Eyepiece · 2015–2021
Celestron Ultima Duo 13mm
Key specifications
| Focal length | 13 mm |
|---|---|
| Apparent FOV | 68 ° |
| Barrel size | 2" |
| Eye relief | 20 mm |
All specifications
| Elements | 8 |
|---|
About
13mm Ultima Duo eyepiece (discontinued): an 8-element design with a 68-degree field, 20mm eye relief, and an integrated 42mm T-thread under the eyeguard for direct afocal/eyepiece-projection imaging. Fits both 1.25" and 2" focusers.