Since PhotoFiltre doesn’t have a camera flash effect, I’m giving you one to use. Save this camera flash I made for you.
Open up your picture in Photofiltre and click the Photo Masque button. Go to your My Pictures folder and find the camera flash texture.
Make your settings however you want. Mine were like this:
You can look for more lens flares on Deviantart.com and use this technique to apply different ones to your pictures.