🌐EnglishEnglishDeutschEspañolFrançaisItalianoNederlandsРусскийالعربيةไทย中文日本語EntityQ1459394· pop 12· linked from 17 articlesStrehl ratioproportion of observed intensity to ideal intensity, in astronomical imagingConnectionsmicroscopeEntitydigital object identifierEntityCategoriesAstronomical imagingEngineering ratiosOptical quantities