ดาไทสัน 0.965 นิ้ว 90 ° กระจกเซนิธ, เลนส์แก้วออปติคอลสะท้อนแสงสูง, เหมาะสำหรับกล้องโทรทรรศน์แบบหักเหแสงระดับเริ่มต้น

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