Quick Reply... the best lens for great Bokeh.... Nikon AF DC-NIKKOR 135mm f/2D Lens
I have never seen a more beautiful Bokeh than the Nikon 135mm F/2 DC lens.... just wow.
R
http://www.kenrockwell.com/nikon/135mm-f2-dc.htm...The Nikon AF 135mm f/2 DC is Nikon's, and arguably the world's, greatest portrait lens. It has a very similar smaller brother, the 105mm f/2 DC.
The 135mm DC is also Nikon's sharpest 135mm lens, and an extraordinarily great lens for nature and landscape photography. It is worlds sharper and freer from spherical aberration than any of the the old manual focus 135mm f/2 lenses.
The hood is the best built-in hood I've ever used. It is metal, and it locks into position so it doesn't shrivel down like most other built-in hoods.
You have to move a ring to get to manual focus mode, and once you do, manual focus is fantastic.
Defocus Control
DC stands for Defocus Control. A lot got lost in the translation on the way from Japan. The key word is control, not defocus. This is not a soft-focus lens; it is a lens that has been specifically designed and patented both for superior bokeh (the softness of out-of-focus areas), and the ability to control this bokeh for optimum results under all conditions...
How do you set this 135mm lens for optimum bokeh? Easy: set this ring to the same aperture at which you're shooting. Press the unlock button on the left in order to move it, otherwise it stays locked. Set it to the R side to make backgrounds go soft and disappear, or the F side if you want to optimize it for junk in the foreground.
Hint: You should almost never have out-of-focus objects in front of your subject or in the foreground. It looks unnatural and weird. Our eyes naturally focus on the closest thing to us, so it's uncomfortable when a photo has a soft foreground or other distractions which our eyes can't bring into focus.
The effects of this defocus control are very subtle. You won't see it through your viewfinder. When used properly, the 135 DC turns backgrounds into the softest, smoothest washes of color you've ever seen. Turn the ring in the wrong direction, and out-of-focus backgrounds get harsher. These are subtle effects. Computer people may not see these subtleties at all, but artists will.
Leave the Defocus Image Control ring at zero, and the 135 DC simply acts as the sharpest 135mm lens you've ever used.
The defocus control only controls defocus, or the parts of the image that are not in focus.
If you set the control beyond the aperture you're using, like set to f/5.6 when shooting at f/2, you can get a softer focus effect.
The in-focus part of the image is always ultra sharp. This is not a soft-focus lens. It's only the unfocused parts of the image which are made softer. No one in the USA understands this lost-in-translation subtlety, and mistakenly thinks this is a soft focus lens. That's why this lens isn't popular in the USA.
The 135 DC has a control for all of this. This is why Nikon has the patent on it. You can adjust the lens from normal to super bokeh to soft focus if you push it too far. You'll notice that dedicated soft-focus lenses have no separate defocus control; they are fixed one way and the only control you have is your shooting aperture.
This lens is so unique that Nikon will probably discontinue it just around the time people start figuring out what it does, and then the used price will skyrocket to $4,000, just like it did with the 28mm f/1.4, for exactly the same reason..... (see link for entire article).
All you would want to know about Bokeh except ... get the lens I mentioned above...
https://en.wikipedia.org/wiki/Bokeh