Pro Lens Add-On is a Blender add-on that lets you customize your lens bokeh. It simulates the common lens characteristics of a real camera lens, including bokeh cutoff, lens fringing and chromatic aberration. The developer created it because lens bokeh is a significant factor in render realism.
The add-on comes with two base cameras, one anamorphic and one spherical, each fitted with three lenses. It runs on Cycles 2.92 or higher; on earlier versions it produces an HDRI stretch glitch. Documentation is included, and a demo video and tutorial are available.
Released under a Creative Commons license, Pro Lens Add-On carries a top rating from a small set of reviews. The developer notes it may have a few bugs but describes it as worthwhile.