Vignetting, bokeh, and depth of field characteristics can be understood using the the aperture series from f/1.4 through f/11.
Example — defunct tree in Dana Meadow
This image taken mid-morning high in Dana Meadow in Yosemite National Park. I offer photo tours to this area.
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Since 2006, Diglloyd Advanced Photography is the authoritative review and reference for DSLRs and their lenses: Canon and Nikon primarily, but also Pentax and some medium format. Reviews of key DSLRs are included, but the primary focus is on lens performance. Also included is a wealth of technique and workflow approaches.
DAP includes thousands of pages of exclusive coverage and high resolution Retina-grade examples detailing Canon and Nikon DSLR bodies and their lenses, with in-depth analysis of sharpness and contrast, color, bokeh, vignetting, distortion, MTF, and flare, behavioral and practical usage.