q***q
发帖数: 3356 | 1 我觉得那一段是加了distortion的。光flanger可能还distort不了。 |
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l*****s
发帖数: 1754 | 2 来自主题: PhotoForum版 - Ninja It is ninja b/c my son call it ninja. :d This one is my new favorite. You
probably would not use 35mm on such headshot normally, but this one turned
out decent. There is distortion, which in this case gave extra punch to the
eyes. The nose is hidden, so you won't see it gets distorted. |
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l*****s
发帖数: 1754 | 3 I know what are you talking about. But according to this review, the
distortion at 8mm is significant, outsides distort even more than the center
of the image, and he is suggestion to use 14mm.
I have not used this lens very often. I definitely need to do more testing
with it and find the sweet spot.
http://www.kenrockwell.com/sigma/8-16mm.htm#dist |
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h*******e
发帖数: 8370 | 4 再说一次，这跟distortion一点关系都没有。这不是因为distortion，是因为你没布置
好。比如，你可以试下把左下那个花瓶P掉，再看，很可能就不一样。
center |
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z***i
发帖数: 1122 | 5 刚刚发现Winogrand专门考虑过这个问题,他觉得他看到的是21mm,但离近了实在变形太
大,
所以才用了28mm:
Winogrand: Ideally, I wish I had a lens that took in my whole angle of
vision, without mechanical distortion – that’s the headache with these
things. Ideally, that would probably be the most interesting to work with.
The 28 is probably where the mechanical distortion is least limiting – much
less limiting than a 21. It’s closest to the angle of attention. It’s
pretty close to at least my angle of attention. Probably the 21 is more so,
b... 阅读全帖 |
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k**o
发帖数: 3006 | 6 ☆─────────────────────────────────────☆
KIOOD (准零袋弟子) 于 (Sat Feb 7 23:14:00 2009) 提到:
还记得LX-3的24mm变形是如何的小吧，最后被证实是在covert Raw的时候被强制校正的
结果。对于以出JPG为主的小DC其实也无可厚非，确实也方便了。现在photozone发现G1
的Raw在silkypix和lightroom转换的时候也被强制校正了畸变（无法turn off这个校正
）。那个随G1配的14-45镜头的筒形畸变居然达到了5.5%...
"You know what the funny thing is here. Panasonic did obviously want to hide
the massive distortion problems of this lens ... at cost of border
resolution. Ok, 5.5% barrel distortions are embarassing indeed ..."
http://www.pho |
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t******8
发帖数: 2803 | 7 D90拍RAW用NX2转成jpg，再用DxO批处理。同一批照片用不同参数处理了两次，第一次
处理完毕后将
成平转移到另一个文件夹，第二次处理的时候，DxO似乎抽风了。关掉重开几次才解决
。重启电脑以后继
续抽风……
第一幅为DxO修改前，尼康RAW用NX2直接转（CA、Distortion、Vignetting correction
all
OFF）
第二幅为DxO修改后，仅仅用DxO纠正CA、Distortion、Vignetting。结果明显可见枕状
变形更加
厉害了…… |
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e**n
发帖数: 5876 | 8 那就分别看看了:
解像度:
P+1445
S+1855
紫边:
P+
"Lateral chromatic aberration .. is therefore essentially nonexistent."
S+
"Chromatic aberration is reasonably well-controlled. As is normally the case
there's visible fringing towards the corners at wideangle, which is mainly
red/cyan in color. ..."
变形:
P+
"Distortion is below 1% at all focal lengths, meaning that in practical
terms you'll never see it."
S+
"Distortion is unusually high." |
|
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e***s
发帖数: 1397 | 10 但是用raw, 相机（Nikon）自带的比如noise reduction, distortion correction这些
功能不是没用了？distortion还还说，N+的noise reduction还是挺有用的吧？ |
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s**********s
发帖数: 4255 | 11 Fish-eye effect: Creates a barrel-shaped distortion similar to a fish-eye
lens. The effect can be adjusted, and, depending on the level of distortion,
the image periphery may be cropped.
