Lens Effects simulates a wide range of lens, filters and specialty cameras. Topaz has very helpful online videos on how to use it, as well as a short "how-to" pdf tutorial to get you started. Like Adjust, it was an easy to use plug-in. I launched Lens Effect from Lightroom and edited a photo in under 5 minutes as an experiment. Please note that the effects has been exaggerated for demonstration purposes! I do feel that the program is powerful enough to give realistic effects. Although capturing the effect on camera would still be ideal, the program is a great alternative for those who don't own the various filters and lenses (which can be expensive), as well as being a great tool for those with creative flair!
The example below uses the Bokeh - selective option