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diffusionless wrote:
前面網友就是問明明結構都一樣，為何MTF不一樣，而且請記住這個是一顆F1.2光圈的鏡頭，他的球差可不是F2.8或F2可以相提並論。
这个佳能官方刚发布DS镜头的时候就说了，靠的是镀膜改变
https://www.usa.canon.com/internet/portal/us/home/learn/education/topics/article/2019/may/Two-Powerful-Canon-Portrait-Lenses-RF-85mm-F12-L-USM-vs-the-RF-86mm-F12-L-USM-DS/Two-Powerful-Canon-Portrait-Lenses-RF-85mm-F12-L-USM-vs-the-RF-86mm-F12-L-USM-DS
Defocus Smoothing is a coating technology, similar in some ways to the general concept of apodization technology, which has been a part of optical design in the lens industry for some time. In the case of the RF 85mm F1.2 L DS lens, a special optical coating is added to two lens elements, which progressively smooths the edges of out-of-focus areas (compared to the RF 85mm F1.2 L without DS technology). Simply stated, the DS lens gives even smoother “bokeh” and rendering of out-of-focus highlights, particularly when it’s used at or near its maximum f/1.2 aperture. The edges of out-of-focus highlights with the DS lens, in particular, are smoother — this is the biggest difference between these two 85mm f/1.2 lenses.
Because DS coating is indeed a coating technology, it does not rely on added optical elements or “soft focus” optics to achieve its results. Accordingly, the DS lens’ size and weight are essentially the same as with the RF 85mm F1.2 L USM lens, along with its outer appearance, and basic optical performance. The DS lens uses the same general optical design as the conventional RF 85mm F1.2 L; the major distinction are the Defocus Smoothing coatings used on two lens elements.
球差还是那个非DS版本镜头的球差，镀膜相当于塞了个渐变滤镜
与stf的区别是stf可以做成双叶片设计切换stf效果（sony的e口stf没有保留这个设计，比较可惜），并且stf还做大了像场保证边角光斑。
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airdon2000 wrote:
我的理解不知道有沒有...(恕刪)
你講的應該是這個
https://youtu.be/SttD4F4_0Cw
