Largest Optical Telescopes in the World 2026
About This Dataset
Largest Optical Telescopes in the World 2026
Reflecting telescopes ranked by effective aperture in metres - the width of the light-collecting mirror, which sets how faint an object the instrument can see. Some entries combine several mirrors working together, so their effective aperture is larger than any single mirror they carry.
Analysis
Large Binocular Telescope (LBT) has the largest effective aperture at 11.9 m, ahead of Gran Telescopio Canarias (GTC) on 10.4 m. 1 of the 13 reaches its figure by combining separate mirrors rather than with one piece of glass. Apertures on this chart run from 8.1 m to 11.9 m, a spread of just 3.8 m - collecting area rises with the square of aperture, so that gap is larger than it looks. 8 of them list the United States among their sponsors.
Key Findings
🏆
Large Binocular Telescope (LBT) leads in Effective Aperture (m) with 11.90 in 2026.
📊
Average Effective Aperture (m) in 2026: 9 · median: 8.
↔️
Gap in 2026: Large Binocular Telescope (LBT) is 1.5× larger than Gemini South.
Data Insights
Numbers, trends & sources behind this chart
Methodology & source
- Data source
- Wikipedia, List of largest optical reflecting telescopes
- Coverage
- 13 entities · 2026 · 13 observations
- Measure
- Effective Aperture (m)
- Last updated
- 7 September 2026
- Compiled by
- The ANYSTAT team, from the source above
How the figures are calculated
- Values are shown as reported by the source. Nothing is rescaled, rebased or converted — the only changes are thousand separators and decimals shown to two places.
- Entities are ranked highest-first on their value in 2026.
Data Sources & References
All external sources cited in this dataset
Related Charts
More statistics on similar topics