图像分辨率计算器 — 公式
Telescope Image Resolution
The resolving power of a telescope is limited by diffraction at the aperture.
Dawes Limit
theta = 116 / D
where D is in mm. This empirical limit gives the smallest angular separation at which two equal stars can be distinguished.
Rayleigh Criterion
theta = 1.22 * lambda / D
At 550 nm this is 138.4 / D arcseconds.
计算示例
200 mm aperture telescope.
- Dawes limit = 116 / 200 = 0.58 arcsec
- Rayleigh limit = 138.4 / 200 = 0.692 arcsec