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cross section of a refracting telescope click to hear : cross section of a refracting telescope

Linsenfernrohr im Querschnitt click to hear : Linsenfernrohr im Querschnitt

cross section of a refracting telescope image

eyepiece click to hear : eyepiece

Okular click to hear : Okular

main tube click to hear : main tube

Tubus click to hear : Tubus

objective lens click to hear : objective lens

Objektiv click to hear : Objektiv





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