我有生以来最喜爱的变焦镜头之一就是索尼20-70mm f/4。仅凭一支兼具广角至中长焦覆盖的万用镜头，就能为你的摄影装备增添诸多便利。我也并不介意那款中等光圈的f/4，而且正因如此，它的体积和重量都控制得相当小巧。因此，当佳能随R6 Mark II一同推出一支20‑50mm f/4 L变焦镜头时，我便迫不及待地想试一试。这款镜头因其混合照片和视频设计而倍加迷人，应该为每个人提供一些东西。

Buy the Canon RF 20-50mm f/4 L IS USM PZ new on B&HBuy the Canon RF 20-50mm f/4 L IS USM PZ used on KEH.com
A black Canon 20-50mm camera lens with red accent, shown upright on a dark surface with white tiled background. The lens has visible focus and zoom rings, and switches for stabilizer and autofocus.
这是我玩过的最小的L系列镜头之一。

然而，镜头还没有完全准备好进行全面测试，我们收到的版本是预生产镜头，所以我可以报告的是有限的。尽管如此，我还是渴望了解这种镜头的工作方式，并且在现场使用这种新型光学器件可以得出一些明确的结果。

A person with gray hair and a checkered shirt stands on a city sidewalk, holding a camera up to their face and taking a photo. Cars are passing by on the street in the background.
为什么不用这么紧凑和方便的镜头做一点街头摄影呢？
Close-up of a Canon camera lens showing the brand name, focal length numbers (20-50mm), and switches for image stabilizer and autofocus/manual focus, with a blurred white tiled background.
我喜欢在通用变焦镜头上拥有20毫米广角的纯粹便利性。

佳能RF 20-50毫米f/4 L PZ: 比预期的要小

20-50毫米相当紧凑，前端有67毫米过滤器安装座，重量仅为14.8盎司 (420克)。不过，请不要误会，因为该镜头是专业的L系列镜头，并且对元件完全密封。它也有大量的控制，可以定制。

A camera lens lies face down on a black surface with its rear element and electronic contacts visible; the lens cap rests nearby. The background is a white subway tile wall.
这是一个L系列镜头，所以它是建立在一个严格的标准。

镜筒前部有一个可定制的控制环，其下方有一个光滑的手动对焦环。您可以使用AF/MF开关设置对焦，并且镜头内置了光学图像稳定器。镜头中有三个Nano USM电机，用于驱动对焦和电动变焦功能，我发现对焦迅速而无声。您还可以找到一个开关，以一种有趣的方式控制power zoom功能，它非常整洁，值得拥有自己的部分。

Close-up of a camera lens showing zoom markings, an AF/MF focus mode switch, and a stabilizer on/off switch. The lens has a ribbed grip and a visible red alignment dot.
这个镜头有你希望的所有控制。

您如何使电动变焦镜头适用于视频和照片射击游戏？佳能已经找到了一个变焦环，它可以经典地操作，但也可以点击到一个提供宽/远距变焦摇杆的范围内。当环处于手动操作状态时，它看起来就像任何其他变焦环一样，但是变焦是由电机而不是机械耦合器驱动的，并且在功能上有轻微的延迟。我很快就习惯了这一点，并在很短的时间后完全没有注意到它。

Close-up of a camera lens showing a textured focus ring, a large circular button, and a switch labeled "PZ/MZ" with a directional arrow. The lens is black with metallic accents.
使用此开关可以在照片镜头变焦或视频风格变焦摇杆之间巧妙切换。

当镜头设置为动力变焦操作时，变焦环变成短距摇杆，可以以预先可调的速度缓慢变焦镜头。如果相机机身也恰好具有变焦摇杆，则可以将每个摇杆自定义为不同的速度，以实现最大的多功能性。我喜欢这种双系统的工作方式，我特别喜欢摄影师仍然可以使用经典的变焦环，只有稍微不同的感觉来处理。总的来说，这是一个聪明的设计。

A Canon RF 20-50mm f/4 L lens resting on its side on a dark marble surface, with a white tiled wall in the background. The lens features a red ring near the front element.
f/4光圈保持紧凑，光学元件的性能与专业镜头一样。

佳能RF 20-50毫米f/4 L PZ: 第一印象

如果无法拍摄测试图表或报告LoCA (纵向色差) 或raw文件中的耀斑，我只能根据JPEG图像显示的内容提出建议。但是，我相信镜头会非常清晰。默认情况下，现代镜头-尤其是L系列镜头-往往具有出色的清晰度。Bokeh看起来相当流畅，但我想在以后的日子里像素窥视。

A weathered sign for Tim's Food Store, featuring a 7UP logo, hangs on a building with yellow siding as sunlight creates a starburst effect in the sky.
耀斑控制得很好，有一些轻微的重影。太阳也很好。

A street view of an old residential house next to a small convenience store with a 7-Eleven sign. A church with a pointed steeple rises in the background under a partly cloudy sky.

A colorful mural of a woman's face with blue eyes and blue shapes around her is painted on the side of a building, set against a bright blue sky with scattered white clouds.

我确实向明亮的光源拍摄了一些照片，恰好在各种光圈范围内这样做。结果似乎显示出相当好的抗耀斑性，在更紧密的孔径处存在一些光学重影。太阳星不是我见过的最好的，但那里有一些戏剧性的东西，我可以看到自己经常使用这个镜头拍摄日落风景和阳光明媚的建筑镜头。

A brick building with several windows is viewed from a low angle against a blue sky. Leafless tree branches frame the top of the image, casting shadows on the building’s walls.
我喜欢广角范围的建筑和夸张的构图。

A nearly empty parking lot with a curved, diagonal yellow grid line painted on the asphalt, and the shadow of a streetlamp stretching across the pavement.

A man carrying folders walks through a parking lot in front of a large, detailed mural painted on a dark building wall under a partly cloudy sky.

这款镜头绝对是为电影工作而设计的，由于其超宽范围和紧凑的设计，它将成为一个优秀的万向节或vlogging镜头。佳能向我们介绍了近焦矫正和呼吸特征，因此我们认为可以确认这些陈述。镜头在技术上不是齐焦的，这意味着变焦镜头会稍微移动焦点。但是，它非常小且非常接近，以至于相机的自动对焦很容易解决差异。

White paint splattered on the corner of two intersecting brick walls above a grated metal floor, shown in black and white. The paint streaks diagonally across the wall, creating an abstract pattern.
这是一个方便的镜头旅行或漫步。

Two people wait at a bus stop in front of a brick building with an "Arada Bar & Restaurant" sign. One person stands near the curb; the other sits on a bench next to a trash can. The street is empty.

A black and white photo of a weathered concrete curb with worn, barely readable engraved text. Dry grass and twigs cover the ground beside the curb, with sunlight casting shadows across the scene.

这个镜头也非常好地纠正了呼吸问题。如果你从近到远聚焦这个镜头，镜头的视野几乎不会移动。基本上，这个镜头将是理想的拉动焦点从一个主题到另一个，或做一个平滑的权力变焦中间拍摄没有分心的变化。这可能是全画幅佳能相机上摄像师最喜欢的新镜头。

Close-up of vibrant red and white flowers with soft green leaves, set against a blurred background, highlighting the delicate petals and natural beauty.
特写能力没什么了不起的。

A narrow alley with colorful, geometric mural featuring orange circles on a tiled wall, next to a plain tan building; a tall apartment building is visible in the background under a blue sky.

A close-up of a green recycling bin in front of a green wooden garage door with white trim. Tree branches cast detailed shadows on the door in bright sunlight.

在我们可以进行全面测试之前，我通常不喜欢玩镜头，但这一次，我觉得我仍然可以很好地了解它的功能。佳能制作了一个镜头，可以取悦想要与他们正在制作的视频内容一起拍照的混合射击者。地狱，即使是专门的摄影师可能会发现这个镜头是一个完美的旅行和风景伴侣。

A sign reads “EXIT” above another sign stating “NO SKATEBOARDING, NO PANHANDLING, NO LOITERING.” Trees, buildings, and a person walking on a sidewalk are visible in the background.
自动对焦是快速和安静。完美的剧照和视频。

Black and white photo of a street scene with a large 7UP sign reading “Tim’s Food Store” on a building. The sun shines brightly above, and two people walk on the sidewalk in the distance.

A weathered blue wooden shed with a white trim stands beside a tall, orange-brown wooden fence. Grass grows at the base, and a blue house with a balcony is visible in the background.

我会考虑把它和一个70-200毫米f/4结合起来，然后带着它去冒险。两个镜头几乎可以覆盖我想捕捉的任何东西。作为一名更敬业的摄影师，我仍然更喜欢索尼20-70毫米f/4作为通用摄影镜头的多功能性，但如果你想要一个类似范围和一整套视频优势的东西，这款最新的L系列镜头为非常有用的变焦带来了20毫米的覆盖范围。

Buy the Canon RF 20-50mm f/4 L IS USM PZ new on B&HBuy the Canon RF 20-50mm f/4 L IS USM PZ used on KEH.com
A person wearing a checkered shirt is taking a photo with a camera in a parking lot. A sign in the foreground reads, "Unauthorized vehicles will be ticketed or towed." Trees and buildings are visible in the background.
如果你想要一个摄影师和摄像师都可以享受的镜头，不要再看了。

A person lies on a bench next to a trash can outside the Arada Bar & Restaurant, which has a large black awning, against a brick wall on an empty sidewalk.