Sky science
Diffraction Limit
Direct answer
Diffraction Limit: The Diffraction Limit is the finest ideal angular detail possible for an aperture at a given wavelength.
It is the wave-optics floor for image resolution.
$0 today, then $12/month after 7 days. Cancel anytime.
At a glance
- Found in
- Astronomy & Skywatching
- Related
- Angular Resolution, Resolving Power, Rayleigh Criterion, Telescope Aperture
It is the wave-optics floor for image resolution.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
What does your own chart say about you?
Choose love, work or purpose. Your reading is written from your chart. Your reading uses your own birth details.
Walk through Alex’s whole example first
The Road of AgesSee the turning points of your whole life, from your birth date
See your road's shape
Prefer to explore first?
The Road of AgesThe turning points of your whole life, from your own chart
Walk my road
Free, by email
Your daily Almanac letter
One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
The story behind Diffraction Limit
Wave optics replaced purely ray-based expectations of perfect imaging.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Diffraction Limit matters
Diffraction Limit explains why larger apertures and shorter wavelengths can show finer detail.
Diffraction Limit in practice: an example
Doubling aperture halves the characteristic diffraction angle at one wavelength.
Where readings of Diffraction Limit go wrong
A diffraction-limited specification does not guarantee good contrast or sampling.
Sources and editorial method
Research references used for this entry include:
- European Southern Observatory: Technology for Telescopes - Observatory reference for aperture, angular resolution, atmospheric seeing, mirrors, and telescope technology.
- NASA Science: Universe Glossary - NASA definitions for common stellar, galactic, orbital, and high-energy astronomy terms.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
See how aperture limits detail
A definition tells you what it is; your own birth chart tells you what it means for you. The Oracle casts your real chart and answers for your love, your work, and your year ahead, in conversation. It opens with the 7-day Seeker trial.
Speak with the OracleRelated terms
More in Astronomy & Skywatching
- Great Circle
- Longitude of Ascending Node
- Orbital Resonance
- Radial Velocity
- Solar Chromosphere
- Annual Aberration
- Aurora
From the reference page to your own chart
Every word here
is in your own chart.
- A personal reading about love, work or purpose, written from your chart
- A practical next step to consider
- It opens with 7 days free, with the AI Oracle and daily guidance
$0 today, then $12/month after 7 days. Cancel anytime.
Common questions
What is the Diffraction Limit?
The Diffraction Limit is the finest ideal angular detail possible for an aperture at a given wavelength.
What do people get wrong about the Diffraction Limit?
A diffraction-limited specification does not guarantee good contrast or sampling.
Free, by email
The Almanac, in your inbox at 7
One short letter at 7 each morning: the day’s theme read for your own chart, and one thing to do with it.
