[求购] 1500左右收赤道仪及脚架 |
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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四川达州天文爱好者群:27718639
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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BADMAN:目镜的表现视场的简易计算:表现视场=57.5/焦距*视场光阑(度)
举例说明一个焦距20mm的目镜,视场光阑直径是24.5mm,它的表现视场=57.5/20*24.5=70度 |
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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<-sina_sign,2611770390,d342409d,5->
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