonian and astrograph telescopes, typically those with focal ratios between f/3 and f/6. It delivers sharp, pinpoint stars across the full image circle, making it particularly valuable for astrophotographers using large-format sensors. Overall, it is a well-engineered and highly regarded corrector that justifies its price for serious imagers chasing optical perfection.
Key Features & Specs
| Compatibility | Optimized for fast Newtonian reflectors and astrographs with focal ratios from f/3 to f/6 |
|---|---|
| Optical Design | Multi-element lens group correcting coma, field curvature, and astigmatism simultaneously |
| Image Circle | Covers full-frame 35mm sensors and larger formats with minimal vignetting |
| Focal Ratio Effect | Introduces approximately 1.0x magnification factor, preserving native focal length |
| Connections | Standard 2-inch barrel with M48 threading for direct camera adapter compatibility |
| Build Quality | Robust aluminum alloy housing with fully multi-coated optical elements for contrast retention |
| Back Focus | Requires precise back focus distance of approximately 55mm for optimal correction |
Best for: Dedicated astrophotographers using fast Newtonian or astrograph telescopes who want edge-to-edge star sharpness across full-frame or larger sensors without sacrificing focal length.