Houdini 20 mm 86° Coma-Correcting Eyepiece
The world's first coma-correcting eyepiece for Newtonian telescopes. Shipping today.
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 20 mm eye relief with foldable rubber eyecup
- Multi-coated optics combined with high transmission glass types and blackened lens edges for maximum light throughput
- Flat field requiring less than 0.7 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
Read more about the benefits of coma-correcting eyepieces.
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 | 20 mm |
| Apparent field of view | 86° |
| Field stop | 30.0 mm |
| Layout | 8 elements in 6 groups |
| Theoretical eye relief (center of field, to glass) | 20 mm |
| Useful eye relief (edge of field, to body) | 15 mm |
| Max. diameter | 64 mm |
| Overall height including eyecup | 140 mm |
| Barrel length | 35 mm |
| Weight | 570 gr |
| Barrel | 2 inch (50.8 mm) |
| Focal point | 2 mm above barrel |
| Field flatness | < 0.7 diopters |
| Angular magnification distortion | < 2% |
| EAN | 5419980565808 |
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.
