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telescope in which the focusing is achieved by movement of double concave lens mounted in a short tube, pikksilm, milles teravustamine saavutatakse pikksilma lühikesse torusse paigaldatud kahekordse nõgusläätse liikumisega
internal focusing telescope . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/internal%20focusing%20telescope/1/eng (05.07.2026)
