F1.4的镜头

压力山大

这么着能省不少银子啊。。。

过心

看了不知道，用了才知道！！！！

无过

这么说大家全部把什么金圈，红圈都出了，直接都换1.8

_44

我用f 0.95 和 f 1.0   我只知道他们焦外比1.8好看

丑得拖网速

就第二个链接那个帖子，有小女孩那个图，从1.2开始，虚化的效果是有变化的，只所以很多地方不明显，是因为，我举个例子，比如你对一个20像素的触点进行高斯模糊，200和250出来的效果是一样的，是因为很模糊了，我们肉眼不容易辨别。

丑得拖网速

光圈加一档，但是进光量增加不了一档，这个我觉得是有可能的，我也不是很懂这些理论，但我大概知道这里有一个增益递减的问题，就好比1秒以上的曝光和千分之一秒以下的曝光是要翻倍以后才能获得正确的曝光值，所以为了获得相应的曝光值，相机内部自动提高iso，我觉得可以理解，但光圈变化所导致的景深变化，我觉得应该是存在的。

rexs

那啥。。。1.8焦外成像跟⒈2很不一样啦。。
试用过⒈2的觉得色彩比较鲜艳一点，也感觉比较锐。。。
刚打算入手二只红圈定焦。。。毕竟配合机身防滴防尘还是比较安心啊

Eyeport

F1.2 and F1.8 are just different....You can use Life View to tell the difference  :)

Eyeport

automatic hidden iso compensation. so they say, of course.
铁牛 发表于 2011-6-20 16:33

i doubt if they are that intelligent ; )
at f1.2 it just gives such a nice buttery background that couldnt have been from f1.8
besides...there's noticable IQ difference when you compare an 85L f1.2 and f1.8

Eyeport

DxO test result say they are exactly that intelligent.

bokeh quality is dependent on quality of glass and sharp of Diaphragms, not solely dependent on aperture.

contrast and sharpness are not is ...
铁牛 发表于 2011-6-20 17:53

unfortunately when you try to offer a piece of equipment buying advice you can't isolate your field of discussion - bokeh, sharpness, contrast all come as a package. you don't get to "assemble" your gears.

if you do the numbers you don't get much Stop Advantage anyway...1.8/1.4 =1.29, 1.4/1.2=1.17....we so can't expect much other than prepared to pay a lot more ; )

stop advantage should be the last thing to worry about i reckon...

i-Dear

check out this video review on Nikon 50mm f/1.8G vs f/1.4G. They listed the different between F1.4 and F1.8

Eyeport

Ironbull I think ur responses above already pointed out one of the reasons why some Ppl prefer lenses with larger aperture :P

I think your info here won't serve much use for people who wanna buy equipment bcos It's not an important factor to consider then

丑得拖网速

这个帖最后很有可能到最后会变成一个伦理帖，纵观历史便知。

yellowS15

f stop calculation:

one stop slower  = current f number x  Square Root  2  (i.e.   X 1.44)    :)

开源大帝

1.4 和 1.8 时暴光度有变是真的，我的机子在开到 f1.4 时要 EV -1/3 才能得到和 f1.8 EV0 同样的暴光度，估计是机身 ISO 过度补偿了

虚化不一样，道理也很简单，全开时候光圈是圆行，那怕收一点也就变成多变形，焦外肯定不一样。

Eyeport

Some people buy expensive gear because it is trendy, some people buy L for USM and weather seal, these people have no reason to look at this thread, right?

But we also have some people want more ba ...
铁牛 发表于 2011-6-20 20:35

if you always want the best value for money gears then just stick to a 50 1.8 ^^
i think you will take better photos 6 month down the road forcing urself learning composition with a prime

Eyeport

50 F1.8 may be good value but it dosnt do a good many things i wanted to do, for example fast focus, or IS, or go wider.

that is why " I was looking at 50 F1.4, sigma 30 F1.4, and 28 F1.8 before  ...
铁牛 发表于 2011-6-23 16:56

what do you mainly shoot for?

PLA1987

我是回来围观的。。。。。

开源大帝

同时用 50 1.8 和 Sigma 30 1.4 的路过，50 在半幅机上确实太长了，只能拍个半身像。在室内用常常退到无路可退。30mm 就广的多，用起来非常方便。我每次用 50 1.8 都用的没地方退然后又换回了 30 1.4