with a better DOF and mooooore bokeh.
Unfortuately, bokeh is not something that comes in variable quantities. Bokeh is a subjective quality related to the characteristics of shape and form of objects in a blurred background. There are actually 2 types of bokeh, regular bokeh and Hollywood bokeh.
Bokeh is almost entirely controlled by the number and shape of the aperture blades in a lens.
Here are some excerpts from Wikipedia on 'Bokeh'
Bokeh characteristics may be quantified by examining the image's
circle of confusion. In out-of-focus areas, each point of light becomes an image of the aperture, generally a more or less round disc. Depending how a lens is corrected for
spherical aberration, the disc may be uniformly illuminated, brighter near the edge, or brighter near the center. Lenses that are poorly corrected for spherical aberration will show one kind of disc for out-of-focus points in front of the plane of focus, and a different kind for points behind. This may actually be desirable, as blur circles that are dimmer near the edges produce less-defined shapes which blend smoothly with the surrounding image. Lens manufacturers including
Nikon,
Canon, and
Minolta make lenses designed with specific controls to change the rendering of the out-of-focus areas.
The shape of the aperture has a great influence on the subjective quality of bokeh. When a lens is stopped down to something other than its maximum
aperture size (minimum
f-number), out-of-focus points are blurred into the
polygonal shape of the aperture rather than perfect circles. This is most apparent when a lens produces undesirable, hard-edged bokeh, therefore some lenses have aperture blades with curved edges to make the aperture more closely approximate a circle rather than a polygon. Lens designers can also increase the number of blades to achieve the same effect. Traditional "Portrait" lenses, such as the "fast" 85mm focal length models for 35mm cameras often feature almost circular aperture diaphragms, as is the case with
Canon's EF 85mm f/1.2L II lens and
Nikon's 85mm f/1.4D, and are generally considered exceptional performers. A
catadioptric telephoto lens displays bokehs resembling doughnuts, because its
secondary mirror blocks the central part of the aperture opening. Recently, photographers have found how to exploit the shape of the bokehs by creating a simple mask out of card with the shape that the photographer wishes the bokeh to be, and placing it over the lens. Common shapes are stars and hearts, but it is possible to create it with almost any shape imagined.
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