Eyepiece · 2000–2009
Celestron Ultima 18mm (Plossl)
Key specifications
| Focal length | 18 mm |
|---|---|
| Apparent FOV | 52 ° |
| Barrel size | 1.25" |
All specifications
| Elements | 5 |
|---|
About
18mm classic Ultima eyepiece (discontinued): a 5-element (Masuyama-type) design with a 52-degree apparent field and better edge correction than a standard 4-element Plossl, multi-coated, with a 1.25" barrel.