"What sets Radians apart from other long-eye-relief, short-focal-length eyepieces is superb image quality. Even discerning planetary observers who customarily choose Plössl or orthoscopic designs are switching to Radians."
— Sky & Telescope Hot Product Award.
Radian Highlights
- Focal Lengths: 18mm, 14mm, 12mm, 10mm, 8mm, 6mm, 5mm, 4mm, & 3mm
- 60° AFOV with full-field sharpness on any f/# telescope
- High efficiency, tuned multi-coatings to maximize contrast
- Adjustable eyeguard for blocking ambient light, fully retractable so as not to rob eye-relief
- 20mm Eye-Relief for eyeglass wearers or Dioptrx users
- Distortion correction for day and night use
- Compact size and weight: bino viewer friendly
- All focal lengths are Parfocal with all Tele Vue 1¼" eyepieces
Here are Choices for Tele Vue Telescopes
| TV60/TV60is | TV76 | TV85 | TV101/NP101is | TV102/102iis | ||||||
|
Radian (mm) |
Mag. (x) |
True Field (°) |
Mag. (x) |
True Field (°) |
Mag. (x) |
True Field (°) |
Mag. (x) |
True Field (°) |
Mag. (x) |
True Field (°) |
| 18 | 20.0 | 2.91 | 26.7 | 2.19 | 33.3 | 1.75 | 30.0 | 1.94 | 48.9 | 1.19 |
| 14 | 25.7 | 2.29 | 34.3 | 1.72 | 42.9 | 1.38 | 38.6 | 1.53 | 62.9 | 0.94 |
| 12 | 30.0 | 2.01 | 40.0 | 1.50 | 50.0 | 1.20 | 45.0 | 1.34 | 73.3 | 0.82 |
| 10 | 36.0 | 1.67 | 48.0 | 1.25 | 60.0 | 1.00 | 54.0 | 1.11 | 88.0 | 0.68 |
| 8 | 45.0 | 1.32 | 60.0 | 0.99 | 75.0 | 0.79 | 67.5 | 0.88 | 110.0 | 0.54 |
| 6 | 60.0 | 1.00 | 80.0 | 0.75 | 100.0 | 0.60 | 90.0 | 0.67 | 146.7 | 0.41 |
| 5 | 72.0 | 0.84 | 96.0 | 0.63 | 120.0 | 0.48 | 108.0 | 0.56 | 176.0 | 0.35 |
| 4 | 90.0 | 0.67 | 120.0 | 0.50 | 150.0 | 0.40 | 135.0 | 0.45 | 220.0 | 0.27 |
| 3 | 120.0 | 0.53 | 160.0 | 0.39 | 200.0 | 0.32 | 180.0 | 0.35 | 293.3 | 0.21 |