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Lars Johnsson wrote:
Floating elements is the cure for focus shift. But it often make the bokeh less smooth/nice
I have heard the same thing about aspherical elements, but I have my doubts that either floating elements or aspherical elements necessarily lead to worse bokeh. Take for example the Canon 85L (any of them the nFD, or either of the AF Marks). It has a floating element and an aspherical element, but in my view has nice bokeh. Or consider the Pentax 31 limited. It has a floating element and an aspherical element and it has quite nice bokeh in my view as well. I also suspect that the new Zeiss 35mm f/1.4 that has a floating element and an aspherical element will have very nice bokeh (the few samples I have seen on Lloyd Chambers site seem to suggest this). And there are lots of great bokeh lenses with floating elements and no aspherical elements (the Zeiss anniversary lenses, the Pentax 77 limited, the OM 90 f/2, the Leica 100mm f/2.8 APO, the Zeiss 50mm MP, the Minolta MD 28mm f/2, etc.). Bokeh seems to be hard to predict and, IMO, there is very little one can say generally about it except that unless ones uses a lens in a lot of situations or looks at a lot of pictures from a lot of situations it is hard to get a sense of how good the bokeh is for a lens.