[sai1234]

CANON 除了其 紅圈L鏡出名之外 (雖然本大並不同意,但的的確確好多人手持L鏡時所感受的優越感遠大於其實際性能及拍攝的相片), 另一出名地方必定是由 10D開始 到 1D MARKIII 遲遲未能解決的走焦問題. 在近數年內,幾乎 走焦 同 CANON 都可以寫上一個 "=".
我希望CANON 唔好再用什麼什麼天文望遠鏡等等廣告來騙人, 把資源去解決相機的最基本要求 ----- 準確的對焦.!!!!

大家有時間看看以下的 LINK 把.

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9198

[cy001]

I have looked. the quality of all phots are very good. I can't see any big problems on it. Are u a user of EOS 1D Mark III?

[twheddie]

L鏡的質素好是挕攝影界公認的事,不能騙人,用過的人大乽同意,不是個人的意見可以轉移,我用了Canon 機和鏡數十年,十分滿意,無想過轉牌子.日本天文台是著名的觀天象機構,他們用Canon鏡己說明一切.走焦問題已冇人解釋過,是指追焦,新firmware應己解決.我用過的300D,350D,400D,40D和5D都沒有走焦問題,效果很好.

[peterchan04]

每十零個 月 就 出 部 "升級 dslr 機" ...

你估 出 dc 仔 噤 容易咩...

而家 就 整單 1d mk3 "半殘機"

應該 小心 d.... 慢慢研究.... 起碼測試 3, 4 年 至 推出.

1d mk3.... 自取 滅亡....

.

[cy001]

EOS 1D Mark III is not bad as u said. Not all EOS 1D Mark III have a mirror problem. I'm understand many of user dislike Canon. But it is very difficult to misleading the user of EOS 1. They are very professional. If they feel other bands is better than Canon, I believe they will give up Canon EOS 1. Anyway, some non-canon user allways say Canon not good. It is a very good advise to Canon working hard to lead in DSLR.

[hanny]

this is many time say that people like to talk canon out focus

but i don't see that the other brand a better than canon too much

becasue before some guy was prove that little bit out focus also happen on nikon and om

if canon is really bad than i don't think it so popular until now

[zeusho]

其實是次事件，在外國相當出名 (我自己亦有留意)，dpreview亦有多次報導，最近一次於這幾天：

http://www.dpreview.com/news/0712/07121101robgaleos1dmkiii.asp

「Rob Galbraith's EOS-1D Mark III update

Rob Galbraith has posted his latest installment of the issues and fixes around the much publicized Canon EOS-1D Mark III continuous auto-focus issues. This story has been running since around June time when Rob first posted his relatively poor experience of shooting the EOS-1D Mark III in a working sports environment. Rob identified a number of issues including jumpy auto-focus and inconsistency in AI Servo sequences especially when the camera was warm while shooting in bright light. Canon has recently spoken of a fix which replaces the the AF sub-mirror assembly in the camera, there also appears to be yet another firmware update on the horizon. However it's clear from Rob's very extensive analysis (a good portion of which appears to have been carried out in conjunction with Canon) this isn't the end of the story.」


早約半年前，記得沒有錯的話，以上網站，已經有超過二百名Canon 1D Mark III的用家，聯署要求Canon正視該機走焦問題，後期Canon更多國回收Canon 1D Mark III及停止供貨，大家可以參考這裡：

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068

「Q. What are the camera's autofocus problems?

It has four, all of which are related to the camera's autofocus performance:
Under certain conditions, the EOS-1D Mark III has difficulty acquiring focus initially. In a multi-frame burst, the camera will sometimes shoot three to five frames before a moving subject comes into focus, and occasionally a moving subject will not actually snap into focus before the burst is completed.
Under certain conditions, the camera is unable to properly track a moving subject. We've shot numerous sequences of 20+ frames where no more than five or six frames are in focus, even when the AF point has been on the subject throughout.
Focus can shift slightly but constantly at times when the subject isn't moving. Under certain conditions, the subject may not actually come into focus through a sequence of frames, even though the point of focus can be seen to be shifting throughout the sequence. This is true whether the camera is set to AI Servo and focus is active throughout the sequence, or when it's set to One Shot and focus is activated between each frame.
When tracking a subject that's moving somewhat erratically, the camera is far too quick to shift focus elsewhere - to the background or, with a field sport like soccer, to a player passing through in the foreground. With the first three problems, autofocus settings changes don't make things better or worse. With this problem, Custom Function III-2, AI Servo Tracking Sensitivity, does have an impact. But regardless of how this Custom Function is set, it's not possible to make the camera's tracking sensitivity be right. There's more on this ahead in the article.」

「We've received a few emails from EOS-1D Mark III owners claiming autofocus problems. Not a lot - at a glance it looks like fewer than 20 photographers so far - but of those, most asked some variation of this US$4495 question.

