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I've been learning about how bokeh and diffraction spikes are created by the various hardware & settings your lens has and can do. I was testing out a lens using some extension tubes and back-lit glitter dust just to see what it would do. With this lens I notice a few things. The foreground looks like typical orb-shaped bokeh, but the background looks like diffraction spikes; both are outside the DOF of course. In photos of bright points of light, like a street light that is within the DOF, the light turns into a big round bokeh diffraction "spike". It makes it so that the in-focus lights look out of focus. This is very apparent in long nighttime exposures in cities. Things outside the DOF in the background have a hazy milky appearance, but the foreground doesn't. Basically, the foreground has better contrast and sharpness than the background.
Is there a term for the difference in way the foreground and background outside the DOF are so different in how they are out of focus? I've been trying to research this, but I'm not finding anything specific enough to help me gain more understanding about it.
>example pics
