是否CANON"L"鏡比較不會移焦?
我是N家的因為有想轉入C家的系統，
另外就是30D和400D的對焦系統
一樣嗎?
謝謝!
)buena009 wrote:
2.一樣有9個對焦點, 但上次在哪本日文雜誌裡看到一篇文章說, 2者其實是不一樣的;
並不是把30D的對焦系統整個下放到400D. (有其他網友知道原理嗎?我也想了解明確一點...)
(恕刪)
依據Canon官方說法: (400D使用與30D相同的對焦模組)
The Digital Rebel XTi has a 9-point, high-precision autofocus unit that it shares with the EOS 30D. The central sensor of the AF unit enhances precision with f/2.8 or faster lenses, a professional feature exclusive to the XTi in its category.
請參閱: Canon 400D 白皮書
我手上有30D/400D, 之前也有一台350D拍了兩萬多張(已二手售出). 依我自己使用心得是400D對焦準度與30D在伯仲之間, 有些時後400D比30D還準!
sambad wrote:
依據Canon官...(恕刪)
你所提供的連結是CCD清潔刷公司所贊助攝影網站上所提供的PDF檔.....
在Canon Global全球網站"Bebit"上
對於400D 9點 AF的文字是這樣的
9-point AF
High-speed, selectable AF for flexible composition
at apertures up to f/2.8
For smooth operation and flexibility needed for creative expression, the EOS 400D DIGITAL has a 9-point AF sensor that enables fast and high-precision focus detection plus enlarged subject coverage. Convenient cross keys provide fast and easy AF point selection. For more accurate shooting and additional flexibility, focusing points are in a diamond-shaped layout with a central AF point offering cross-type focusing, regardless of lens brightness. In addition, higher precision focusing is possible when using lenses brighter than f/2.8. Such variable focusing enables quick adjustment for a variety of compositions and shooting situations.
http://web.canon.jp/Imaging/eosdigital3/shooting.html#af
上文並沒有提到30D跟400D使用相同的對焦模組
而在"攝影家手札特輯"所出的"Canon EOS 400D完全解析"一書中,卻明白地寫出
".....在400D發售後,身負中階機種的30D變得有些尷尬. 畫素雖然只有820萬,
不過較高等級的AF系統與點測光可能較符合專業使用者的期待....."
而且30D是Canon自5D以下(含5D), 高速連拍與AI SERVO速度最快的機種, 可達1秒5張.
(400D是1秒3張).......
目前手邊的資料跟來自朋友的使用經驗上, 好像都無法證明它們是同一套的對焦系統,
還是有更多其他的網友能解惑呢?
Lost in Lens
http://blog.yam.com/buena009
FB/ivan.liu.39
buena009 wrote:
這是那裡的Canon...(恕刪)
我提供的白皮書是Canon在公佈400D時發佈給各大網站的官方文件, 你可以去google一下, 同一份白皮書在許多大型網站中都還有.
另, 依據國外知名網站:
Imaging resource
"9-point autofocus unit with high-precision f/2.8 support (same as on EOS-30D) "
dpreview
"One criticism of the EOS 300D/350D was auto-focus, Canon has decided to bite the bullet and simply installed the considerably better nine point AF sensor from the EOS 30D in the EOS 400D. This affords both faster, more accurate focusing as well as center point AF which is compatible with F2.8 lenses. "
以上均指出400D採用的是30D對焦模組, 我自己使用也同意它的對焦準度某些場合比30D好, 但大體上還在伯仲之間. 另, 我手上30D是第一批的公司貨, 花了四萬多買的, 沒事我才懶得吐槽自己手上的機器. 就事論事, 30D的對焦演算法應該還有改進空間, 希望能有新版firmware釋出. 而400D的對焦準確率與30D在伯仲之間, 且重量較輕巧, 以致我30D比400D還少帶出門.
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