What is Depth-of-Field Preview and why is it important?
A. Depth-of-field Preview is the ability to stop the lens down to the preset shooting aperture while you are composing your shot. The F4 does this when you press a button on the right side of the body near the lens. When you stop the lens down, then you can see how much of the image is in focus at that aperture. Thus you can see how deep or shallow is your field of sharp focus. In Manual Mode and Aperture Priority Mode, You can also change apertures manually and see the effect of a larger or smaller aperture on Depth-of-Field. Some people suggest this is a less-than-useful feature because when you stop down to the smaller apertures (f 8 – f 22 or f 32) the image becomes quite dark and the actual depth of the field of sharp focus becomes more difficult to see. For you to use depth of field preview effectively, your eye has to adjust to the reduced amount of light coming through the viewfinder. Here are two tips to help your eye adjust so you can see actual depth of field: 1. Set the cam
