Sony A7/A7r/A7s 放毒贴－－器材，转接，心得，后期......

Wolongshan

dd

Wolongshan

我定的机器还没有到，先纸上谈兵聊一聊。

1. a7/a7r/a7s的选择（转）

http://www.bhphotovideo.com/expl ... odel-suits-you-best



While the Alpha a7, a7R, and a7S share many qualities, they each offer specific features and specs that differentiate them from one another. The list below presents different kinds of photo and video work, and recommends the a7-series camera that's preferable for the application.
               
Wedding and Event Photography
For weddings and event photography, the Sony a7 and a7S are the best choices—the a7 for its faster autofocusing, and the a7S for its unrivaled low-light imaging abilities, 4K video capture, and a truly Silent Shutter mode.
                  

Portrait and Fashion Photography         
The 36.3MP resolution and exacting details offered by its filterless design makes the a7R the clear choice for this application.
Exception: if you shoot portraits or fashion outdoors, the faster maximum sync speeds of the a7 and a7S offer an advantage.
         
Sports and Action Photography         
The fast and accurate autofocus of its Hybrid AF system, and the faster continuous shooting speed make the a7 the best choice for shooting sports and other fast-moving subject matter.

Landscape Photography         
With its high-resolution sensor and omitted anti-aliasing filter, the A7R would be a good choice for capturing the details usually important to landscape photography. In addition, fine art landscape photography is often printed in large format, which is supported by the high-resolution a7R.

Exception: when shooting in locations with extreme contrast between the highlights and shadows, the high-dynamic-range capabilities of the a7S would retain more information in the shadows, without overexposing the highlights.
  
Vintage Lens Users         
For the many photographers who are choosing lighter-weight mirrorless cameras in order to utilize compact, high-quality rangefinder lenses, such as those by Leica and Voigtlander, the a7S may be the best choice. Its gapless on-chip lens design improves light distribution across the sensor, reducing the vignetting that can occur when using lenses designed for film cameras.

                  
Photojournalism and Street Photography         
With the fastest continuous shooting rate and faster autofocus, the a7 is the way to go for street, documentary, and journalistic applications. In addition, a 1/250-second flash sync helps when shooting with fill flash outdoors, and the electronic first-curtain shutter provides more quiet activation. Normally, this type of photography does not require maximum resolution, and the faster processing speed of smaller files is an advantage in the news world.
         
Exception: the potential for damage on the street and in the field makes the magnesium-alloy, weather-sealed bodies of the a7R and a7S appealing. Plus, if the utmost silence is a concern, the silent mode on the a7S is a benefit. It is absolutely silent.         

Still Life Photography         
Resolution and details are paramount in still life work and for this, the a7R with its 36.4MP filterless CMOS sensor, offers the highest resolution and superb details.

Exception: if you're shooting still life in very low light, it might be worth considering the a7S with its low-noise, high-ISO capability.

       
Night Photography         
Here, the a7S has the clear advantage. A native ISO sensitivity to 102,400 (expandable to 409,600) will enable very effective low-light capture. Also, with its wide dynamic range, city lights and dark shadows can be balanced within the frame and the improved signal-to-noise ratio reduces noise at high ISO levels. In addition, AF sensitivity to -4 allows improved AF accuracy in low light.

Nature Photography         
The faster continuous shooting and hybrid autofocus system in the a7 allow you to capture images of fast-moving animals. Furthermore, the AF Predictive Control feature on the a7 recognizes movement to or away from the camera and calculates where the subject should be in the instant between continuous shots.

Exception: the a7S has the advantage of better battery life, which will help on long outings into the woods. It also has the silent mode, which is clearly an advantage when photographing wildlife.

Mirrorless Enthusiast         
For the user who is ready to make the leap from point-and-shoot cameras to mirrorless, or one who prefers the compact form factor of a mirrorless camera over a DSLR, the a7 is the most affordable full-frame camera currently available and combines the practical control of a smaller camera with interchangeable-lens options and the light-gathering, resolution, and depth-of-field control of a full-frame sensor.

