This mode offers much higher resolution, and since the primary image sensor is being used to frame the image, you can confirm the point of focus with confidence. It also has rather looser frame coverage, as detailed on the Optics tab.įor that reason, Sony offers a secondary live view mode, dubbed Focus Check LV, which uses the more traditional live view method found in most DSLRs, with the live view feed derived from the main image sensor.
Best viewfinder for liveview manual#
A combination of the secondary sensor's low resolution and difficulties in precisely matching the point of focus between main and secondary sensors also conspire to make it relatively less useful for manual focus adjustment, unless you've a generous depth of field to work with. Because the secondary sensor is relatively small compared to the primary image sensor, the live view feed can be noisy in low light. The approach has a couple of drawbacks, though. This method also has the advantage of not warming the main image sensor during live view operation, which could raise noise levels in the final image - especially during long exposures. The default live view mode in the A580 derives its image from a secondary sensor in the viewfinder assembly, an uncommon technique that allows the camera's phase detection autofocus system to operate without interrupting the live view feed. As in several of Sony's past models, the live view functionality of the Alpha A580 is unusual in that it offers two operating methods. Like most SLRs these days, the Sony A580 offers the ability to frame images not only through its optical viewfinder, but when in live view mode, also on its rear-panel LCD monitor.
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