Kostenloser Image Resolution Rechner
Berechnen Sie telescope angular resolution aus aperture unter Verwendung von Dawes und Rayleigh limits. Kostenloser astrophotography tool.
Dawes Limit
0.5800 arcsec
Dawes Limit vs Aperture Diameter
Formel
## 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.
Lösungsbeispiel
200 mm aperture telescope.
- 01Dawes limit = 116 / 200 = 0.58 arcsec
- 02Rayleigh limit = 138.4 / 200 = 0.692 arcsec
Häufig Gestellte Fragen
Does atmospheric seeing limit resolution?
Yes. At most sites, seeing limits resolution to about 1 to 3 arcseconds, regardless of aperture. Adaptive optics or space telescopes can overcome this.
What is the difference between Dawes and Rayleigh limits?
The Dawes limit is an empirical rule for equal-brightness star pairs. The Rayleigh criterion is a theoretical diffraction limit. Dawes is slightly more optimistic.
Does magnification affect resolution?
No. Magnification enlarges the image but cannot reveal detail beyond the diffraction limit. Over-magnifying just makes a blurry image bigger.