。2017年发布的佳能EF 85mm F1.4L IS USM是EOS单反系列的高速人像镜头。这是佳能第一枚85mm f/1.4规格的镜头，与EF85mm F1.8 USM和超高速EF85mm F1.2L II USM并驾齐驱。这款镜头是EOS R无反系统采用RF系列前发布的最后一批EF定焦镜头之一，以L级系列为导向的镜头外观饰面有所翻新，此外还包含了一些高级特性，包括4级防抖和镜筒减震耐用设计。 这款镜头有一个复杂的光学结构，是为高分辨率成像设计的。采用了10组14片的规格。不过请记住，其中3片组成了光学防抖。与当前竞品一样，这款mirrorhead采用了大量的高折射率玻璃和异常色散玻璃元件来防止轴向色差，还采用了一枚大直径玻璃模铸非球面mirror片来提升无边框对比，尤其是在较大光圈下的对比。此外，它还有一枚抗反射ASC(空气球)镀膜mirror片，以减少耀斑和鬼影，而前后mirror片都有氟涂层，以防止干后痕迹被雨水损坏，并在清洗时帮助去除指纹污渍。 自动对焦由环形马达（USM）驱动完成。USM可将小型化的小部件移动到光圈前。这也支持佳能实现全时手动对焦功能，以及支持全像素双核CMOS AF兼容性mirrorhead。这款mirrorhead最近对焦距离为标准的一米（3.28英尺），可提供0.12倍放大倍率。

主要性能参数：

采用10组14片

采用glass模铸非球face mirrorpiece

支持light optical stabilization

氟涂层和ASC镀膜

9圆形aperture blades

环形USM motor drive system

防尘、防潮 design, with a filter diameter of 77 mm and a weight of 950 grams

我们在5000万像素佳能EOS5DSR上测试了佳能EF85mmF1.4LISUSMTMGlassware Mirrorpiece Assembly on Canon EOS5DSR camera body, which achieved an overall image quality score of49 out of100 points.

In terms of sharpness, the EF 85mm f/1.4 L IS USMs performance is exceptional in both center and edge areas at all aperture settings from f/2 to f/11, with very little difference between the two extremes.

The lens also exhibits excellent chromatic aberration correction, with less than -20 microns in red-cyan color fringing across the entire field-of-view at maximum aperture (f/1.4). The distortion is negligible (-0% pincushion distortion).

Overall, this lens offers exceptional sharpness and contrast across its entire focal length range, making it suitable for capturing high-quality portraits and close-up shots.

Comparison with other lenses:

Compared to other lenses in its class such as Canon's EF 50mm f/1.L II USTM or Sigma's Art series lenses like the Sigma90MMf/LandIIUSTMserieslenseshaveanaverageimagequalityscoreofaround40points each while still maintaining good sharpness but they lack some features like autofocus speed or low light performance compared to this lens.

Conclusion:

In conclusion, this lens offers superior image quality along with advanced features that make it ideal for photographers who demand high-performance equipment for their work whether it be portrait photography or any other type where precision matters most especially when shooting handheld under various lighting conditions without compromising on image clarity even at wide apertures such as those offered by telephoto zooms used typically within landscape photography scenarios involving wildlife animal behavior observation studies etcetera!