博客
qiang外双重测试，最新最火爆的Metabones Speed Booster（光圈增大转接环）优缺点大汇总，样图。
简单结论：
优点就不多说了，大家都明白。简单的说就是保持全副的视角，大一档的亮度，同时EF镜头有AE AF和IS。
缺点是，有些镜头的边缘会分辨率降低，比如50 1.2；有些镜头不会，比如135 2.0（中央分辨率全部都是提高的）。
全开时会增加少许散光，不过作者在文中表示缩一档光圈就OK了。
EOSHD：
Pros
1 stop increase in low light performance
Full frame look – wider field of view, shallower DOF, attractive vignette and light fall off towards corners
Extremely good value for money (look at the saving over buying alternative full frame video solution like Canon 1D X / 1D C)
Protects investment in existing glass
Match glass between full frame camera and Sony E-mount camera on multi-camera shoots
Corrects some optical defects in centre of the frame such as purple fringing and coma
In-camera electronic aperture control for Canon lenses on Sony body
Micro Four Thirds support in pipeline for March (and electronic adapter in June)
Turns Blackmagic Cinema Camera into Super 35mm (matching Alexa)
Every lens now has dual focal length and aperture (use with or without adapter to change crop)
More creative possibilities
Excellent build quality
Very small and light
Tripod mount
Infinity focus tuning built into the adapter and straight forward to use
Cons
Corner and edge sharpness a bit of a struggle with most legacy glass at fast apertures
Soft corners and edges most noticeable at infinity focus with fast apertures or wide open
Speed of auto-focus in need of improvement (painfully slow compared to same lens on a Canon body)
Some lenses are not yet fully supported by the electronics
————————————————————————————————————————————————————
LENSRENTALS：
Conclusions
I think it was pretty obvious that I came armed for battle, ready to slam this product as some marketing overhype. I was wrong less correct than I might have been. The Speed Booster does what they claimed it would do, much to my shock and surprise. It creates a wider-angle, greater aperture lens while retaining resolution and acutance.
It does increase astigmatism a bit, although I doubt this will cause anyone problems unless someone is trying to shoot landscape photography with it. It also seems to create some highlight blooming at very wide apertures. Again, nothing that can’t be worked around and probably not something that will be noticeable with anything but the widest aperture lenses.
It is going to take a while and a lot of people experimenting before we find out what combinations of lenses and cameras are awesome with it, which are fairly good, and which fairly bad. They won’t all be the same. But I suspect most of them are going to be pretty good. And this is going to be a very useful tool.
Most of the little foibles I’ve seen (including the part about adapter tilt) really only apply to photographers trying to tweek every drop of resolution out of their high-resolution sensor. Video, even 5k video, is more forgiving of a slightly weak corner or a bit of astigmatism.
无忌Huchiz 摄友的贴，《qiang外双重测试，最新最火爆的Metabones Speed Booster优缺点大汇总，样图。》链接如下：
http://forum.xitek.com/thread-1117257-1-1-1.html
优点就不多说了，大家都明白。简单的说就是保持全副的视角，大一档的亮度，同时EF镜头有AE AF和IS。
缺点是，有些镜头的边缘会分辨率降低，比如50 1.2；有些镜头不会，比如135 2.0（中央分辨率全部都是提高的）。
全开时会增加少许散光，不过作者在文中表示缩一档光圈就OK了。
EOSHD：
Pros
1 stop increase in low light performance
Full frame look – wider field of view, shallower DOF, attractive vignette and light fall off towards corners
Extremely good value for money (look at the saving over buying alternative full frame video solution like Canon 1D X / 1D C)
Protects investment in existing glass
Match glass between full frame camera and Sony E-mount camera on multi-camera shoots
Corrects some optical defects in centre of the frame such as purple fringing and coma
In-camera electronic aperture control for Canon lenses on Sony body
Micro Four Thirds support in pipeline for March (and electronic adapter in June)
Turns Blackmagic Cinema Camera into Super 35mm (matching Alexa)
Every lens now has dual focal length and aperture (use with or without adapter to change crop)
More creative possibilities
Excellent build quality
Very small and light
Tripod mount
Infinity focus tuning built into the adapter and straight forward to use
Cons
Corner and edge sharpness a bit of a struggle with most legacy glass at fast apertures
Soft corners and edges most noticeable at infinity focus with fast apertures or wide open
Speed of auto-focus in need of improvement (painfully slow compared to same lens on a Canon body)
Some lenses are not yet fully supported by the electronics
————————————————————————————————————————————————————
LENSRENTALS：
Conclusions
I think it was pretty obvious that I came armed for battle, ready to slam this product as some marketing overhype. I was wrong less correct than I might have been. The Speed Booster does what they claimed it would do, much to my shock and surprise. It creates a wider-angle, greater aperture lens while retaining resolution and acutance.
It does increase astigmatism a bit, although I doubt this will cause anyone problems unless someone is trying to shoot landscape photography with it. It also seems to create some highlight blooming at very wide apertures. Again, nothing that can’t be worked around and probably not something that will be noticeable with anything but the widest aperture lenses.
It is going to take a while and a lot of people experimenting before we find out what combinations of lenses and cameras are awesome with it, which are fairly good, and which fairly bad. They won’t all be the same. But I suspect most of them are going to be pretty good. And this is going to be a very useful tool.
Most of the little foibles I’ve seen (including the part about adapter tilt) really only apply to photographers trying to tweek every drop of resolution out of their high-resolution sensor. Video, even 5k video, is more forgiving of a slightly weak corner or a bit of astigmatism.
无忌Huchiz 摄友的贴，《qiang外双重测试，最新最火爆的Metabones Speed Booster优缺点大汇总，样图。》链接如下：
http://forum.xitek.com/thread-1117257-1-1-1.html
