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Your SLT-A65 has two display screens, of course: the internal 0.5-inch, 2,359,296-dot electronic viewfinder, and the external three-inch 921,600-dot back-panel color LCD. You can use either of them at any time. The A65 will be kind enough to switch back and forth automatically by using its Eye-Start sensors to decide whether the camera is held up to your eye (thereby activating the EVF), or held at arm’s length (in which case, you probably want to work with the back-panel LCD). Although you can alternate between them, these two viewing systems are not completely interchangeable. Each has its own advantages and disadvantages.
Whether you use the LCD or EVF in a given shooting situation is largely a matter of personal preference and/or convenience. But there are some things to consider about your two viewing systems: