SkyWatcher Quattro Coma Corrector
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The SkyWatcher S20204 Quattro Coma Corrector is a dedicated optical accessory designed to eliminate coma and field curvature when using fast Newtonian reflector telescopes, particularly the Quattro series. It delivers sharp, pinpoint stars across the full image circle, making it especially valuable for wide-field astrophotography. Overall it is a well-built, purpose-matched corrector that significantly improves edge-of-field performance at an accessible price point.
Key Features & Specs
| Compatibility | Optimised for fast Newtonian reflectors, especially SkyWatcher Quattro imaging Newtonians with focal ratios from f/4 to f/5 |
|---|---|
| Correction Type | Corrects coma and field curvature to deliver uniform, pinpoint stars across the full image field |
| Magnification Factor | Introduces a 1.15x focal length multiplier, slightly extending the effective focal length |
| Fitment | Inserts into standard 2-inch focuser drawtube for easy installation without additional adapters in most setups |
| Build Quality | Aluminium body with a matte black finish, fully multi-coated optical elements to minimise reflections and ghosting |
| Sensor Coverage | Designed to cover APS-C and smaller sensor formats with consistent correction across the image circle |
| Weight | Lightweight and compact, adding minimal load to the focuser during imaging sessions |
Best for: Astrophotographers using SkyWatcher Quattro or similar fast Newtonian telescopes who want noticeably sharper, coma-free stars from centre to corner without a complex or expensive optical upgrade.