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12.5" f/8 CDK 卡式望遠鏡

12.5" f/8 CDK 卡式望遠鏡

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Description

12.5" f/8 CDK 卡式望遠鏡。修正 DK 卡式鏡、D= 317.5mm 。

三文治主鏡,焦平面比傳統的 DK 有更大面積的平場,更適宜現在的高解像度 CCD 攝像頭用

口徑: 12.5" =317.5mm
光學結構: CDK corrected Dall-Kirkham
特色: 三文治主鏡
材料: 平板玻璃:US$1950;Pyrex US$2450
主鏡焦比: F 6
綜合焦比: F 8
主鏡精度: Strehl ratio >=0.95
視場: 45mm
遮光率: 38%
主鏡後焦點距離: 318mm
主鏡厚度: 40mm
主鏡重量: 玻璃 ~6kg
主鏡鍍膜: 92% 半加強膜
副鏡直徑: 120mm
副鏡鍍膜: 96% 加強膜
矯正鏡鍍膜: 99.5% 寬頻膜
配件: 3" 調焦座
備註: 起貨時間 90天

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