视场计算器 — 公式
## True Field of View
**TFOV = AFOV / Magnification**
The apparent field of view (AFOV) is a property of the eyepiece design (e.g., 52° for Plossl, 68° for wide-angle, 82° for ultra-wide). Dividing by magnification gives the actual sky patch visible.
The full Moon is about 0.5° across, useful as a reference.
**TFOV = AFOV / Magnification**
The apparent field of view (AFOV) is a property of the eyepiece design (e.g., 52° for Plossl, 68° for wide-angle, 82° for ultra-wide). Dividing by magnification gives the actual sky patch visible.
The full Moon is about 0.5° across, useful as a reference.
计算示例
52° AFOV eyepiece at 48×.
- Magnification = 1200 / 25 = 48×
- TFOV = 52 / 48 = 1.083° = 65.0 arcmin
- This fits about two full Moons side by side.