Bokeh example ... holiday lights
Okay ... this may be a little extreme, but it will offer a comparison idea for Bokeh at various apertures.
I used an AF 50mm f/1.4 ... and in manual focus (MF), I set if for OOF operation at about four feet from the tree. You will note, using ONLY the aperture change, I close down the aperture, the background begins to become focused. The light "blossoms" narrow very quickly as you reach f/4 and tighten up dramatically. There are no focus ring changes taking place at all, just aperture settings.
It graduates through the following settings:
f/1.4, f/1.7, f/2, f/2.8, f/4, f/5.6, & f/8
Remember: no zoom lens has an aperture wider than f/2.8
Doing this with your own lens, you will begin to understand how you can turn a normal, mundane shot into an interesting piece of art. You just have to understand what is going on in there and how to set up your lens for the spectacular, but then again ... when it comes to this ... f/4 is not all that spectacular. :D Get a wider lens!
Camera issues ... as usual
Look, you have to focus on a subject in there, somehow. You need to have some room ... if I can just get the dog to sit still ... LOL, I'll show ya!
Speaking of cameras ... the temperature is so low here, -6° F actual (-25° F with the wind), I actually lost one of my exposed, perimeter security cameras to it. Rough times ahead, this year. And me without a heat tape! All the neighborhood birds are hiding in the leeward bushes, along the front of the house, avoiding the trees all together, trying to keep warm. You walk out the front door and, suddenly, you feel like you walked into a storm of pigeons downtown.