A brief video to show how to quickly create a slideshow in the new Photos app that comes with Apple's OS X.
Mac: How To Display Photo Slideshow Using OS X Finder. By David K. Sutton. So, you Also when in full-screen, a “ Play ” button is revealed.
Option+Spacebar to launch image(s) into the full-screen slideshow mode; Spacebar to pause/ play the image slideshow ; Left Arrow to go back. Import Batch Photos to Powerpoint Slideshow