HR Variable Coma Corrector (2-inch)

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

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