While we can't answer this question for you, we can commiserate. After returning one of the bodies to Canon, website co-editor Mike Sturk sent me an email that summed up perfectly what it can be like to have and then part with an EOS-1D Mark III: "I'm glad it's gone back [to Canon,] because the files were so great I found it hard NOT to use the camera.

He had just completed several days shooting show jumping with the EOS-1D Mark III, an experience that was equal parts joy - thanks to the image quality - and frustration, because the EOS-1D Mark III's autofocus was too hit-and-miss when compared to his trusty EOS-1D Mark II.」

後期証實有更多Canon 1D Mark III的用家發現問題：

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9069

「Q. First, why is it good news that you've heard from quite a few EOS-1D Mark III shooters citing similar autofocus problems?

Because we're certain that this problem will only get Canon's full attention if they know that a sizeable number of EOS-1D Mark III customers are struggling with its autofocus. And rightly so; it would be foolhardy for Canon to devote a lot of time and energy to a problem that they're only hearing about from a tiny number of people. Canon, like any big company making popular products, needs help in determining what's a major problem - as we think the EOS-1D Mark III's autofocus is - from things that are more minor or even user error.」

「Q. Are you absolutely, positively, 100% sure that the autofocus problems are in all EOS-1D Mark III bodies?

There's no way for us to be absolutely sure of course. And statistically, the number of bodies we've tested vs the number of bodies shipped means we've looked at a pretty small portion of the EOS-1D Mark IIIs out in the world right now. But, the kind and quantity of shooting we've done, combined with a little experience with this stuff and a little common sense too, adds up to the belief here that the problem is in the design of the autofocus system vs there being a few bad EOS-1D Mark III apples around.

If we didn't think that was by far the most likely explanation, we wouldn't have published this story. And the number of photographers we've heard from now that are having the same sorts of troubles in the same types of shooting situations suggests that we're onto something.

But there are other explanations. From where we sit, they fall into the possible-but-not-probable category we wrote about before. If you own the camera or are considering getting one, you'll have to decide which explanation seems most likely to you.」

已收到官方信函 英國1D MARK III召回

http://www.pcpop.com/doc/0/241/241652.shtml

「佳能目前的的次旗艦單反EOS 1D Mark III可以說打露面的那一天起就沒踏實過，前一段又被懷疑有自動對焦方面的缺陷，而佳能官方對此一直也沒有作出任何形式的說明。不過最近英國的許多經銷商商都收到來自佳能官方的一封信函，根據文字，我們可以明確的看到佳能已經瞭解自己產品的自動對焦方面問題確實存在一定問題，但上面說只有極少數的產品存在這個現象。

佳能這次算是變相的在英國承認了自己的產品存在問題，注意只是英國，目前其他國家和地區的佳能官方依然沒有反應，如果您不在大不列顛，只能繼續等待了。」

待續

[zeusho]

此官方信件有「多國版本」，我在此只貼一張，不作重覆了。

待續

跟著回應：甚麼日本天文台之論。

[zeusho]

補充：

早期已有大量用家發現有問題：

「In the 48 hours since this article went live, we've received a mountain of email from photographers reacting to it. The good news, if you can call it that, is that many EOS-1D Mark III owners are telling us that the article described all too well the autofocus difficulties they're experiencing. We'd heard fewer than 20 complaints about the camera's autofocus before this article was published; since the story went up, that number has climbed past 200. And the email is still rolling in.」

Among the comments were questions too; a few of those questions made it clear we needed to say more on a few topics.」

最後証實有大量相機有問題 (這只是美國本土而已)：

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9072

「We're of the firm belief that the EOS-1D Mark III's autofocus problems come from something other than a body or lens that needs adjustment or parts replacement. Using just the firmware v1.1.0 testing as an example, the two EOS-1D Mark III bodies, as well as EF 300mm f/2.8L IS and EF 500mm f/4L IS lenses, were all checked and calibrated by Canon USA service technicians before they were shipped here, so that they could definitively rule out equipment miscalibration or some other malfunction as the cause of the autofocus problems we've been reporting.

For those keeping score, we've now shot with six different production-level EOS-1D Mark III bodies, with serial numbers ranging from 503xxx to 529xxx, and seen the same autofocus problems in all of them. As we've noted previously, it's possible that these bodies are all lemons, it's just not probable.」

回應twheddie：

「走焦問題已冇人解釋過,是指追焦,新firmware應己解決」

Canon向用家表示，會以firmware更新以解決問題，但經過多次firmware更新後亦不能解決，需要硬件更換：

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9128

「In the We've heard from a large and growing number of photographers today that Canon USA's customer care centre is advising EOS-1D Mark III owners who call in that a fix for the camera's AI Servo autofocus problems is approximately two weeks away, that it will involve replacing the sub-mirror (a mirror behind the main reflex mirror that passes light to the autofocus sensor module) and that customer care reps are taking down contact information from those customers who would like to be notified when the fix is available.」

出現問題的不只在於追焦，亦重時在於「One Shot」(還要嚴重)：

http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9168

「AI Servo focus stability in bright light and warm temperatures has definitely been improved. While the focus distance still shifts about too much, it does with the EOS-1D Mark II N too.

