[icekinhk]

未玩過DSLR, 但聞說C記由300D開始就有走焦問題(FF除外), 到底係咩一回事? 情況有幾嚴重? 係機身定係鏡頭問題, or both? 遇到機會率高唔高? 係咪只有用大光圈既情況先明顯? 如果真係有走焦問題, 係次次都有, 定係間唔中一次? 有無話咩型號咩鏡頭會經常出現走無情況? 又有咩解決方法?

因為我聽過有d 師兄提及過c記走焦既問題, 甚至話買鏡頭要帶埋notebook去逐支試, 逐支換....所以好想知道係咩一回事, 希望各位單反用家(尤其係前c記 / c記用家)可以分享一下自己既經驗, thanks !

[JSmith]

我只可以咁講，有人實牙實齒話Canon 單反走焦嚴重，亦有人逝神劈願話冇事。在網上可以search到好多這類話題。驚....咪唔好買law

PS 朋友兩部350D、一部20D冇事
我一部5D冇事，自己對錯焦就時常發生，嚴重過走焦。

[icekinhk]

我認真想買一部入門單反, 亦都認真地想了解人地話c記走焦既情況, 或多或少對我既選擇會有幫助, 雖然目標買c記既機會唔大, 但唔係無。
但聽過既多數都係非c記用家講(以前有無用過就唔知), 所以先一問。

[win3t]

我用canon反八百張走焦約三張.
但每個人情況唔同.有人常對錯蕉.又有人好彩買到走蕉貨.我都睇過一些網上canon走蕉相.好驚嚇.搞到我都驚驚地

答唔到你.係canon器材問題.定係係人的問題

呢個話題再問落去都得唔到真正答案...... 不如去問米canon走蕉勁唔勁

如果問米話~~canon一定唔會走蕉~可能請到個canon粉絲上泥
所以信唔信都係由得你

[kingkonghk]

用1.8/1.4好易發生d咁事, 我試過o係nikon同km都發生過同類事件, 只要光圈收到2.2或更細就輕易解決, 又或者訓練下自己技術亦得, 不過時間長d, 講時講, 85/1.8仲易走焦

[eedbt]

係喎,個焦唔係個臉度,跌左落個心口度

[eedbt]

咁好大可能係景深淺,只有一點中焦,
咪同影微距唔中焦相類似問題,
景深深就算唔中焦都唔會朦(好容易吾以為中焦)

[bb1032003]

Agreed with Kingkonghk, I have a 300D alright with kit lens, Sigma 10-20, 50 2.5 compact Macro and Sigma 70-300.

But I brought the 50 1.8 II three weeks ago out-fo appeared. Sometimes at 1.8 sometimes at others not consistent.

300D was complained for out-fo when it was sold 3 years ago but most of the explaination is the AI focus will be activiate automatically if you move the camera too fast so that the carmena 'think' you are tracking focus of a moving object. I agreed with this as my camera seems ok before I brought the 1.8 II.

Conclusion, not serious with small aperture but may have problem with large apertrue eg 2.8 or bigger only my experience with my 300D.

[kingkonghk]

set好腳架影幾張間尺, 就知係唔係10張有8張走焦啦(可能中焦o個2張先係走焦都唔定)

[tam_dominic]

愚見估測 :

Can0n 步進馬達(控制logic) 的 步寬過大
以達快對焦效果
寧可準確度低了

F2.8, F4 尚可,
F2.0, F1.8 則 易見其弊.

eg. 同一鏡頭 , 同用 F1.8

5.8 feet, 6.2 feet, 6.6 feet OK
6.0 feet, 6.4 feet, 6.8 feet not OK
每 0.4 feet 中焦一次

In Nikon, Pantex, Olympus, Sony etc :
5.9 feet, 6.0 feet, 6.1 feet, 6.2 feet, 6.3 feet OK
5.95 feet, 6.01 feet, 6.1 feet, 6.15 feet, 6.2 feet not OK
每 0.1 feet 中焦一次

Therefore, even I set tripod to test it, sometimes ok but sometimes not ok

Just a wild guess.
Can0n fans don't flame me :^-)
My Can0n 50mm F1.8 suffer too.

Happy shooting !

[kingkonghk]

tam_dominic

如果真係一格一格管住, 即係唯有用mf囉?

[kingkonghk]

>>只 可 ＜快 而 不 準＞ or ＜準 而 不 快＞

威而鋼呢?

[eedbt]

咁咪即係支鏡 stepping motor or gear ratio 唔夠細緻及精確

[eedbt]

咁咪即係支鏡 stepping motor or gear ratio 唔夠細緻及精確
or
body 比出黎個 control single 唔夠細緻及精確
唔知用幾多bit control ?

[kingkonghk]

冇理由咁雞架