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davidll1974
註冊: 2009-08-30
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 auto focus problem Post time: 8 月 30 日 |
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我近來用我部D90+Sigma lens 在太陽底下拍攝,試過幾次Autofocus 有問題,鏡頭一味旋轉都fo 不到.
拆卸鏡頭出來再裝上可能會好返一段時間,但過一會又出現同樣問題.
出現問題時通常在戶外大熱天時....我兩個Sigma鏡頭都是一樣.
我送去原廠check, 他５分鐘之後出來同我講沒事....重問我係米鏡頭問題....
有師兄有試過馬?
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manpo79
註冊: 2007-04-17
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| Re: auto focus problem Post time: 8 月 30 日 |
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你用咩鏡?
如果係長焦有可能會,一下近一下遠就唔識對焦
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mffkalok
註冊: 2007-12-17
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| Re: auto focus problem Post time: 8 月 30 日 |
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其實太陽底下(大反差), 對唔到焦都係正常情況黎既...
即係等於我叫你望住太陽個方向, 睇唔睇到30樓上面有冇開窗咁之嘛....
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davidll1974
註冊: 2009-08-30
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| Re: auto focus problem Post time: 8 月 30 日 |
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但係前後不到５秒,focus 同一個地點,一開始得,跟住五得.拆鏡裝返又得返又點解釋le?
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manpo79
註冊: 2007-04-17
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| Re: auto focus problem Post time: 8 月 31 日 |
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你支係咩鏡黎?幾多mm ?
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davidll1974
註冊: 2009-08-30
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| Re: auto focus problem Post time: 8 月 31 日 |
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Sigma 18-200 HSM
Sigma 50mm 1.4
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德國佬
註冊: 2009-05-18
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| Re: auto focus problem Post time: 8 月 31 日 |
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同主體相距多遠呢? 是否近過最近對焦距離?
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snoopybee
註冊: 2002-12-22
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| Re: auto focus problem Post time: 8 月 31 日 |
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後生仔, 唔好鑽牛角尖, 聽人講下野先啦.
mffkalok 已經講左, 你試左未? 唔好一味問問問.
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fwan67
註冊: 2008-02-17
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| Re: auto focus problem Post time: 8 月 31 日 |
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I also use Sigma 50mm f/1.4 with D40 and it can't focus well if
1. The object is moving too fast, I still couldn't find the rule out.
2. The object is too close, of course, it can't focus well. It require at least 50cm between object and lens.
3. The object is too dark, even 1.4 is not large enough, then, it is very dim.
4. The object is too thin, e.g. a string.
5. The object is transparent.
6. The object is too bright, e.g. Sun.
Basically, I always mixed with Manual focus to overcome those problem.
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davidll1974
註冊: 2009-08-30
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| Re: auto focus problem Post time: 9 月 1 日 |
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已經試哦。。。
同主體相距大概2-3米
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