腾讯数码讯（编译：刘沙） 尼康D5200是一款定位中低端市场的数码单反，与自家兄弟D3200一样，采用了2400万像素的APS-C画幅传感器。不过，尼康D5200的传感器将拥有更广泛的动态范围支持，这是与价格更便宜的D3200所不同的地方。售价方面，单机价格为899.95美元（约合人民币5590元），包含18-55 mm VR镜头的套机价格则为1047美元（约合人民币6503元），与宾得K-5 II和富士x-e1处于同一价位上。

尼康D5200看上去更像是一款综合自家产品特点的机型，除了与D7100和D3200相同像素但不同特点的传感器设计，还配备了与D5100类似的可翻转屏幕，同时还使用了D7100的对焦系统。而从它的设计上来看，无疑是更接近D5100的，外观十分紧凑。尼康D5200还搭载了EXPEED 3图像处理引擎，支持ISO 100-6400的感光范围，而在扩展模式下，则可最高达到ISO 25600。

对焦方面，尼康D5200搭载了Multi-CAM 4800DX 自动对焦模块，可实现39个对焦点（包含9个十字对焦点），达到了D7000的级别，这也是相比前作D5100所提升的部分。更多的对焦点和高速对焦系统，可以让D5200获得更好的连拍性能，尤其是在拍摄体育比赛时更具优势。它还支持5FPS的高速连拍功能。另一个从D7000上借鉴过来的功能，则是2016万像素的RGB测光传感器和更好的白平衡补偿功能，它们能将更多信息代入到自动场景识别系统，并匹配曝光设置，从而实现更精准的自动对焦和白平衡效果。

与前作类似，尼康D5200也内置了多种特殊的滤镜效果和硬件HDR模式，可以将两张照片合并为一张具有更好阴影和细节的照片。当然，这些模式只能使用在JPEG输出模式上。尼康D5200还支持高清视频拍摄，帧速率升级到50i/60i以及24p/25P/30p，这使其不仅能够拍摄主体流畅的视频，还支持慢动作影片的拍摄。

整体设计：紧凑机身内置翻转屏

作为D5100的续作，尼康D5200的整体设计并没有太多改变，所以很多用户都无法分辨出两者的区别，不过从机身顶部新增的连拍模式按钮，还是可以看出D5200在操作上还是有一些改进。此外，在官方参数中还可以看到，尼康D5200的三围尺寸相比前作有一毫米左右的缩小，机身重量减轻5克左右，虽然与前作差别不大，但整体质感还是十分突出的。至于手感，对于手小的用户来说，手柄处可以轻松轻松容纳三根手指；不过对于一般用户，可能还是使用握住底盘的形式来把持相机，才会觉得更舒服一些，毕竟尼康D5200走得是紧凑型入门单反的路线。

尼康D5200的屏幕配置也没有什么变化，依旧使用了3英寸92万像素的液晶屏，特点在于支持170度的翻转，在一些特殊情况下使用还是要比取景器更方便，但稍落后于流行的部分便是没有提供触控操作。

相比D5100，D5200的用户界面部分进行了一定的更新，看起来更加现代和简洁。在机身顶部，你还可以看到一些按键设计，可以调节屏幕上的显示信息。另外按下机身背面的“i”按钮，会显示出一个总览信息界面，可以进行多达14项的拍摄功能调节。尼康D5200背面的导航键也拥有一些新的设计，按下中间的“OK”键，再通过滚轮来进行选择，这显然是一个更有效率的操作方法，让操作变得更加简单。

性能表现：ISO 3200可用 39点对焦速度较快

由于尼康D5200的APS-C画幅传感器上集成了2400万的像素，所以我们希望高像素能够带来更好的画面细节，同时噪点又会得到有效的控制。而事实证明，这款中低端数码单反相机的表现不错。当然，在高感光度下的画面细节肯定会略有损失，但通常是在可接受范围内的。尼康D5100提供了最大ISO 6400的本地最高感光度，我们则建议尽量使用ISO 3200或更低。在ISO 3200感光度时，过大的图像尺寸可能受到一些较暗中间色调的影响，所以不妨适当调低分辨率来获得更好的整体效果。

