adobephotoshoplightroom

In Lightroom, the backslash key can be used in the Develop module to toggle the Before/After view. But you can actually do more: here’s a 50-second video that shows you how to customize which "Before" view is shown.

If you captured a range of exposures for a certain scene, you don't have to painstakingly adjust each one once you've got them in Lightroom. This really useful tip from the folks at Adobe shows you how to do it in a single click.