Exception: if you are a photographer who wants to use their camera for producing high-quality video as well as still images, the a7S is the option for you. While all three cameras offer Full HD capture, the a7S stands out with its ability to handle 4K video.         
                  

Cinema-Style Video Shooting         
The a7S is the best choice for controlled cinema-style video shoots. It offers far better dynamic range, a much more detailed 1080p image with less moiré and aliasing than the other cameras, a more robust XAVC S Codec when shooting in 1080p, a much cleaner image at high ISOs, and the ability to shoot 120 fps slow motion in 720p. Its ability to output UHD 4K video to an external recorder is just icing on the cake, seeing as the a7S is such a formidable performer in HD video capture.

Live Event or Concert Video Shooting         
If you're shooting live events or concerts, then you will probably be using telephoto lenses and panning around to follow the action. In situations like this, the a7R would be the best camera of the three. Its better rolling-shutter performance compared to the a7S, and more detailed video compared to the a7, make it the best choice.

Exception: if you're shooting in very high-contrast situations or in very low light and you can get close enough to use a lens wider than 100mm with a tripod, the a7S’s superior overall video quality makes it the better choice.         
                  
Documentary Video         
For shooting talking head interviews and controlled B-Roll footage, the a7S is a great documentary camera. A full-frame sensor makes it easy to shoot interviews with a defocused background, even in cramped spaces. The high dynamic range and more flexible picture profiles allow you to get B-Roll footage in almost any environment without setting up lights. All three cameras are also compatible with Sony’s XLR adapter, making it easy to get good audio without having to sync in post.

Exception: if you will be shooting handheld, run-and-gun work, consider the a7R. Its rolling shutter is a little better (fast pans and shaky hands don’t mix well with rolling shutters). Plus, the softer overall image on the a7R makes focusing on the fly a little more forgiving.

Film Students         
A helpful aspect of the a7-series cameras is that they handle very similarly. They all have the same control layout, the same focus aids, they use the same lenses, and have the same-sized sensor. Once you get used to shooting with one, it’s easy to move to another. Because of this, the a7 might be the best choice for film students. It's significantly cheaper than the a7S or a7R, and the differences in video image quality won't impede your creativity. Having an extra $1,000 to spend on lenses shouldn’t be overlooked.

Exception: if your budget isn't a barrier, the a7S is the best overall video camera.

         

Wolongshan

a7系列与单反和其他微单的整体比较。
优点：
1. 最小的全副机，比很多小底的微单都小
2. 可以转接几乎所有镜头，没有焦距调整的困扰
3. 全画幅，画质比绝大部分单反和所有其他微单都好，基本在 5DIII和D800的水平。
4. 可以使用A口单反的镜头，实现自动对焦。新一代sony接环（LA-EA4）对焦速度非常快
5. 4个拨盘，操控性一流
6. 峰值和放大对焦结合，手动对焦非常容易

缺点：
1. 开机启动速度很慢，一般2~3s,重新装电池后，第一次开机更慢
2. 电池寿命很低，只有300张左右，低于绝大多数的单反和微单
3.  a7/a7r 快门声音很响，影响拍摄。
4. a7/a7r 快门震动问题严重，上三脚架用接环时，机身明显震动。有几位拍风光的进了a7r后又都出了
5. 使用LA-EA4，由于半透膜失去 1/3档光线(a7s无所谓)，只能用中心点对焦（先对焦，再重新构图）
6. 不是触摸屏
7. 光线好的时候，对焦速度和入门单反类似，光线不好的时候对焦坑爹。a7s是例外，弱光对焦胜过一般单反。
8. a7拍夜景，点光源有绿帽子，影响所有夜景表现。
9. 连拍，追焦比专业单反还有很大差距。想要拍运动，飞鸟的基本可以忽略。

