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With direct-vision finders, the opposite is often true. When you view, everything appears in focus but this is rarely, if ever, matched by the final shot. With a little luck the main subject is still in focus, but foreground and background may not be. In this case, depth of field is much less than it appeared in the viewfinder.

It’s not hard to understand that a direct-vision finder doesn’t match the final photo. You’re looking through a separate window, not through the camera lens. But in TTL viewing you are looking through the camera lens, so surely what you see should match the final photo?

Well, no. You are looking through the same lens, but it isn’t necessarily doing exactly what it does when it takes the photo. Specifically, the aperture is often different. When you view, normally the aperture is at its widest and depth of field is minimal. When you take the shot, however, the camera often sets a smaller aperture, causing depth of field to increase. Camera manufacturers set things up this way as it lets the most light in at the viewing stage, and therefore gives the brightest image in the viewfinder (easier to see than a darker one!), regardless of the settings you use to actually capture the shot.