WILL NICHOLLS, PETAPIXEL:
Just starting out in photography and want to learn how to blur your backgrounds when shooting portraits? Here’s a 4-minute video from Sheldon Evans that looks at how you can create a beautiful bokeh in your photos.
A soft background, or bokeh, is achieved by using a shallow depth of field. This comes from using a lens with a large maximum aperture (indicated by a low f-number like f/2.8).
The smaller the f-number, the shallower the depth of field you can achieve.
Read more, and watch the video tutorial, from here.