尼康D5200的2016万像素RGB矩阵测光系统，这是与较高端的D7100相同的配置，它在大多数情况下的表现是十分出色的，能够提供准确的曝光侦测，并不容易出现过度曝光的现象。那么在通常状况中你可以直接使用默认的曝光设定，但在诸如雪景等极端情况下，还是需要适当调节一下曝光补偿数值。

另外，之前的某些尼康产品存在屏幕颜色显示不准确的状况，在D5200上则没有出现，所以让用户可以更容易地通过屏幕来判断白平衡。在标准白平衡模式中，一般情况下可以还原准确和鲜艳的色彩，但在阴影环境下会略不准确，使画面看上去少了些生气。而通过自定义白平衡，其实是可以完美解决的，让颜色显得更温暖。我们也发现，在风景模式下，增强了蓝绿色调，让画面看上去有些不太真实；而黑白模式的效果则非常棒。由于图片控制模式可以同时拍摄RAW和JPEG图像，所以你可以同时获得一个黑白模式的JPEG照片和拥有全部颜色信息的RAW原片，这是一项非常人性化的功能。

对焦性能方面，尼康D5200使用了39个相位检测自动对焦点，整个取景范围基本上都被覆盖，不过画面边缘仍然是鞭长莫及。令人惊喜的是，我们发现对焦系统非常敏感，即使是使用18-55mm的标头来进行拍摄，也能带来非常快速且准确的对焦性能。不过，与其他主流的紧凑型数码单反相比，尼康D5200在实时取景模式中的对比度检测系统是较为缓慢的，所以不能被用于拍摄移动中的对象。当然如果使用三脚架，问题就解决了，实时取景仍然会是实用的功能。

最后在功能部分令我们略显惊讶的是，尼康D5200并没有增加任何新的特殊效果模式，与前作D5100是完全相同的，包括夜视、彩色素描、微型效果、可选颜色、剪影、高色调和低色调，这也是JPEG模式下仅有的特殊效果，新鲜感有些不足。虽然这些模式都与用户自身口味有关，但是从其偏入门级的定位来说，还是应该再增加一些更加有趣的新内容来吸引消费者。好消息是，得益于新的图像处理引擎，你在使用这些特殊效果拍摄时，取景更为流畅，而不会像前作那样经常发生卡顿现象。

图像质量和分辨率测试：低噪点表现但损失部分细节

作为画质测试的一个部分，我们拍摄了尼康D5200的画质与分辨率样张。在分辨率的测试中，我们会裁切画面中央100%的部分来进行评分，下面分别是JPEG和RAW的测试样张和得分。可以看到在JPEG模式下，在感光度上升至ISO 6400及以上时，尼康D5200的画质下降比较明显，相比取消了低通滤镜配置的D7100在每个ISO范围内大概要低了2-4分。不过在噪点控制方面，尼康D5200则是要比D7100更好一些。而在RAW原片模式下，两款机型的表现则不相上下。由此可见，尼康D5200和D7100在画面表现上采取了不同的风格，前者噪控更好，后者则更注重细节。

RAW无损输出：

噪点和动态范围测试：RAW模式整体素质高于JPEG模式

我们在严格控制的条件下使用尼康D5200拍摄了一个特别准备的图表，所产生的图像是使用DXO分析软件生成下面的数据分析图。其中，高信噪比（SNR）表示一个图像更干净、画质更好。另外，我们同时选择了尼康D5100、尼康D7000、宾得K30与佳能EOS 650D来与尼康D5200进行对比。

首先是JPEG图像信噪比测试，结果表现，尼康D5200的整体水平并不算是最差，也并非最好。在ISO 200的范围内，它要比自家的D7000、D5100和佳能EOS 650D都好一些，但逊色于宾得K30。提升至最常用的ISO 400至3200的范围后，尼康D5200的信噪比大幅降低，只比最低端的佳能EOS 650D稍好，落后于其他对比机型。不过在ISO 6400及以上时，成绩有所回升，领先于宾得K30和佳能EOS 650D，但不及D5100和D7000。

