反射望遠鏡のミラー洗浄 Cleaning the reflector of telescope
最近、天候が悪いので、2年ぶりに反射望遠鏡の反射鏡を洗浄しました。 ホコリがたくさん付着していて反省。 The weather has been bad recently, so I cleaned the reflector of my telescope for the first time in two years. There was a lot of dust on it.
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