With either camera, the steadier the photographer the more stable the focus, particularly with telephoto lenses; conversely, the focus distance can fluctuate a fair bit when the lens starts to bob up and down some. So, neither camera's AI Servo focus holds as steady as it should on static objects. But, as we noted back on June 19, we've never used a camera with autofocus that is as stable as we'd like when set to continuously focus and the subject isn't moving.

But the question was about One Shot. And the best answer we can give is that while we haven't used One Shot much at all, we did one batch of tests where we shot the Phoenix runner standing still, using both the EOS-1D Mark III and EOS-1D Mark II N, in both AI Servo and One Shot modes.
For the AI Servo frames we had the cameras firing at their fastest frame rates, with the autofocus point on the runner's torso throughout. For the One Shot frames we focused on the background, then back to the runner, between each frame, taking care to steady the camera before activating the autofocus.
The AI Servo sequence shows some focus fluctuation, as expected, but the frame-to-frame focus consistency is markedly better than the comparable One Shot photos. This is true of the EOS-1D Mark II N, and true of the EOS-1D Mark III.
Make of this what you will. While we don't have any reason to doubt the results of this test (which you'll find in the downloadable sequences section), we also don't have a whack of real-world One Shot experience to accompany it.」

現時收到的消息，有用家「completed the sub-mirror repair」後問題依然…

待續

[diky]

何只1系機種，我部EOS-40D搭載EFs17-85mm 在廣角端成了近視永遠都不能對蕉去到10M，尤其用Live View放看更蒙蒙濃濃，回廠修了好多次都不盡人意,維修師父更叫我習慣這誤差吧！

[zeusho]

再補充：

http://forum.taobao.com/forum-11/show_thread----11880315-.htm

機關鎗失准 佳能1D Mark III停止供貨

相信大家還對佳能EOS-1D Mark III早前被國外媒體爆出在自動對焦系統上存在問題的新聞還有印象吧，而且佳能還專門針對可能存在的對焦問題推出了升級固件，我們IT世界網之前也曾作出相關報道，大家可以查看《1D MARK III又升級 佳能公佈新固件》，但是佳能官方始終沒有正面回應這一問題，而且似乎固件升級後，自動對焦問題還未能得到解決。

就在昨天，佳能英國公司對各經銷商發出了一份看起來像官方信函的通知，而這份信函上面明確地寫著佳能瞭解到EOS-1D Mark III自動對焦的問題是確實存在的，但只是少數產品存在這種情況。不過在這份通知中有兩點是值得深思的，第一點是「為了確保顧客的滿意度不受影響，佳能決定暫停對EOS-1D Mark III的供貨，同時我們希望能回收您手中所有的EOS-1D Mark III存貨。」，不過另一方面卻又說「對於已售出的，存在問題的產品，佳能正在尋求解決方案，佳能可以提供維修，但將不提供更換新機或回收。」

待續

[hanny]

actually canon make lose in the 1d mark 3

i don't know why the ai servo not test seriously ?

but at lease canon resposible for this

not like d200 the first release time in high iso with trouble picture in ccd
but nikon do not say any thing

becasue of this the d3 and 1ds mark 3 i will wait at lease after 1~2 month until every body say no problem than i will get them

but d3 and 1dsm3 still not is very shortage
make me still need to wait :>

[Roa]

我也用了十多年Canon，一直被走焦問題困擾(絕對並非祇是追焦攝影的問題)，作為一隻大牌子，總不能對我們這些長期用家不負責任吧，如果鏡頭生產線無問題的話，新1系Body也無需設置多個焦距微調補償，大家作為Canon用家，更應如實反映，希望Canon能有更佳的改進。

[twheddie]

美國的信件是10月,但canon己於12月2日出了新的firmware 1.1.3,相信已解決了問題, 大家講的可能已成為歷史問題.
我用Canon 機二十多年,沒有發現問題,很滿意其質素,我也有效40D和17-85is鏡,不覺有問題.
另Canon的最高級形號是價值57000元的1Ds MARKIII,不是3萬多元的1D MARKIII.
有聽過1Ds MARKIII 有走焦問問題嗎?

[kingkonghk]

朕捱2氣, $20收買走蕉機