ahsanford said:geekpower said:actually, the quality of the bokeh has little to do with the 1/3 stop wider aperture, and even less do to with magic; it's all about the spherical aberration, which turns out is actually science:
http://toothwalker.org/optics/spherical.html
we can talk about SA being a "defect" of the lens because it makes the image softer, overall, but it is qualitatively different than what a simple blur in post can do, as it becomes gradually more pronounced at the edges, which helps to pull attention to the subject. perhaps a more advanced post process could do something similar, but a simple one certainly can't. in addition, if the photographer decides to intentionally front or back focus, it can make the bokeh look different, so there is a lot of room for creativity.
Point taken -- the weird love of the f/1.2L is more than just a fraction of a stop. Its nutty spherical plane of focus is somewhat unique: some folks describe how it renders as 'magical' while others just call it soft.
It would appear that there are two camps with 50 primes -- give me magic or give me sharpness. The former spoons with their 50L at night while the latter straps enormous pickle jars to their rigs (Sigma Art, Zeiss Otus) to get razor sharp images.
I'm in a clear minority compared to those two groups. I care less about bokeh and best possible sharpness. I want a lens that is 90% as good as the best lens is optically, but only half as big. I love love love the 35mm f/2 IS USM and just want something similar (I'll take f/1.4 if it's not enormous) at the 50mm focal length.
- A
Well I wish they could make one with 90% of both, a very smooth bokeh and very sharp on the subject, I know it's near impossible and if not then very expensive, which means I can't afford it, but I want it to be there in the case I can afford it.
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