佳能EOS R3和佳能EOS R5对比

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Published Sep 29, 2021 | Richard Butler 中文为机器提供
Introduction

The EOS R3 is Canon's highest-end mirrorless camera yet, but it arrives into a range of already capable cameras. The EOS R5 impressed us a great deal, proving itself a worthy successor to the classic EOS 5D DSLRs, so what does the R3 do that's different, and is it worth the extra money?

The all-around capability of the R5 and the branding of the R3 mean it's not quite as clear-cut as the distinction that existed between the 1D and 5D models. But it still essentially comes down to what you want to use the camera for. Let's take a closer look at the two cameras' respective strengths.

介绍

EOS R3 是佳能迄今为止最高端的无反光镜相机，但它已进入一系列功能强大的相机。EOS R5 给我们留下了深刻的印象，证明自己是经典 EOS 5D 数码单反相机的有价值的继任者，那么 R3 有什么不同之处，值得多花钱吗？

R5 的全面能力和 R3 的品牌意味着它不像 1D 和 5D 模型之间存在的区别那么明确。但它本质上仍然归结为您想将相机用于什么目的。让我们仔细看看这两款相机各自的优势。

Sensors

We wouldn't usually start a comparison by talking about sensors, but the difference in chip technology between these two cameras is at the heart of most of the other differences between them.

The EOS R5 uses a front-side illuminated CMOS sensor. It performs very well, both in terms of image quality and speed. But using electronic shutter drops to 12-bit mode and still takes around 1/60th of a second to read out the whole sensor, which means no use of flash in e-shutter mode and a risk of moving subjects appearing distorted if they move too much during that 1/60th of a second.

The EOS R3 jumps two generations ahead: skipping conventional BSI fabrication and moving on to a Stacked CMOS that allows much faster readout. The R3's electronic shutter takes around 1/200th of a second to read: approximately 1/3rd as much time. This means flashes can sync at up to 1/180 sec in e-shutter mode and it's much less likely that you'll see any rolling shutter effect. It's only a fraction slower than most mechanical shutters, which typically take around 1/250 sec to traverse the sensor.

This speed difference plays a role in several of the cameras' features, but the most fundamental is that the R3's e-shutter mode can be used for almost all photography, whereas the R5's is more limited.

传感器

我们通常不会通过谈论传感器来开始比较，但这两款相机之间芯片技术的差异是它们之间大多数其他差异的核心。

EOS R5 使用前照式 CMOS 传感器。它在图像质量和速度方面都表现出色。但是使用电子快门会降到 12 位模式，并且仍然需要大约 1/60 秒来读取整个传感器，这意味着在电子快门模式下不使用闪光灯，并且如果移动的对象太移动，则有可能会出现扭曲的风险在那 1/60 秒内。

EOS R3 领先两代：跳过传统的 BSI 制造，转向堆叠式 CMOS，可实现更快的读取。R3 的电子快门大约需要 1/200 秒来读取：大约是时间的 1/3。这意味着闪光灯在电子快门模式下最多可以同步 1/180 秒，而且您不太可能看到任何滚动快门效果。它只比大多数机械快门慢一点，后者通常需要大约 1/250 秒才能穿过传感器。

这种速度差异在几款相机的功能中发挥着作用，但最根本的是 R3 的电子快门模式几乎可以用于所有摄影，而 R5 的限制更多。

Shooting speed
The faster burst rate of the EOS R3 puts it more in line with Canon's 1D series of pro sports DSLRsThe difference in readout speed makes a fundamental difference to the circumstances in which you can use the electronic shutter that underpins both camera's fastest modes. So, while it may appear that the R5 can shoot at 20 fps to the R3's 30, in many circumstances it's not advisable to use e-shutter mode.The difference is that the R3's super-fast readout means e-shutter can be used for shooting even fast-moving subjects at its full 30 frames per second, but the R5 would need to be switched to its 12 fps mechanical shutter mode.It depends on your tolerance for rolling shutter distortion, of course, and there are scenarios in which capturing the perfect moment but with a slightly elongated subject is good enough. But this isn't likely to be the case for anybody being paid to capture sports photos, and hence the R3 will significantly outperform the R5 for shooting action.
拍摄速度
EOS R3 更快的连拍率使其更符合佳能的 1D 系列专业运动数码单反相机读出速度的差异对您可以使用支持两种相机最快模式的电子快门的情况产生根本性的影响。因此，虽然看起来 R5 可以以 20 fps 的速度拍摄到 R3 的 30 fps，但在许多情况下，不建议使用电子快门模式。不同之处在于 R3 的超快读取意味着电子快门可以用于以每秒 30 帧的速度拍摄快速移动的对象，但 R5 需要切换到 12 fps 的机械快门模式。当然，这取决于您对卷帘快门失真的容忍度，并且在某些情况下，捕捉完美时刻但拍摄对象略微拉长就足够了。但是对于任何付费拍摄体育照片的人来说，情况不太可能如此，因此 R3 在拍摄动作方面将明显优于 R5。
Resolution

