Fixing Lens Distortion
Lens distortion is common in photos that were taken with wide angle or zoom lenses.
You can save your settings as a preset for future use.
To Fix Lens Distortion:
- In Develop mode, select the Geometry tab.
 - In the Lens Distortion group, adjust the slider to the left for a bulge effect, or adjust the slider to the right to stretch the edges of the image.
 
Click the Show Grid button 
  to  display a grid over your image. This tool is useful when adjusting alignment in your images.