It’s difficult to hide that we are enamored with Sony’s new line of digital cameras. A big part of the allure of both the Alpha A77 and A65 cameras and the NEX-7, is the new OLED electronic viewfinder (EVF).
EVFs have the advantage of allowing you to see exactly the same image your camera’s sensor sees and the image it will eventually record, together with any effects, while providing a host of useful information. They also allow manufactures to do away with the optical mirror and create slimmer cameras. Their disadvantages however are that, they are usually not as large or contrasty as optical viewfinders, they are obviously made out of pixels with a finite resolution and might find it hard tracking fast moving action.