转为RAW原片输出后，我们再来看看尼康D5200的信噪比表现。这次它的曲线升降幅度似乎略小于JPEG输出，在ISO 200以内时与D7000、D5100差别不大，不过在ISO 400至6400范围内的表现更稳定，略胜于自家的两款其他机型。而在ISO 6400至ISO 12800之间的成绩，甚至高于宾得K30，仅次于佳能EOS 650D位列第二。所以整体来说，尼康D5200在原片输出时有更好的噪点控制功能。

接下来是动态范围的对比，首先为JPEG输出模式。尼康D5200在ISO 1600的范围以内，均拥有参测机型中的最好表现，令人印象深刻；不过随着感光度的进一步提升，成绩则大幅下降，仅在ISO 接近12800时略有回升，整体高感动态范围不及D7000好D5100。

最后来到RAW输出的动态范围测试环节。在这里，尼康D5200的动态范围表现是十分令人印象深刻的，在整个感光度范围内击败了宾得K-30、尼康D5100、佳能EOS 650D和尼康D7000，仅在ISO 25600后有非常轻微下降，动态范围表现十分出色。

样张赏析

这是使用相当于ISO 25600的最高感光度扩展模式拍摄，整体看起来不错，但是当你放大局部观看时，会发现较为明显的噪点。

评测总结：高感表现不错的入门单反 功能升级有限

通过以上评测内容可以看出，尼康D5200基本上是前作的像素升级小改款，就像D7100之于D7000一样，没有带来大幅的功能和性能提升，是令人略感失望的。我们喜欢它的部分是：将前作1600万像素的传感器提升至2400万像素，能够获得更多的细节，并且在高感光度下（尤其是RAW）有着不错的画质表现，尤其是相比更高端的D7100来说。另外，翻转屏幕的设计尤其适合入门者使用，可以在拍摄风景、微距时发挥更大的作用。以上这些方面，是我们感觉尼康D5200作为一款小型化的中低端入门单反吸引人的部分。

而令我们失望的部分是，尼康D5200除了传感器的升级之外，并没有带来太多的新功能，甚至内置的滤镜都没有增加，令人感觉有些诚意不足。另外，触控屏、WIFI这些吸引人的新元素也都没有出现，相比目前流行的设备，尼康D5200在操作和传输性上显然有些落伍。

总而言之，尼康D5200是一款不错的中低端入门单反，拥有不错的噪控能力和细节不俗的画质，并且小巧的机身和数量不多的按键非常适合初学者。不过，如果你已经拥有了D5100或是类似定位的机型，在这里就不建议购买尼康D5200了。

优点：

· 升级为2400万像素传感器

· 高速自动对焦功能

· 可翻转的屏幕设计

· 良好的用户界面

缺点：

· 特殊效果仅针对JPEG模式

· 没有触控屏

· 操控性提升有限

来源：techradar

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"订货（order）是买方为要求卖方供应具体数量的货物而提出的一种要求。此时，交易双方之间的陌生感已消除，可以说已经度过了接触障碍和难关。　　写定货信时应注意以下几点：　　（1）开头就直接说明订购的意图。常用的句式有 Please ship..., Please send..., We would like to order..., We would like to purchase..., 等等，明确说明你要购买。　　（2）订货信应包括你要购买的商品的详细情况， 包括商品的名称、品质、数量、包装、价格条件、支付条件、装运方式以及需要对方提供的单据等。 （3）内容必须准确、清楚。不论是商品的价格还是商品的规格都应做到准确无误，否则会带来不必要的损失与麻烦。下面是一篇日常订货信的例文，请大家体会一下。　　Dear SirsPlease send us your Milky White Chocolate Mints,, 12-ounce packages, 24 packs per case, catalog No. 15c-123, at the price of US$10.59 per case and fifteen cases of Milky White Chocolate Bars, 6-ounce bars,, 24 bars per case, catalog No. 18c-256, at the price of US$15.89 per case.Please mail these items by air freight as we need them by 20th August and charge the amount to our Account No. 018325585.If it is convenient, please include with the delivery a few samples of your new chocolates products, as you did with the past three years' orders. The samples help convince our customers to buy your delicious products.Yours faithfully"