Fast Prime lens (I used a 50mm 1.4) **The main thing is to use a fast, wide open aperture, such as 1.8 or 1.4. **
Black cardstock or construction paper
Exacto knife (optional)
Shaped whole punches (optional)
Measure and cut a circle around the size of the circumference of the band. It should be able to cover the band you just made. You can use a circle cutter or do what I did and just traced around my lens cap. I then cut it just slightly larger than what I traced.
Using your widest aperture, find something that will give you nice bokeh (like Christmas lights or street lights) and manually “unfocus” until you see the lights start to take shape! Or, focus on something close to you with the bokeh lights in the background. Here are some pictures of some bokeh coming through the dappled light of the tree outside our yard.
-You may need to use a tripod since the bokeh hood will let in less light.
-If you want to focus on something, try to have it as far away from the lights as possible, to make the bokeh stand out more.
-Experiment with different shapes and sizes!