Unfortunately, we don't currently know which focal length the framing guideline matches. The FDA-SV1 viewfinder accessory mounts in the same place as the proprietary flash and external stereo microphone accessories, but since it's purely optical, it doesn't have any electrical connections. There's also something to be said for the image viewed through a really nice optical viewfinder, something even the best electronic finders struggle to match with current technology. They also use no battery power, providing a significant advantage over framing images on an LCD display. Optical viewfinder accessories are generally rather less expensive though, and don't require complex (and perhaps delicate) electrical connections to the host camera. If you're suitably familiar with your camera's external controls, they even allow you to browse menus and quickly change settings without taking the viewfinder away from your eye. They can provide essentially anything the main LCD can, allowing photographers to view the same overlays that they'd see on the LCD, including things like live histograms that are simply impossible with an optical viewfinder. Both paths have already been trodden by Micro Four Thirds cameras from Olympus and Panasonic, and each has its advantages and disadvantages.Įlectronic viewfinder accessories allow not only framing of images without parallax error, but also allow review, and even preview of how zoom, white balance, exposure settings, and the like will affect the final image. The only acceptable option for providing a viewfinder eyepiece was to do so externally, and here Sony faced two choice: an optical, or an electronic viewfinder accessory. They also increase the size of the camera itself, diluting the main advantage that SLDs hold over their SLR brethren - and that would hardly fit with Sony's design ethos for the NEX-series cameras. Some competing cameras have included a built-in electronic viewfinder in place of the optical finder, and with the higher-resolution displays now available, these can serve as a fairly useful replacement. Of course, like any other single-lens direct view camera, the absence of a mirror box negates the possibility of providing a through-the-lens optical viewfinder. Among the concessions made in the name of attaining the Sony's NEX-5 extraordinarily compact size was the elimination of any form of built-in viewfinder, with the LCD display serving as the sole method of framing and reviewing images.
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