Just as with the 1D / 5D relationship, if you're looking for a high-res landscape or studio camera, it's the smaller camera that's a better bet.

The 45MP FSI CMOS chip in the EOS R5 delivers the goods in terms of resolution, and its dynamic range is solid, too. We say solid because, although it measures very much like Sony's a7R IV, there seems to be a little detail smearing noise reduction going on in the shadows of low ISO Raw files to help make the numbers look good.

We've not been able to see if anything similar is happening with the R3, but its 24MP sensor is not going to match the R5 in situations in which detail capture is critical.

解析度

就像 1D / 5D 的关系一样，如果您正在寻找高分辨率风景或工作室相机，那么较小的相机是更好的选择。

EOS R5中的45MP FSI CMOS芯片在分辨率方面表现出色，动态范围也很稳定。我们之所以说稳定，是因为虽然它的测量结果与索尼的 a7R IV非常相似，但在低 ISO 原始文件的阴影中似乎有一些细节涂抹降噪，以帮助使数字看起来不错。

我们无法看到 R3 是否发生了类似的事情，但是在细节捕获至关重要的情况下，它的 24MP 传感器将无法与 R5 匹配。

Video spec
The EOS R5's higher resolution sensor gives it an edge in terms of video, too. It can shoot 8K footage at up to 30p, which the R3 simply hasn't got enough pixels to keep up with. However, 8K is overkill for a lot of applications; mainly providing scope for cropping or downsampling, to give more detail than native 4K capture can achieve.
And it is in this second regard that the R3 starts to close the gap a little. It can't quite match the detail levels of the R5's 4K-from-8K, but its 4K footage at 60 fps or slower is all taken from the full 6K width of its sensor (in DCI mode, anyway*). So you can get 1.5x oversampled 4K footage at up to 60p, which the R5 can't do. The R3 also has connectors in its hot shoe that allow the attachment of an external XLR mic adapter.
Then, of course, there's the consideration of heat build-up. Both cameras have thermal limits in their more demanding video modes, but Canon says there's no particular restriction on 4K (from 6K) shooting at up to 30p, whereas the R5's oversampled 4K shooting duration is limited and gets cut into by any prior use of the camera. Overall, the R3, with its larger battery, is likely to be the more usable video tool.
*16:9, UHD 4K comes from a 5.6K region, cropped in at the edges.
视频规格
EOS R5 的高分辨率传感器也使其在视频方面具有优势。它可以拍摄高达 30p 的 8K 素材，而 R3 根本没有足够的像素来跟上。然而，8K 对于很多应用程序来说是过大的。主要提供裁剪或下采样的范围，以提供比原生 4K 捕获更多的细节。
正是在第二个方面，R3 开始缩小差距。它无法完全匹配 R5 的 4K-from-8K 的细节水平，但其 60 fps 或更慢的 4K 素材全部取自其传感器的完整 6K 宽度（无论如何在 DCI 模式下*）。因此，您可以获得高达 60p 的 1.5 倍过采样 4K 素材，这是 R5 无法做到的。R3 的热靴中还有连接器，可以连接外部 XLR 麦克风适配器。
然后，当然，还有热量积聚的考虑。这两款相机在其更苛刻的视频模式下都有热限制，但佳能表示对高达 30p 的 4K（从 6K）拍摄没有特别限制，而 R5 的过采样 4K 拍摄持续时间是有限的，并且会因之前使用相机。总体而言，R3 拥有更大的电池，可能是更实用的视频工具。
*16:9，UHD 4K 来自 5.6K 区域，边缘被裁剪。


来源：DPREVIEW内容还很多 有兴的。。。

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