Grainy B/W: Creates a grainy, black-and-white image. The effect can be
emphasized by adjusting the contrast.
Soft focus: Produces a soft result. This can be increased by adjusting the
blur.
Toy camera effect: Provides colour cast typical of toy cameras. The four
corners are also darkened. The image looks soft wi... 阅读全帖 |
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T********r
发帖数: 6210 | 12 Lloyd Chambers：
“The new 1.4X Canon EF Extender III is a much better performer in the
f/4 - f/8 range than the older Extender II. Anyone using a 1.4X regularly
should definitely upgrade to the new III version.
As an added bonus, the Extender III minimizes distortion, whereas the
Extender II shows quite noticeable barrel distortion.” |
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b******n
发帖数: 4509 | 13 It’s coming, really!
We posted the filed patent of a 24-70 f/2.8L II way back in October. However
it has now been published as of April 21, 2011. The big omission appears to
be IS. I think it’s safe to say the lens is coming soon.
Other Lenses in the Patent
A couple of other lenses appear in the patent. A 70-300 f/4-5.6L IS, which
has been released. Also appearing is a 55-250 IS lens. This could be a
version II of the current lens. It could also shrink to 200mm at the long
end.
Patent Informatio... 阅读全帖 |
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X*U
发帖数: 5518 | 14 是，但是大家已经都习惯了，没法改的
英文论坛上一样，都是distortion，distortion的叫 |
|
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l*****e
发帖数: 8596 | 16 google来的。
First, the portrait lens is not just about focal length. It is about
perspective too.
You will commonly be taking a traditional portrait that includes head and
shoulders, and you want it to look general to the viewers. That means you
don't want facial parts to look distorted or out of proportion.
Normal length from your subject to perform a general perspective is about 10
feet. You can perform this with a lens that is between 75mm and 150mm. If
your Camera is a "crop" sensor, you can u... 阅读全帖 |
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t*******f
发帖数: 2634 | 17 It came one day earlier then schedule. Fast focus,
especially on F100 -- while, F100 focuses fast.
Focusing is very quite as expected.
Like its big eye and the cute hood. It also has a new
rear cap, kind of surprised. It is significantly bigger
than 50/1.8G
It has slight geometric distortion, but much better than
35/1.8D DX. The 50/1.8D does not show geometric
distortions, so I think I will keep it (never thought of
let go anyway).
Happy with this new kid in town. |
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a***a
发帖数: 40617 | 18 去dpreview发帖吐槽了，坐等各种x100轮解释。。
小拽了一下
“
Yes, I admit I'm kind of picky and I bet some of readers of this post may
think the photo looks fine. But I once had experience dealing with some wide
-angle lens with literally no distortion, for example, hologon (if you have
no idea what this is, google it). So my bar of distortion is kinda high...
” |
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x*****g
发帖数: 3463 | 19 AF-S还没整明白就别折腾distortion了。。。。
上了D3000，肯定上35 1.8G啊
distortion |
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t*******f
发帖数: 2634 | 20 With flash indoor, GF2+14-42 pictures are much better.
Compared with D60+35G+flash. Not at same level.
Maybe 20mm will do a much better job. Will get it
on Monday.
14-42 has very large native distortions. GF2 corrects
distortions transparent to user. This is where sharpness
was killed. |
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d*h
发帖数: 2347 | 21 I would say try 50f1.8 first because it is cheap, plus you don't really lose
anything even if you don't want it, can sell it easily.
for new babies, they are small and lying in they back most of the time, you
need to be able to shoot quite close, and a lot of time, from the top to 45
degree down, so you might need a 35mm.
IMO, you don't need a 28mm, because of the distortion, unless this
distortion really works towards your favour...
try use your stock 18-55IS lens, that is what i did, keep tryi... 阅读全帖 |
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G****e
发帖数: 1386 | 22 糖爸说的是对的，一般情况下焦距决定视角，但是鱼眼很特殊，镜片突出为了获得夸张
的大视角和distortion，这样的设计跟同焦距的超广角镜头很不一样，而且普通超广对
distortion的修正会进一步减小视角。
pentax的鱼眼是10-17mm，180-100 degree. |
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f**s
发帖数: 968 | 23 链接在此：
http://www.kenrockwell.com/tech/8mm-f35.htm
8mm f/3.5 Fisheye
Pro-Optic, Samyang, Rokinon, Bower &c. (2009-)
© 2010 KenRockwell.com. All rights reserved.
Intro Specs Performance Compared Recommendations
8mm f/3.5 Fisheye, Pro-Optic Nikon AI-s version. enlarge. ($290, Korean, no
filters, 13.8 oz./391g). This one came from this link to it at Adorama (also
specifically in Nikon, Canon EOS, Pentax/Samsung and Minolta Maxxum/Sony
mounts). It also comes branded as Bower, also specif... 阅读全帖 |
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m***i
发帖数: 2480 | 24
50mm should be good for full body, upper body or head and shoulder.
You need 80mm + for head only to avoid distortion on crop DSLRs, unless you
want to correct distortion in lightroom. |
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l********e
发帖数: 3632 | 25 it is called Perspective, not distortion, even wide angle has distortions.
you |
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k*******n
发帖数: 108 | 26 上面讨论的24，50畸变，指的都是perspective啊， 不是你说的lens distortion。
话说定焦头， 一般lens distortion不是很严重， 因为光学上已经进了很大
努力纠正。
如果你要问纠正barrel distrotion是否有影响， 当然有影响。 因为本质上
是对照片像素的重新定位，这个肯定是有损操作的，或多或少影响画质的。 |
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w**7
发帖数: 5258 | 27 http://www.4-traders.com/FUJITSU-LIMITED-6492460/news/FUJITSU-L
Key Features of MB86S22AA:
Seventh-generation Milbeaut image processing
The chip delivers greatly improved optical correction capabilities through
an updated image processing flow, a new noise filter designed to achieve
balance between resolution and noise suppression, a newly developed circuit
for correcting focus drop-off at the edges, and improved distortion
correction and purple fringing countermeasures. MB86S22AA includes a new... 阅读全帖 |
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x****y
发帖数: 1853 | 28 光线从各个不同的角度入射到感光器上。离感光器中心越远，像差越大，所以同一个镜
头(无论焦距), 全幅的边角处比aps-c的边角更多distortion. 这种distortion在
telephoto lenses里不是很明显，因为光线以小角度通过镜头(近轴光学)几乎垂直入射
到感光器，即使在全幅的边角处; 广角镜里，光线以大角度通过镜头，在全幅的感光器
的边角处，光线入射的角度很不垂直，所以镜头的相差和感光器fall-out会导致
vignetting和畸变。
全幅DSLR的解决办法是把镜头半径做大，使得近轴范围覆盖整个感光器。在最大光圈是
还是很容易看到畸变。这是为什么很少广角的fast lenses。
Leica在感光器上镀了一层microlens,局部矫正边角处光线入射的角度，再加上数字矫
正，所以才得以继续沿用胶圈的M Lenses. |
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o**s
发帖数: 3412 | 29 What you said I kind of understand, 旁轴 expensive, 旁轴 good.
But it's like you are playing piano to a cat.
微单= mirrorless? so rangfinder smaller than mirrorless, by how much?
转接? this has to do with the viewerfiner thingy?
畸变=distortion, like wide angle distortion?
标头 is like 35mm or 50mm? |
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b***u
发帖数: 12010 | 30 这个头逆天在于几乎没有distortion。14-24在14端有4% distortion |
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m***z
发帖数: 166 | 31 多谢建议。
查了下，14-24比较符合我需求:
Pick the 16-35 VR if you…
Don’t need f2.8
Don’t need the ultra wide field of view
Do need a little more versatility with the focal range
Do shoot landscapes and general images (i.e. walkabout lens – as much as I
hate that phrase)
Do have an extensive range of filters that work with 77mm thread
Don’t mind having to fix some distortion from time to time
And pick the 14-24 f2.8 if you…
Want the very best optics
Need the extra stop of light (e.g. for serious wide field astrop... 阅读全帖 |
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E***e
发帖数: 3430 | 32 因为机身没有马达
所以考虑AFS的
但是看Ken Rockwell说这个镜头distortion很厉害
然后DigitalRev比较了f1.4的表现因为没有ED还不如Sigma
请问有朋友在用这个头么？
感觉如何？
最主要的是Nikon自家的distortion correction数据对这个镜头修复效果如何？
谢谢了！ |
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Y**i
发帖数: 6922 | 33 作为蔡头85/1.4 ZE的用户,我很真诚的告诉你,蔡头真的是一分钱一分货的.
撇开光圈和焦段这些参数,蔡头的颜色表现和分辨率真的非常的好.
紫边和Distortion后期可以纠正,蔡头也有紫边和distortion,这个无法避免.
但颜色表现和分辨率是蔡头的成像质素有别于其他头的关键.就算你们说谁谁谁家的头
也非常的锐.我也有佳能的红圈定焦.佳能的锐和蔡司的锐是不一样的.佳能的锐比较"脆
弱",我也不知道怎么来表达这种感觉,反正就是很单薄的感觉.蔡司的锐是浑厚的那种,
让我觉得稳稳的,看了心里踏实的那种锐.
再说颜色表现,蔡头的颜色表现秒杀佳能红圈.秒杀到就是佳能的头后期要花更多时间来
修图,而且怎么修也修不到蔡头简单后期后体现出来的油润.
我当时决定买蔡头85/1.4的时候也觉得很肉痛,但用下来觉得是一个正确的决定.蔡头所
带给我的performance我真的只能说:一分钱一分货.
如果你真的是追求图像质量的,选择蔡头绝对不会让你后悔. |
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f****a
发帖数: 847 | 34 这个好像还行， 是谁代工的？是fd mount?
不过测评一般
http://cannonfastreviews.com/toufive-star-28mm-2-8-auto-mc/
哈哈
Sharpness
f/2.8: A little bit soft and lower contrast, with some coma, spherical
aberration and a fair bit of chromatic aberration.
f/3.5: Doesn’t sharpen up much, but has better contrast and way less coma
and spherical aberration but still a fair bit of chromatic aberration.
f/4: Sharpens up a little bit more, but way better contrast and only a hind
of chromatic aberration.
f/8: Fairly sharp with good... 阅读全帖 |
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s******e
发帖数: 273 | 35 http://www.photozone.de/canon-eos/526-samyang8f35eos
The lack of AF may be a little tricky on the Samyang 85mm f/1.4 but this is
basically a non-issue on the 8mm f/3.5 Fisheye due to the immense depth-of-
field provided by such a lens - for most scenes just set the focus distance
to 2m and then be happy ever after. If in doubt (e.g. in very close focus
situations) you can, of course, use Live-View to fine-tune the focus
manually. Setting the (working) aperture directly on the lens may also be
so... 阅读全帖 |
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v******c
发帖数: 59 | 36 我用词不当。不是指distortion。Distortion 是直的照成弯的。20mm以下的焦段不好
用。距离近了，直线还是直线但斜的厉害。看着和人眼的感觉差很多。大师们要创新要
有风格可以。一般到此一游的不可能老那样，多半宁愿用长一点的焦段。那不就成24-
70，24-105了
: 网上测评不是说这个镜头边缘不畸变吗
|
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m***y
发帖数: 6 | 37 1. Radiohead: Kid A
It is an album you can’t leave behind, distorted
music, distorted world, are u in?
2. U2: All That You Can’t Leave Behind
Beautiful rhythms, deep lyrics, a great band.
3. Belle & Sebasitan: Fold Your Hands Child, You Walk Like A
Peasant
U know what means” precious”? All answers are in
the album.
4. Elliot Smith: Figure 8
If you are lonely, you will love it.
5. Majave 3: Excuses For Travelers
Music for lonely travelers. Why I love |
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l*y
发帖数: 21010 | 38 www.jonsavage.com/film
Bernard Sumner
[interview, April 1994]
Bernard onstage
Bernard Albrecht Sumner
I first met Ian at a gig at the Electric Circus. It might have been the
Anarchy tour, it might have been The Clash, or one of them punk groups. Ian
was with another lad called Ian, and they both had donkey jackets, and Ian
had “HATE” written on the back of his donkey jacket. I remember liking him
. He seemed pretty nice, but we didn’t talk to him that much. I just
remembered him. Later on, about... 阅读全帖 |
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m********l
发帖数: 4394 | 39 distortion of sense
vs
distortion of perception |
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c******o
发帖数: 1184 | 40 Will China stay on course?
By Fareed Zakaria, CNN
Events in the Middle East and North Africa are of historic importance, but
the even bigger, long-term story is the rise of China. What path will it
choose at home and abroad in the years ahead?
For decades there has been debate at the highest levels of the Chinese
government about how much to modernize politically to ensure growth and
stave off revolution.
It’s notoriously difficult to analyze the inner workings off the Chinese
Communist Party. ... 阅读全帖 |
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B******e
发帖数: 16928 | 41 So you think that crony capitalism is better than socialism? You think
market distorted with the distortion caused by how connected you are
dominates central planning? The fact that you do not deny the accusation
reveals something. |
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B******e
发帖数: 16928 | 42 So you think that crony capitalism is better than socialism? You think
market distorted with the distortion caused by how connected you are
dominates central planning? The fact that you do not deny the accusation
reveals something. |
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n********1
发帖数: 197 | 43 My God! Einstein is totally right about general relativity. Look at the
bridge distortion. It is the space distorted by the gravitational wave.
Apple should win the Nobel physics this year. |
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M****N
发帖数: 27 | 44 请原谅我，一稿多投哈：
片静与钱清的问题在于，他们被人类文明根深蒂固的distorted values所愚弄了：认为
只有男尊女卑、男人强女人弱、男人挣钱多女人少的家庭组合才平衡（包括内在与外在
的平衡）；如果女方突然挣钱多了，贡献大了，立马内心就不平衡了，嚷嚷着要change
；即使当事人内心平衡，外人马上也开始通过舆论来打破这种平衡。假如片静与钱清的
性别换一下，被愚弄了的当事人与外人可能就觉得Normal.
男强女弱的组合确实是当今文明的主流：所谓的“男主外女主内”，不过是外面是丛林
需要强者，家里是港湾需要诚服的服务者；所谓的“门当户对”，不过都是A男对B女。但
是这种所谓的男强女弱的组合真的就稳定平衡了吗？“男人挣钱养家，女人负责貌美如
花”的家庭有多少是“家里红旗不倒外面彩旗飘飘”？有多少是“拿着男人挣的钱给男
人买绿帽子的”？可以做一个离婚数据的统计，我敢打赌男强女弱的组合的离婚率不会
比女强男弱的低。
除了男强女弱与女强男弱，还有一种病态的稳定组合，那就是“斯德哥尔摩组合”。这
种组合中，一方绝对强势，另一方绝对服从，绝对强势方可以是男也可以是女，但大部
分是男，特别是... 阅读全帖 |
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M****N
发帖数: 27 | 45 片静与钱清的问题在于，他们被人类文明根深蒂固的distorted values所愚弄了：认为
只有男尊女卑、男人强女人弱、男人挣钱多女人少的家庭组合才平衡（包括内在与外在
的平衡）；如果女方突然挣钱多了，贡献大了，立马内心就不平衡了，嚷嚷着要change
；即使当事人内心平衡，外人马上也开始通过舆论来打破这种平衡。假如片静与钱清的
性别换一下，被愚弄了的当事人与外人可能就觉得Normal.
