@Jerome Thanks for the explanation! I believe what you’re describing are the factors that determine depth of field in general, but I appreciate your point that, the shallower the depth of field, the more we will see ovals. What I’m interested to see is, all other things being equal (focal distance, focal length, and aperture), how does the bokeh compare between the 1.5x and the 1.75x? In other words, how do the two lenses draw differently? Any chance we could see a comparison? Thanks!