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center   討論區主頁 » Four Thirds System and Olympus SLR » E-3 焦點前移無發表權

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sinoperson
發表時間: 2008-05-14 07:56
Not too shy to talk
註冊日: 2005-01-30
來自: 香港
發表數: 29
[42982] E-3 焦點前移
原來外國已有一鑼鑼 E-3 "焦點前移" 的案例, 其中一個....


Source: http://forums.dpreview.com/forums/readflat.asp?forum=1022&thread=27492533&page=2

olyflyer




I had similar focus problems with 80-90% front or back focus. However, I detected the problem the same day I received the camera and after a few days of testing I sent a mail to Olympus Sweden with some samples explaining the situation. I immediately received a reply saying to pack everything back in the box and return the body for exchange as it was immediately classed as a DOA. The replacement body works fine.
I would advise you to take a series of test images, but you have to take the test images in a more controlled way. Don't recompose, if possible use tripod. Make sure no hair is hanging down on the eyes. Take a few test shots of slanting flat images as well. Use single spot AF, S-AF mode, sensitivity Small, Shutter priority OFF. If possible use tripod. IS or no IS should make no difference, the camera must work with and without. When you are done contact Olympus, but you must make sure you excluded the user error part, however painful and irritating that may sound, the two images you included here does not exlude the possibility of user error. Don't use LV, IMO it is not possible to hold the camera stable enough with the LV, especially if you focus and recompose, which you did here. I think that is a major problem with these two images. Use the VF or a tropod. Holding the camera traditionally gives more stability. IMO LV is for tripod works and emergency only.

Here are some of my test images, the red crossing lines mark the center of my focusing point. I used the ED50/2 macro at F/2.0. The lens worked previously very well on my E-500 for over a year, so I knew the lens or the filter on it was not the problem.
The first image is where I originally noted my problems.


機主發覺他的 E-3 對焦不準








Here is a 100% crop of the area where I focused.

100% 原圖



And here is what the camera focused on, the shoulder nearest the camera. 真正焦點前移到肩膀




My slanted ruler test images showed the same FF problem. The ruler was about 1 meter from the camera, slanted in about 45 degrees.
放了一把尺子於E-3前約一米拍了一張, 斜45度, 也顯示是焦點前移,



The 100% crop shows about 1 cm FF.

100% 原圖顯示約 1cm 焦點前移


All these were repeatable 80-90% of the time.


The images out of my second E-3 body with the same lens definitely look different in similar situations, as you can see in these 100% crop of the center area.

後OM換了一部E-3 給他後用上同一支鏡頭, 情況已不同

100% 原圖




Even slanted images work well.




A 100% crop of the remore. 100% 原圖




And the final, ruler image, a 100% crop of the focus area shows clearly no more problem.
The relation now is more like the opposite, about 80-90% (possibly even more)good and accurate focus. The camera still occasionally decides that the focus is right when the focus is actually totally wrong, but that only happens a very few times, as opposed to before, when accurate focus was a random occasion only. Of course, even before I could see most of the times when the camera missed focus alredy in the VF, so I don't understand how you can not see that.

I don't use the LV often, but I suppose it should be even more clearly visible when looking through the LV that an image is OOF. I think one pronlem with LV is that it is not possible to focus lock using the LV, AFAIK. Now that I took a pause from writing (I actually started to write this post about an hour ago) I realize you use the LV and recompose. Surly that can not work because then the camera will refocus when you finally take the image and press the shutter release. Isn't it the case? Anyway, as I said I don't use LV, so I am not an expert on it...

I suggest you take some similar images, if they turn out like my first series with the problem most of the time than you sould write a proper mail to Olympus and explain, include the sample images and call them next morning to discuss personally with the customer relations or the service manager. If your camera is still almost new, they should rerplace it, especially since they already had a chance to repair it, which they failed to do.

