HR Variable Coma Corrector (2-inch)

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Designed by renowned optical engineer Harrie Rutten, the HR Variable Coma Corrector eliminates coma, field curvature, and astigmatism in Newtonian reflectors — delivering sharp, ro und stars across the entire field of view. The 4-element EMC-coated optical design achieves a Strehl ratio of 0.98 at f/4 and 0.96 at f/3, with a fully corrected field diameter of 30mm. Unlike imaging-only correctors, the HRCC02 is a photo-visual design — it works for both astrophotography and visual observing without swapping accessories. The built-in helical focuser provides fine-focus adjustment for visual use with 2" eyepieces, while M42 and M48 camera adapters (both included) connect directly to your imaging setup. The variable spacer with laser-etched markings lets you tune the corrector for different Newtonian configurations. Works with parabolic Newtonians f/3 and slower — including fast imaging Newtonians where coma correction is most critical. Key Features 4-element optical design with EMC (Enhanced Multi-Coating) Strehl 0.98 at f/4, 0.96 at f/3 — diffraction-limited performance Photo-visual: built-in helical focuser for 2" eyepieces + camera adapters for imaging Variable spacer with laser-etched markings for tuning to your specific Newtonian M42 and M48 camera adapters included (HRCC02-00 model) 2" barrel with filter thread Ideal For Newtonian astrophotographers — eliminate coma for round stars across the full corrected field Visual observers with fast Newtonians — the built-in helical focuser delivers sharp edge-to-edge views through 2" eyepieces Fast f/ratio systems (f/3–f/5) — where coma correction has the biggest visual and imaging impact Show more