On this quick video Photoshop senior product manager Bryan O’Neil Hughes demonstrates how remove lens flare from and image but also how to (non-destructively) add lens flare using Adobe Photoshop.
Removing lens flare can be done using the content aware fill or the patch tool (with the content aware fill and different adaptation method to very loose). What Hughes does not show in this short video is how to fix the lighting in an image effected by a lens flare (this can be a more complex process) but he does show how you can fairly easily add a lens flare.
We have already talked about adding lens flare to your images on Aaron Nace more extensive video – “How to Add Lens Flare to your Image in Photoshop“.
You can find many more Photoshop video tutorials on LensVid’s Photoshop section.