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HMYang
註冊: 2005-07-01
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 TC-14E II, TC-17E II, TC-20E II. Which one is better? Post time: 10 月 23 日 |
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Dear all brothers, I am using 70-200 mm Nikon lens. Please advise which teleconvertor is better for bird catching. I heard that TC-20E II would dramatically reduce the photo quality. Please kindly advise.
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老叟
註冊: 2003-04-22
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| Re: TC-14E II, TC-17E II, TC-20E II. Which one is better? Post time: 10 月 23 日 |
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TC-14 啦!!
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HMYang
註冊: 2005-07-01
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| Re: TC-14E II, TC-17E II, TC-20E II. Which one is better? Post time: 10 月 23 日 |
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Whats wrong with TC-20E II? The manual said it would only cost two aperture value step down. That means adjusted from 2.8 to 3.5. Right? Is there anything I am missing? Thanks all brothers advice.
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Philippe
註冊: 2003-06-01
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| Re: TC-14E II, TC-17E II, TC-20E II. Which one is better? Post time: 10 月 24 日 |
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兩級快門係2.8變5.6,唔係3.5
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kenkong
註冊: 2005-05-31
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| TC-14E II, TC-17E II, TC-20E II. Which one is better? Post time: 10 月 24 日 |
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HMYang兄，
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每一級光圈在數字上的關系是乘1.414（2的平方根）: f2 - f2.8 - f4 - f5.6 - f8... 。 f3.5 與 f2.8相差只有約半級光圈。
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當你用了增距鏡而導致光圈細了兩級，你支鏡會很有可能因光圈太細而不能自動對焦。假如你支鏡頭原來是f2.8，光圈細了兩級是f5.6便仍可自動對焦；但如你支鏡見f4，光圈細了兩級是f8便不能自動對焦了，詳情可查看nikon鏡頭的規格表。
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