Sony 50mm F1.4 retest

After reading the mixed result and opinions on Sony 50mm F1.4 at large aperture, and learning the method to self adjust the Sony DSLR camera body sensor focus point, I performed a retest of the len and found out the focus was rather erractic, ranged from front focus of 2cm to back focus of 7cm. That explained why the images were blurred most of the time at large aperture.
Although my copy was a new stock with Sony sealed box purchased just 1-2 months ago, I cleaned the contact metal on the len body. It worked and gave a more consistent result of back focus around 3cm.
I then performed testing on other lens and also found similar result. This 3 cm of back focus may be beneficial most of the time as the focus drops on the front part of the object and helps to give more clarity to the body of the object.
However, the depth of view for 50mm F1.4 is only around 1-2cm on close distant, and the result may be disastrous.
After adjusting the body to around 0.5cm back focus, I would say the result even with F1.4 is dramatic.
My next purchase is definitely a Sony with inbody len focus adjustment.

[ 本帖最後由 AAA1 於 2008-12-13 14:38 編輯 ]

原帖由 AAA1 於 2008-12-13 14:38 發表
After reading the mixed result and opinions on Sony 50mm F1.4 at large aperture, and learning the method to self adjust the Sony DSLR camera body sensor focus point, I performed a retest of the len an ...

上a900既話,記得放埋支a001,入70-200G

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A900好正..!!
但係配2470真係有少少重

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Test image at F1.4
ISO 100, A350, JPEG Fine, AWB


[ 本帖最後由 AAA1 於 2008-12-14 20:20 編輯 ]
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回覆 4# 的帖子

Around 100% crop

[ 本帖最後由 AAA1 於 2008-12-14 20:15 編輯 ]
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seems all out focus

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This is the best the len at F1.4 can resolve with A350 without a tripod.
I have reviewed some flash shot and the result is similar.
An example from Tamron 70-200 F2.8 at F3.5 around 100% crop, ISO 100, JPEG fine

[ 本帖最後由 AAA1 於 2008-12-14 20:31 編輯 ]
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其實...除左第一張我影既話或者會用到F1.4之外
第二同第三張,就算你俾支F1.2既鏡我,我都會收到F4或更細黎影咯
點解?呢個係一個好基本既原則黎....

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提示: 作者被禁止或刪除 內容自動屏蔽

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原帖由 Midnighteye 於 2008-12-15 00:11 發表
I recommend you should read this article

不要做Pixel Peeping

it is from 給新手的幾點建言

http://blog.dcview.com.tw/article.php?a=Um8DZAJlAT4%3D


呢篇野,其實最好另外開一個post,頂置!

[ 本帖最後由 ahshing 於 2008-12-15 02:43 編輯 ]

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