HR Variable Coma Corrector (2-inch)

Designed by renowned optical engineer Harrie Rutten, the HR Variable Coma Corrector eliminates coma, field curvature, and astigmatism in Newtonian reflectors — delivering sharp, round 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