[Sodobo]

請問各位師兄, 你地用此機是否會對焦的問題. 小弟用時, 用中央對焦也好, 9點對焦也好. 都不是成日可以對焦準確. 成功率很低. 請問有何良方改進. 多謝幫忙!

[rstlam]

對焦位是否一片純色？ 有冇去對比大的地方試過？

[Sodobo]

影人物, 對住身體, 或者臉部. 但出來的效果對焦不是很準確. ps ~ 我係用M mode去影的

[freeclouds]

你用那支鏡?
我用50mm f1.8時也會有對不準的情況
但用18-55mm又沒有這情況

[Sodobo]

我係用18-55mm鏡. 那是否屈光度校錯了. 會是這個原因嗎?

[freeclouds]

我試過用1點對焦的話比較準
主要是用人臉來做測試
你試試改成一點會否比較好

[Sodobo]

問題還是沒解決. 此方法我也試過, 不是很得. 一點和9點都有同樣情況. 是否我弄錯了什麼???

[rstlam]

支鏡有冇走焦？ 試下斜斜地影把間尺

[Sodobo]

能否再解說多些給我, 新手問題. 不是很明白. "鎖你"

[jackywong6288]

可能係光圈問題，我以前都試過咁，試下將光圈較細, eg: f5.6-f8，
係度分享下我的經驗，我一般用AV mode 影，當我用18-55is 時, 中間點對焦，我會用 f3.5, 如果用左邊點或右邊點對焦時，我會用 f5.6 或以上，當我用最右或最左點對焦時，我會用 f8 或以上, 如果用50/1.8, 就算中間點對焦我都由 f2.4~f3.5 開始，我吾會用 f1.8, 希望幫到你，

我都係新手，有錯請 c hing 們更正.......

[ks chung]

哪D就是450D同50D的分別La!!! 入門就是入門! 你估C記收多D$同D C-hing要比多D$, 是猪仔. 當年用部350D唔夠3個月就放了, 轉部20D. 一按快門就知唔同. 唔信我講不重要, 可以上Canon show room玩吓部50D. 不要刻意對焦, 直按快門落去, 張相一樣sharp!!!

[V.Chan]

走焦係全部Canon鏡本身原生設計問題,同它的機身無關.

[bb1032003]

The aperture you select will not have effect on the body's focusing ability only the lens max. aperture will affect the focusing function.

The sensitivity of the focusing sensor will only be affected by the max. aperture of the lens that you use is not what aperture that you selected. The aperture blades are always open to the max. unless two siturations,

1) what you press the shutter the aperture blades will move to the setting of your aperture selected eg. you lens is a constant f2.8 lens and you select the f4 and press the shutter then the aperture blades will close a bit so that the lens will use the f4 aperture to take you photo.

2) you press the depth of field preview botton and you select the aperture smaller than your lens max aperture and you can test on your lens and body. You can see the aperture blade move and close a bit through the front of the lens and your view finder will be a bit darker depends on how small your selected aperture is. Try the smallest aperture on your lens and you will find the differences.

[newbass]

You said you use M mode, what shutter speed you set?

[cmywonghk]

I faced the same problem when I bought my 450D last year. Cannot make a shape pic with Auto focus (no matter it was "one" point or "9" points focus) even though the signal given by the camera claimed that the pic was focused.

I asked Cannon to check my camera in CS and asked them to tune my lens with my 450D again. Sharp pics come back.

Maybe you can change from AF to manual focus also.

Try this to see if it improve your situation.

Hope this can help.