Good luck.
jerloong
發表時間: 2008-05-14 08:35
版主
註冊日: 2004-10-18
來自:
發表數: 2768
[42988] Re: E-3 焦點前移
這個問題在E-3發售不久就曾討論過了
如果有相當程度偏差 那應該是該機個案
如果有對焦點千後些微偏差 尤其是稍微前移居多
那是設計理念問題
sinoperson
發表時間: 2008-05-14 10:10
Not too shy to talk
註冊日: 2005-01-30
來自: 香港
發表數: 29
[42997] Re: E-3 焦點前移
E-3都出了差不多半年了, 這種個案仍有不少在外國討論中, 對焦的設計理念不就是準確嗎? 對焦就是 1+1 = 2的事情! 相信沒有人會接受出現不是2的"設計理念"?! 包括 1.9 或 2.1 的 "些微偏差"!!!
jerloong
發表時間: 2008-05-14 12:35
版主
註冊日: 2004-10-18
來自:
發表數: 2768
[43001] Re: E-3 焦點前移
當然E-3硬體韌體不是我設計的 小弟也無能去改變這一切
很多人跟Olympus原廠反映 不過或許每個人意見不見相同 韌體修改無法解決個別問題

不過小弟想去嘗試了解E-3設計原理概念
也一直認為E-3需要因個人習慣去微調選單設定
還是建議參考以下網頁
http://photofan.jp/camera/html/modules/newbb/viewtopic.php?topic_id=4639&forum=2

小弟認為E-3觀景窗所見11點對焦框 每個 '+' 實際上是"+" 即使您選單設定small 還是比E-1對焦點大

如果設定單點對焦 例如中間那一點
對焦測定是個連續斜面 那相機會選定中間對焦點"+" 與被攝物體最近合焦區域 而不是很多人認定"+"的正中心那一點點
ADI
發表時間: 2008-05-14 17:36
攝政王(特權份子)
註冊日: 2004-11-20
來自: 豬寮
發表數: 6914
[43009] Re: E-3 焦點前移


幸好!~..................


OLYMPUS除了色彩渾厚漂亮之外
4/3片幅受限實在太大了

真是不知道要說什麼才好!~
collective
發表時間: 2008-05-14 18:05
版主
註冊日: 2004-10-18
來自: 柏格方塊
發表數: 12925
[43011] Re: E-3 焦點前移
引文:

ADI 寫道:


幸好!~..................


OLYMPUS除了色彩渾厚漂亮之外
4/3片幅受限實在太大了

真是不知道要說什麼才好!~

請問ADI兄,幸好啥呀
您說"4/3片幅受限實在太大了",不知道您是不是認為因為片幅小,所以相對來說對焦點太大?
不過小弟曾經親耳聽OLYMPUS原廠的人說過,E-3的十字對焦點是故意做大(比方框還大),試圖將相臨的對焦點給連接起來,要儘量減少畫面中對焦無感應的區域.
jerloong
發表時間: 2008-05-14 18:26
版主
註冊日: 2004-10-18
來自:
發表數: 2768
[43014] Re: E-3 焦點前移
原本樓主提供分享的討論中
前後照片並非同一構圖條件下拍攝 否則應該能有更好討論空間

第一張圖中心焦點應該沒合焦

依小弟認知(小弟不才之想 所以別當真)
可能或許假設原先的E-3設計如果在這樣條件下 會去找其他焦點可合焦者取代之 但這樣往往會前移
也許後來經反映 聽說更新韌體有改變合焦流程
文包
發表時間: 2008-05-15 01:56
版主
註冊日: 2005-01-05
來自: 綠葉數位影像
發表數: 1272
[43027] Re: E-3 焦點前移
引文:

collective 寫道:

請問ADI兄,幸好啥呀
您說"4/3片幅受限實在太大了",不知道您是不是認為因為片幅小,所以相對來說對焦點太大?
不過小弟曾經親耳聽OLYMPUS原廠的人說過,E-3的十字對焦點是故意做大(比方框還大),試圖將相臨的對焦點給連接起來,要儘量減少畫面中對焦無感應的區域.


對於sensor感應範圍比對焦顯示框大的現象
各廠似乎都有類似的狀況.
不過官方的人自己也這麼說. 這算是第一次聽聞
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