DSLR Dilemma

Live view

Using a Live View on many digital single lens reflex camera can be quite different than using a LCD on a compact digital camera.

Live viewThose of us who use compact digital cameras appreciate the benefits of the LCD that lets us compose a scene as well as watch exposure changes as they happen. Live View LCDs on digital single lens reflex cameras work differently.

Currently, not all DSLRs have a Live View LCD. The first did not appear until 2006, when Olympus introduced Live View on the EVOLT E-330.

With DSLR Live View, the LCD blacks out

When using Live View, the DSLR mirror is lifted first so that the autofocus sensor can be used in a similar fashion to Point-and-Shoot. However, unlike a Point-and-Shoot, there is a short period where the screen blacks out. The amount of time varies between a fraction of a second to several seconds, depending on the brightness of a scene. This process happens every time you refocus.

The momentary blacking out may not be a problem for photographing stationary subjects or manually focusing, but a black screen is less than ideal for photographing action. In addition, DSLRs are heavy, so holding one at arm’s length to compose and take a shot can be downright difficult. Using Live View for framing is most suitable when a tripod or other camera support is used.

Dual auto focus modes in Live View

The Canon Rebel XSi I’m considering offers the option to switch in Live View from phase detection autofocus to contrast detection autofocus. The latter is the autofocus method used in compact digital cameras.

Contrast detection AF is very accurate but a bit slower than phase detection AF. However, the screen doesn’t black out when using contrast detection. On the XSi, contrast detection AF can be made the default for Live View.

About the author

Gail Bjork

Gail Bjork, who is passionate about digital photography, is the owner and editor of Digicamhelp.Gail is the author of three illustrated ebooks about digital photography. A number of her photos and digital photography related articles appear at other websites.In 2006, a series of her photos, People in the Louvre, were exhibited at the Underground Photo Gallery
in Iisalmi Finland. Eight of her photos taken in the Florida scrub are on permanent exhibition at Parrish Medical Center in Titusville, Florida.Gail served twelve years as an elected member of The School Board of Palm Beach County, Florida, one of the largest school districts in the U.S. She has also been the editor of a small town newspaper and a free-lance writer. Gail and her husband owned and ran several small businesses.