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本帖最后由 zn7726 于 2013-10-17 12:32 编辑
jmms_smmj 发表于 2013-10-17 12:08 
你沒入就這麽多問題？
我覺得很好用
不是我的问题, 是别人遇到的问题, 我做功课时发现的. 简单总结一下提醒别人而已.
捉五龙也用这个头, 发现跑焦, 准备购买USB Dock.
这个镜头光学素质没问题, 你已经展现的狠好了. 网上别人报告的问题, 拿过来提一下, 不会不允许吧?
最近看到的
http://forums.whirlpool.net.au/f ... ?t=2022679&p=14
Hi folks, I wanted to add my less than fantastic experience with this lens as a caution to those considering purchasing it. It is, after all, a fair amount of money and there are no returns on photography products in this country (that I've found).
I briefly owned a Sigma 35 1.4 in Nikon mount and used it on my D600. The positives:
Ridiculously sharp wide open at close and moderate distances.
Lovely skin tones – takes fantastic people shots
Great colours and contrast
Built like a rock and beautifully finished, and rather heavy as a result
The negatives:
Autofocus was completely off when I first mounted it, more than any lens I've ever owned. It required +15 adjust to make it work at distances of a few meters or less.
Beyond a few meters, no amount of adjust was enough – massive front focus was the order of the day
At landscape distances the borders and corners are quite a lot softer than the center of the frame (using e.g. f8-f10). Not unacceptable in my book, but definitely noticeable.
In low light the AF accuracy got a lot worse, particularly under compact fluorescent bulbs. These same conditions are not an issue with my Nikon lenses.
It doesn't work at all with the AF assist lamp in my SB700. Results in erratic and random focus errors.
Live view AF was a fail. Never could get any consistent results.
None of these are anything new, and I've read reports by a number of people having similar issues. In this thread and on other sites I've also seen Canon guys having AF issues. So caveat emptor, it can be a great lens but quality still seems to be a lottery with Sigma. A lot of people are hailing this lens as the killer of all other full frame 35mm lenses. It might be when it works, but then only for some applications. Not landscape though, and not if you get one of the bad ones. |
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楼主:jmms_smmj
发表于 2013-10-17 10:04
