Vivitar VIV-TEL-76700, Инструкция по эксплуатации

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Maintaining Your Telescope
The mirrors and lenses arethe most important and the most easily damaged parts of your telescope. To
avoid affecting the precision and the performance of your optics, the mirrors or lens can't be casually
taken out of their mount and the lens or mirrors must be cleaned as carefully as possible.
Cleaning : When it becomes necessary to clean the lens or mirrors , you should first clean off any dust
with a suitable brush, and then drop a few drops of non-harsh cleaning fluid on a clean soft
cloth, and brush any remaining prints or dust.