a7, a7s, a7r对比：
a7是平衡机，比较全面。
a7r是像素机，适合静态摄影(Studio, 风光，静物之类)
a7s是高感机，像素略有欠缺。

a7s的优点：
1. 最适合转接，a7和a7r转接非单反35mm以下的广角镜头，画质都明显下降（红移＋边角画质差）；a7s相对好很多
2. 高感性能好1.5~2档左右，弱光下不再需要大光圈
3. 弱光对焦性能明显提高，已经超过普通单反
4. 高ISO动态性能非常好，D4, 1Ds级别
5. 低像素的优点：不挑镜头，wifi等上传迅速，后期省时间
6. 静音模式完全静音拍摄，这个是a7/a7r受到普遍诟病的问题。静音使街拍更自然。
7. 机身质量比a7更好，镜头接口金属触点。

a7s的缺点：
1. 细节表现不如a7/a7r，毕竟像素低一点
2. 贵
3. 截副镜头使用时，由于像素太低，基本没有意义。


总结：推荐a7s，其次a7，a7r最不推荐。
a7/a7r都是第一代产品，都有一些致命的问题。a7s算一代半，貌似改进不少。
a7s有太多的优势。唯一像素少点，其实家用足够足够了。

Wolongshan

我转接的态度是，镜头体积或者成像比原生镜头有明显提高。否则还是原配好了。

转接接环：
Canon 自动接环
这里有Metabones 的($300)4代接环和其他山寨版本($100左右)。自动对焦速度比用佳能单反明显下降，我个人认为，除非有很多佳能镜头，做个备机使用，否则意义不大，不如手动了。



Contax G 自动环
http://www.deo-tech.com/products/product-01/
从评测来看，3代梁环配合a7系列使用G35, G45的组合，对焦速度明显提升(<1s)，使用其他G头或者nex机身，对焦速度和精度都表现一般。有时有不能识别镜头，自动关机等问题。如果不是冲着G头的素质，也没必要折腾。



sony A口 自动环
唯一可以达到单反对焦速度的接环，可以使用所有sony A口的蔡司头快速自动对焦，也可以使用美能达相对廉价的自动镜头。不过A口的单反头都比较大，除非为了镜头素质，还是用FE的原装镜头。



M口镜头接环
一般山寨环$10, 好的Metabones$100左右，只能手动对焦。由于M口的镜头很小，是比较适合转接的。有些接环带近摄功能，最好的是Voigtlander close focus M adapter（$300），可以免除M头最近对焦距离普遍很远的问题。


移轴接环
可以接各种镜头到FE口，实现移轴效果。个人觉得可以玩玩，真要出片效果还是不行。


完整的接环信息
http://briansmith.com/sony-a7-a7r-lens-mount-adapters/

bt123123

I had a7 kit....
want to buy another 定焦

kawara

安慰下，你的A7S应该能赶上

ylbeethoven

买了A7+FE55，这机器玩老头挺方便的。我的M42的35,58,85,135感觉视角跟之前完全不一样。特别是35，整个比APSC大一圈，很爽。

kawara

A7+ 狗头 JPEG 还比不过黑卡一代

Wolongshan

转接的镜头，我这里按焦距分成4段，由广角说起。




FE 16-35 F4
这个镜头年底出来，体积重量超过24-70F4，基本和ZA16-35F2.8差不多大了，画质可能不如，还少一档光圈，价钱还不便宜。(超广角拍风光，要的就是锐)。有点尴尬。F4和F2.8在拍星空的时候差很多，我不会选这个镜头。FE的超广角镜头，貌似都不会太小。


镜头照片还没有，用24-70fe代替



VM15mm F4.5
35mm以下的旁轴rangefinder广角镜头，在a7/a7r上表现都不行，a7s上测试还不多VM的15mm F4.5貌似表现不错。广角镜头由于景深比较大，手动对焦非常容易。这个头Stevehuff在a7s上测试过，效果不错，用来挂机随拍有体积优势。VM的结构，广角没有畸变，拍室内，建筑会很不错，而且价钱也便宜。边角性能不能要求过高，拍风光估计够呛, 但是这是小巧的唯一选择。




