Houdini 9 mm 86° Coma-Correcting Eyepiece
9 mm coma-correcting eyepiece for Newtonian telescopes. Available in March 2026.
Price includes VAT. For non-EU customers 20% VAT will be deducted at checkout.
Description
- Well-corrected ultra-wide 86° field with sharp star images across the field even with fast f/3 Newtonian optics
- Comfortable 19 mm eye relief with foldable rubber eyecup
- Multi-coated optics combined with high transmission glass types and blackened lens edges for superb contrast
- Flat field requiring less than 0.5 diopters of accommodation across the field
- Low distortion delivering constant magnification across the field
- Handy size and weight with comfortable rubber grips
- Filter-threaded barrel with safety kerfs that do not lock, slip, or tilt in the focuser
- Eyepiece cap with glow in the dark focal length
Will it work in my telescope?
The Houdini eyepieces were designed for Newtonian telescopes with parabolic mirrors, but they will also work well with any telescope with a focal ratio of f/6 or slower (f/8, f/10, etc.). This includes slow refractors and most popular Schmidt-Cassegrain telescopes.
The eyepiece is not recommended for use with fast telescope systems without parabolic mirror, such as f/5 APO refractors.
Specifications
| Focal length | 9 mm |
| Apparent field of view | 86° |
| Field stop | 13.5 mm |
| Layout | 9 elements in 7 groups |
| Theoretical eye relief (center of field, to glass) | 19 mm |
| Useful eye relief (edge of field, to body) | 15 mm |
| Max. diameter | 48.5 mm |
| Overall height including eyecup | 127 mm |
| Barrel length | 31 mm |
| Weight | 310 g |
| Barrel | 1.25 inch (31.75 mm) |
| Focal point | 0.5 mm below barrel |
| Field flatness | < 0.5 diopters |
| Angular magnification distortion | < 2% |
| EAN |
See also the Specifications and Performance of Houdini eyepieces.
Warranty
All Houdini eyepieces feature full multicoating, blackened lens edges, high index glasses, a fold-down eye guard with a cover with glow-in-the-dark labeling, comfortable rubber grips, a barrel with kerfs for trouble-free locking, and filter threads.
Houdini eyepieces are designed in-house and extensively optimized using our proprietary Eyepiece Design Software. Every eyepiece is individually tested in our shop to ensure it meets our high optical and cosmetic standards.
Houdini eyepieces are warranted to be free of manufacturing and/or workmanship defects for lifetime from the date of purchase. This warranty applies to the original purchaser only and is non-transferable. Defects covered under this warranty are limited to optical coating and cementing, and normal mechanical operation of the product. The warranty does not include defects caused by mishandling, alteration, defects of subjective nature, or normal wear and tear caused by use.