The Explore Scientific HR Variable Coma Corrector is a precision optical accessory engineered to combat coma, a common distortion in Newtonian reflectors that causes stars near the edge of the field to appear stretched or comet-shaped. Designed by legendary optical engineer Harrie Rutten, this corrector ensures pinpoint clarity across the entire image, especially critical for astrophotography.
With fully EMC-coated optics to suppress reflections and enhance light transmission, the corrector delivers maximum contrast and image quality. Its adjustable spacer ring includes calibrated markings for fine-tuned backfocus, allowing broad compatibility with a range of Newtonian setups — including fast f/3.9 reflectors like the BRESSER N20839.
A set of three thumbscrews secures the corrector firmly in place, while included M42x0.75 and M48x0.75 adapters offer flexible integration with your camera or imaging train. A protective cap keeps the optics safe between sessions.
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⭐ Features & Benefits
- Designed by Harrie Rutten, expert optical designer
- Eliminates coma distortion in Newtonian reflectors for pinpoint star shapes
- Adjustable spacer with calibration scale for flexible backfocus tuning
- Fully EMC-coated lenses for enhanced contrast and reduced internal reflections
- Compatible with fast scopes down to f/3.9 focal ratios
- Includes both M42 and M48 adapters for DSLR and astro camera integration
- Secures with three large thumbscrews — no tools required
- Protective dust cap included to safeguard optical surfaces
🌟 Who It’s For
- Astrophotographers using Newtonian reflectors
- Telescope owners seeking edge-to-edge image sharpness
- Advanced users with fast f/3.9–f/5 Newtonians
🎯 What You’ll Be Able to Do
- Produce astrophotos with sharp stars across the entire field
- Eliminate comet-shaped distortions common in wide-field imaging
- Achieve professional-quality results without upgrading your scope
🎒 What’s Included
- HR Variable Coma Corrector
- Adjustable spacer ring with calibration
- M42x0.75 adapter
- M48x0.75 adapter
- Protective cap
Specs
| Item Number | HRCC02–00 |
| Weight | 1 lb / 0.45 kg |
| Diameter | 69.3 mm |
| Height | 147.2 mm |
Warranty Information:
This product includes a Limited One-Year USA Warranty, which converts to the Explore STAR Transferable Extended Life of the Product Warranty when registered within 60 days of purchase.
To activate your warranty, register your product at:
www.explorescientific.com/pages/product-registration