OTA · 2011–
Takahashi Epsilon-180ED
Key specifications
| Aperture | 180 mm |
|---|---|
| Focal length | 500 mm |
| Focal ratio | f/2.8 |
| Optical design | Newtonian |
About
180 mm f/2.8 hyperbolic flat-field Newtonian astrograph, 500 mm focal length. Very fast hyperbolic primary with ED two-element corrector for a flat full-frame field; a long-standing favorite for fast deep-sky astrophotography.