Home 2009 Workshops CD Courses e-Books Images for Sale Business Photography Articles Private Tutoring Seattle Classes Equipment Check Out View Cart Wish List Contact Us Privacy Returns Special Offers   Depth of Field Preview Friend or Foe $5.00 Your depth of field preview button is one of the most important functions on your camera. It allows you to see what is in focus in the final image. That is not possible to determine when you normally look through the viewfinder. This article explains the pros/cons and how to use your depth of field preview.