Originally posted by EricT Remember that due to the crop factor, the 8.5mm f/1.9 behaves roughly like 50mm f/11 on full frame in terms of DOF. Therefore, you will struggle to get nice bokeh with this camera.
That's pretty much what I was going to say - the sensor it too small for you to have any meaningful control over depth of field - whatever aperture you choose, there will be lots of it.
As for the human eye not having 'bokeh' (gosh I hate that term and all it implies) - mine do. When I'm looking at my laptop, the rest of the world in my peripheral vision above the screen is blurred. If you hold a book up near my face when I'm looking at the horizon, it takes a split second for my eyes to focus. I mean, it's quicker than a Pentax (but then what isn't?) and - believe it or not - quicker than a Nikon or Canon - but it's still a perceptible change.
Sure, I have quite a big depth of field, but then I have an angle of view of about 180 degrees. Big DoF is what you get with a wide angle