Nikon 14-24 F2.8
单反超广角的代表，用其他单反头也差不多。大而且重，但是素质一流，适合上三脚架拍风光，星空。其它佳能等单反镜头跟这个差不多。但是a7/a7r 有严重的机震问题。a7s接14-24拍夜空，虽然像素少了一点，借助强悍的高感，效果应该不错。


Zeiss ZA 16-35 F2.8
Sony FE口估计不会出f2.8的变焦头了，要自动对焦，F2.8 这个是唯一选择。缺点是大，重，贵。比14-24稍微差一点，拍风光也很不错。

Wolongshan

kawara 发表于 2014-9-12 12:53
A7+ 狗头 JPEG 还比不过黑卡一代

这个我不信，要看怎么比

Wolongshan

35mm ，35mm是最主要的人文焦段，适合随拍，手机的镜头基本上也是35mm左右
这个焦段非常适合转接，手动对焦比较容易，选择也很多



FE 35mm F2.8 这是sony的原生头，体积小，重量轻。但是f2.8的光圈，$800的价格，全塑料的手感，实在是坑爹。从出片来说，仍然是很好的选择，只是实在没啥玩头。样子和a7还是非常配的。


Contax G35 F2
另外一个小巧的选择，用三代梁环自动对焦表现不错。和徕卡七妹号称(the king of bokeh）一样的构造、一样的玻璃、一样的mtf。身价只有七妹的1/4 （二手$600）。大光圈f2、f2.8分辨率不高，反差低，层次丰富，过渡优美。G35是g系列里最小巧的一个。可惜是自动头，对焦时马达声音毕竟吵，精度速度也一般。


Loxia 35 F2
蔡司为FE口定做的手动镜头，年底出货。几乎可以不用怀疑，这个头将是FE口素质最好的一个35mm，其它M口手动头分辨率啥的都会比它差一点。手动出片的最佳选择。不过它尺寸不小，价钱也不便宜($1300)


ZM35F2, VM 35 F1.4 VM35 F1.2
这几个都是M口的手动头，基本成像好的体积大，小巧的就成像一般。对比Loxia，体积，价钱优势也不明显（包括接环)。其中VM35 1.4最小巧，而且有大光圈，便宜，可以作为手动头小巧的选择。不差钱就ZM35 F2，素质会高很多。VM35 1.2适合大光圈爱好者。

尺寸从小到大
VM 35 1.4


zm35 f2


VM 35 1.2



35mm的镜头，各有优缺点，只能根据个人的使用习惯选择，没有最好。
另外高富帅的徕卡头，有米的只管上。

Wolongshan

标头，50mm, 转接的又一个热门。个人以为35-50mm是旁轴的最适合焦段，长焦尺寸太大，失去对单反的优势了。



FE55mm F1.8
这个sony的原生头非常给力，全开锐度转接任何镜头都难望其项背。缺点是贵，大，塑料。F1.8的标头，N,C都是$200, 这个感要$1000。不过仍然是出片的不二选择。这个标头做的太好，使得大部分转接的失去了意义。除非体积明显更小，或者光圈更大(f1.2以上)。


G45 F2
G头的典范，锐度反差非常好，还有 g头的色彩...。蔡司号称“G45是人类最好的标头”，也有评测为全球顶级镜头之一。价格便宜($500)，非常小巧，而且可以自动对焦。



Loxia 50 F2
蔡司为FE口出的手动头，明年初有货。素质不用怀疑，我认为是唯一可以超过55 D1.8的头，尺寸略小，价钱略便宜，但是我觉得都不足以补偿原生头自动对焦的优势。


ZM50 F2, ZM 50 F1.5， VM 50 F1.1
有了Loxia 50 F2,感觉这几个头用处不大，尺寸价钱都没有优势，画质估计不如。



Mitakon 50 f0.95
国产牛头，应该是电影头。0.95的大光圈是卖点，体积重量有点大，可以玩味一下，实用拍视频应该不错，拍照出片不会太好。



其它一些老头，基本除了便宜以外，都不值得考虑了。