I took this shot a few months ago, and something has been bugging me ever since. I was a bit surprised when I saw the image and saw the conspicuous "bokeh orbs". The thing is, I hadn't noticed anything of the sort when looking through the viewfinder. I hadn't noticed any particular highlights on the glass, and certainly didn't see such noticeable discs of light as you can see in the final image. They must have been there to a degree, but I certainly didn't expect the shot to turn out like it did.
I've been wondering why that is. I've searched for answers, and come up with a few possibilities of my own:
the microprism filters the light such that a narrower beam of light is focused through the viewfinder, so you see more DOF than what goes through the shutter
something to do with the human eye, in that your iris may provide more depth of field - your eye further focuses the light, certainly might be interpreted differently than light hitting a flat sensor
the brightness and contrast of the final image may not match what was seen through the viewfinder. The room was fairly dark and the shot was at 1/60th second, so possibly the bokeh is brighter in the final image than I would have seen through the viewfinder. Maybe it was there, just not as prominent?
I am imagining the whole thing, they were there all the time I just wasn't paying attention
Is it a combination of all of these (particularly the last one)?