评测:佳能N500 PTZ相机
测试佳能CR-N500
具有1传感器和15倍f/2.8-4.5 optical zoom lens, the N500 has very similar specs to the Canon XF605 camcorder. 最大的区别是N500有一个DIGIC DV6处理器, 而XF605则拥有较新的DIGIC DV7处理器. 当我并排测试两台相机时, the XF605 has better low-light sensitivity so this leaves me wanting the newer DV7 processor on the N500, 以及它的4K/60P拍摄能力, 而不是4K/30P. I honestly don’t need 4K/60P in a PTZ and 4K/30P is just fine but it would still be nice to have. I should also note that the HDMI and NDI output is capably of 4K/30P but the HD-SDI uses the 3G standard, 限制在1080/60P.
On the N500 I typically find I’m using 12-24dB of gain for typical indoor conference shoots but the gain is very 清洁, 多亏了大的1”传感器. I didn’t like the default auto noise reduction setting as I found it resulted in soft images, 所以我手动把降噪调低了.
连接和上电N500
我把我的n500 (图3)连接到Netgear M4250 AV线路交换机. This is a professional AV switch that is designed for professional audio and video applications, 例如NDI和以太网供电(POE)设备. 使用M4250的优点是它简化了我的设置. 而不是运行一个单独的SDI和电源线到每个PTZ, I can run a single ethernet cable for both power and NDI video to my switch. This also eliminates the need to have a multiple-input video capture device, like my Sonnet Thunderbolt3 enclosures that houses a 4x HD-SDI input Blackmagic Design video capture card.
图3. 佳能N500连接器
Reducing the number of video and power cables I need to run saves me setup time and reduces the number of cases of equipment I need to transport. 这对单镜头制作来说没什么大不了的, but when you run multiple PTZ cameras and they are a few hundred feet away from the technical director position and available power, you really begin to appreciate the convenience of POE and NDI over a single cable.
对于那些刚进入PTZ和NDI世界的人, POE is Power Over Ethernet and it allows you to power the connected devices through the ethernet cable. NDI is the protocol developed by NewTek to transmit video over ethernet. You simply connect multiple NDI devices and your computer to a POE switch, 启动你最喜欢的ndi兼容软件(我使用vMix).,但OBS和tricaster也支持NDI), and operate almost the same as if you had connected a video camera via SDI or HDMI to a video capture card (图4).
图4. 佳能N500在现场
PTZ代表潘, 倾斜, 变焦, which are three of the settings you can remotely operate on PTZ cameras. 在控制器方面, 佳能有一个RC-IP100 PTZ控制器, 它有一个操纵杆和触摸屏. SKAARHOJ有一系列的控制器，包括PTZ Fly, PTZ职业, 和PTZ Extreme使用新的佳能XC协议. I control my N500s through vMix using the Sony Visca Protocol and an Xbox video game controller or the free Canon Remote Camera Control Application (图5). I find I mostly record a bunch of preset shots in each camera and recall one on a preview camera before switching to them live as the program camera. I also use this same preset feature to pan one camera between different presets, 具有设置运动持续时间的能力. 最后, I can also make live framing adjustments on the Xbox controller smoother than a camera operator could.
图5. 佳能遥控相机控制应用程序
The trade-off when using NDI|HX and POE on a PTZ vs SDI or HDMI and an AC power adapter is the simplicity of a single cable connection and working with a more compressed video signal. 一次制作, I connected both NDI and SDI from the same PTZ camera at the same time to see if my staff and I could see the difference in the video quality. They weren’t but I was able to see the slightest shift in the black levels, 但在我看来并非如此, the video was too similar to discern any other differences in this application.
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