本帖最后由 派乐3D 于 2012-9-25 13:04 编辑
5D2以其出色的视频功能和广泛的佳能镜头支持，在普通后立即成为了众多影视制作人员手中的利器。但对于拍摄3D视频来说，双机同步非常重要，很遗憾的是，5D2无法进行快门及帧同步。但如果想用5D2拍摄3D视频，还是有一些同步的窍门可以使用。下面就引用一篇国外达人门总结的一条经验，看看他们是如何来同步5D2来进行3D拍摄的。（此方法理论上支持众多视频功能的DSLR相机，比如7D等，可自行按此方法进行测试）
Every month we receive dozens of calls from Canon 5D & 7D owners worldwide asking us how they can gen-lock their DSLR cameras to shoot “in sync” 3D. Unfortunately, we’ve had to tell them that it wasn’t yet possible to gen-lock any of the Canon DSLR cameras, or Nikons for that matter. And yes, you can shoot 3D without gen-locking your cameras, but the 3D will be misaligned and you can’t fix it in post. We’ve tried, trust us. As a matter of fact, we won’t take a 3d production job if the customer isn’t using gen-locked cameras. Why? Because the frames won’t match up, or align and we don’t want to be blamed.
But now, thanks to Peter Clark at Attic Studios, ingenuity has succeeded once again. Mr. Clark has devised a simple, field-tested method for "syncing" (not true gen-locking - but close) the Canon 5D mark II DSLR cameras, and thus creating beautiful, aligned, “in-sync” 3D.
Bla bla bal……
Here’s what Mr. Clark suggests to start with, when building a 3D rig using Canon’s 5D Mark II: 准备内容：
- 2x Canon 5D Mark II's (relatively same age & usage for consistency of shutter age)两台5D2相机（使用寿命快门相近） - The 3D Film Factory’s 3D-BS MINI or INDIE (beam-splitter) RIG (depends on the needs of the project) 3D拍摄支架（推荐的是他们自己的，不过我得推荐我们自己的国产货哟：D，派乐3D立体拍摄支架系统）这个是根据拍摄需要- 2x Canon F1.2 50mm L lenses (set to manual) 两支镜头…… - Fresh AAA batteries in battery grip (power supplies may cause power flux) 足量的电池 - Canon made battery grips 手柄 - 3x Pocket Wizards Plus II with shutter sync cables (CM-N3-P), one tethered to each camera and one to control shutter release remotely. Again, use fresh batteries. 这个什么控制器，主要是能实现同时遥控两台相机快门的目的吧，其它什么能实现的也行 - 2x Sandisk Extreme IV 8GB CF cards 卡
步骤：
First, make sure both cameras are restored to the factory settings and in full “manual mode” with freshly installed firmware 2.0.8. 首先：升级两台5D2固件到2.0.8
When you’re ready, start both cameras recording video. Then, while both cameras are still recording, take a still frame using the pocket wizard. In this scenario, the cameras should respond simultaneously (you will hear a zipping sound, the shutter). 然后，将两台机器都开始录像，按下控制器拍一张照片，此时两台机器同时反应，可以听见快门声
The theory here is - that the act of taking a still photo while video is rolling "resets" the sensors and begins them scanning at the same pixel line. It seems that as long as the batteries on the Pocket Wizards are fresh, the trigger will remain accurate within a few m/s. Either way, as long as the sensors are scanning in the same direction and not totally out-of-phase, the flickering effect and eye-strain are eliminated - and the resulting 3D is NOT out of sync.
然后就……可以了。 理论：在录像的过程中拍一张照片就相当于重置了传感器，使得两台机器的拍摄同步到同一扫描线位置上。
Although this method may seem less than scientific – when tested repeatedly - it worked perfectly on every take.
In order to view the footage in stereoscopic 3D, you simply ingest it into Final Cut Pro (FCP) and setup for side-by-side viewing. Dashwood or Neo3D Cineform might work better, if adjustment was needed, but we had good-looking alignment from the get-go. We proceeded to use a Matrox i/o box to mux the signal to an HDMI out, then to an over-the-counter plasma 3DTV.
We used Black Magic’s mini converters for HDMI to SDI and AJA’s Hi-5 3D for muxing. It should be noted that the live, real-time, 3D monitoring didn’t work because the HDMI signal coming out of the 5D's was bad. We tried several logical remedies, including re-patches and converters, but no success.
You may also want to try using a photoflash strobe to check the gen-lock . You can see if the sensors are scanning at the same line, as you will get a half white frame when using flash photography (with CMOS rolling sensors).
Bla bla bla……
手中有两台5D并想拍3D的达人不妨试试 | 
发表于 2012-9-17 15:08
楼主
我也想翻译呀，水平有限呢