男强女弱的组合确实是当今文明的主流：所谓的“男主外女主内”，不过是外面是丛林
需要强者，家里是港湾需要诚服的服务者；所谓的“门当户对”，不过都是A男对B女。但
是这种所谓的男强女弱的组合真的就稳定平衡了吗？“男人挣钱养家，女人负责貌美如
花”的家庭有多少是“家里红旗不倒外面彩旗飘飘”？有多少是“拿着男人挣的钱给男
人买绿帽子的”？可以做一个离婚数据的统计，我敢打赌男强女弱的组合的离婚率不会
比女强男弱的低。
除了男强女弱与女强男弱，还有一种病态的稳定组合，那就是“斯德哥尔摩组合”。这
种组合中，一方绝对强势，另一方绝对服从，绝对强势方可以是男也可以是女，但大部
分是男，特别是在更早期的男权社会，现代... 阅读全帖 |
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c**r
发帖数: 10001 | 46 从今天起，给自己一个比较长期的project, 把<>（By
David Burns)的第九章“Why People Procrastinate”和第十章"A Prescription For
Procrastinators"陆续敲上来，献给想要改变自己延迁现状的朋友们，（以及发包子非
常大方的英明版头们！）
先说说这本书吧，很不错的书，对我自己帮助很大，不过我觉得最好的部分其实是第一
部分"You can change the way you feel"，分析十种distorted thinking, 以及
untwist它们的各种方法。说句题外话，因为各种原因而受抑郁或焦虑情绪严重困扰的
朋友，可以去看看这本书的第一部分，也许就会发现能够重新审视那些困住自己的“事
实”了。我这里并不摘录第一部分的东西，因为时间有限，想集中把关于延迁的章节敲
上来。
关于这样从中间摘录，其实也有些犹豫。最主要的两点：一是我刚才提到的distorted
thinking这个理论，算是全书的基调，我摘录的内容中应该还会提到，可能没看过前面
的人会觉得 |
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R*o
发帖数: 3781 | 47 by Dave Hunt
A Distorted Sovereignty
Having seen that Total Depravity is a key doctrine of Calvinism, we need to
understand that behind this belief is something even more fundamental: a gra
ve misunderstanding concerning the sovereignty of God. Singer reminds us tha
t "The secret grandeur of Calvin's theology lies in his grasp of the biblica
l teaching of the sovereignty of God." 1 In fact, he did not grasp the bibli
cal teaching but distorted it. Calvinism places such an emphasis upon sovere
ig... 阅读全帖 |
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l*****a
发帖数: 38403 | 48 这种情况并不稀少吧， 你看这个能解释得通么？
Psychological
Various psychological processes have been offered to explain experiences of
apparent precognition.
Cognitive failure/distortion models
Suited to explaining at least naturalistic occurrences of apparent
precognition are several more or less hypothetical unconscious cognitive
processes. These include:
Selection bias where people remember the "hits" and forget the "misses,"
remember coincidences more often than other non-coincidences, or when they
were correct a... 阅读全帖 |
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l**********t
发帖数: 5754 | 49
"you are distorting words. i am not mutation expert but here is some of my
humble opinion on this subject"
-- if you are not familiar with the subject, please don't start with an
allegtion about "distorting words", because I'm a biochem major so I know
what these terms mean in the context of biological science.
"mutation can be spontaneous mutation, or induced mutation. what we are
talking about here is presumably spontaneous mutation that has been
happening throughout the history of evolution"... 阅读全帖 |
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o***1
发帖数: 592 | 50 Even the Bible’s theology bears this out. The text offers numerous
occasions where God could have intervened to turn events to good and chose
not to. He could, for example, have obliterated Satan and the rebel angels
entirely, or at the very least confined them to Hell and not allowed them to
escape, so that they could never have escaped to lead humanity into
temptation. And God’s behavior in the whole Eden affair, in any case,
smacks strongly of either extreme incompetence or deliberate malice ... 阅读全帖 |
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