HD Camcorders for Webcasting
专业摄像机对实时切换和网络广播的要求可能与其他市场不同, 但最终我要找的是一款性能优于同级别其他摄像机、价格低于预期的摄像机.
我一直在寻找下一件大事,当它涉及到一个负担得起的高清摄像机的实时视频切换和网络广播. 这个市场对专业摄像机的要求可能与其他市场不同, 但最终我要找的是一款性能优于同级别其他摄像机、价格低于预期的摄像机.
在评估我自己的视频制作公司使用的摄像机时, 大多数时候,我都对缺少一个重要功能感到失望, 通常是保留给更昂贵的相机系列. Usually my top camcorder selection is a compromise and comes with caveats: high cost relative to similarly equipped cameras; living with and designing workflow solutions for missing professional features; or just poor ergonomic design. No one camera can do it all, 甚至当您将需求缩小到特定的工作流程时, 你经常会选择一个不适合其他工作流程的相机.
数码单反是一个很好的例子,相机的外形因素,是伟大的手持事件拍摄, but is limited when you need a 20x zoom lens, XLR audio inputs, HD-SDI or full-size HDMI outputs, long record time, ND filters, zebras, histograms, and countless other professional features. 大传感器视频摄像机解决了许多与用于视频的dlsr相关的问题,但增加了成本. Finally, 与大传感器摄像机和DLSR型号相比,最近的摄像机开发和功能相当无聊和有限.
Pros and Cons of the Canon XA20/25
In general, 小传感器摄像机的图像质量总是不如为视频设计的同类大传感器摄像机的图像质量. The reason comes down to pure physics, 较大的单个像素传感器比较小的传感器具有更多的信息. 单个大传感器成像仪在图像质量上的巨大飞跃,是许多视频制作公司接受大传感器摄像机和单反相机的原因.
Personally, 我对大多数小传感器摄像机不太感兴趣,因为我知道用大传感器摄像机可以拍出更好的图像. This hasn’t stopped me from checking out the Canon XA20/25 at NAB 2013, buying a Canon XA20 in December 2013, choosing the XA25 as a “Gear of the Year” selection in April 2014, and throughout this time, 在2013年和2014年的文章和会议上,多次推荐佳能XA20小传感器相机. To me, that camera was a great value with its 20x f/1.8-2.8 lens on a 1/2.8” sensor, its OLED screen, and dual image stabilization. I also liked its WiFi connectivity and control, dual SDXC slots, XLR inputs, ND filters, and affordable cost of $1,999.
我将它用于手持工作,因为我的索尼FS700和FS100由于LCD放置和整体人体工程学设计不佳而不切实际. 我用它来拍摄会议,我需要一个单独的相机,可以用同一个镜头放大, zoom out really wide. I also used it as a third camera angle, 通常是一个反角度的观众镜头或广角镜头,作为稍后与PowerPoint幻灯片同步的参考,并作为备用角度.
但我没有把它用于法律视频取证因为它没有时间和日期戳. 我没有在采访中使用它,因为它无法提供令人愉悦的浅景深. 当我想用大型摄像机给客户留下深刻印象时,我没有使用它,因为它太小了. 我经常开玩笑说,我希望有时我能把它放在一个更大的相机机身上,这样它看起来会更令人印象深刻. 我也不喜欢用它进行视频切换和网络广播,因为它没有HD-SDI输出, and the more-expensive Canon XA25 had only a 1.5G HD-SDI output, 而我想要一个可以处理渐进式视频的3G HD-SDI输出, HDMI输出端口是mini-HDMI端口,我想要一个全尺寸的HDMI输出.
Ultimately, the XA20’s image quality was great in normal use, but when I pushed the gain or ISO to its limits, 我的形象变得过于嘈杂或忙碌,留下了一些需要的东西.
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Unlike most camcorders in its price range (MSRP $1,999) and compact form fact, 索尼PXW-X70拥有坚固的传感器尺寸(1英寸)和许多其他专业功能, including dual XLR audio inputs, dual recording slots, 3 ND filters, a full-size HDMI output, 3G HD-SDI output, and NFC and wireless LAN control, along with future upgrading to 4K UHD internal recording.