![]() In fact, all five can be customised to any of 46 functions, and so too can the five buttons on the navigation pad. There are three customisable buttons, plus a button and associated switch that toggles between two labelled functions: AF/MF and AEL. We got around this by disabling the wheel's default function and assigning ISO speed to the C3 button, which is unassigned by default. Another snag is that the rear wheel is easy to nudge by accident. There's no way to customise the behaviour of the Auto ISO function. It was only when the ISO speed reached 6400 that wider apertures were used. Testing with the 55mm f/1.8 lens, the aperture seemed to be stuck at f/4 in low light, resulting in needlessly high ISO speeds. In fact, we found ourselves using this method routinely, as the fully automatic settings are less than ideal. This is perfect for carefully controlling depth of field and motion blur without having to worry about the overall exposure level. Leave the ISO speed on Auto and the exposure remains automatic for a shutter-and-aperture-priority mode, complete with exposure compensation. In manual exposure mode, the command dials handle shutter speed and aperture while the rear wheel looks after the ISO speed. There are dual command dials, a mode dial and exposure compensation dial neatly arranged on the top plate, plus a wheel on the back. That's a little over half the weight of a Nikon D610 or Canon EOS 6D with their kit zoom lenses. The result is a full-frame interchangeable-lens camera that weighs 474g, or 769g with its 28-70mm kit lens. The a7's sensor barely fits behind its lens mount – the incoming light must be turning some tight corners inside the lens to cover the entire frame. One of the reasons why CSCs are smaller than SLRs is that they dispense with the lens mounts that were originally designed for full-frame cameras. It's also an extraordinary technical achievement. It's an important milestone in CSCs' ability to challenge SLRs' dominance among photography enthusiasts. While it uses the same E-Mount lenses as previous Sony CSCs, this is one of the first CSCs (along with the 36-megapixel a7R) to use a full-frame sensor. However, the big change is on the inside. The SLR-like design with its angular viewfinder hump is a departure from previous NEX models (now going by the Alpha brand), and resembles the Olympus OM-D range. Sony Alpha a7 review: What you need to knowĪt first glance it looks like a typical upmarket compact system camera (CSC). We're tempted to say that the a7 is its greatest achievement to date. ![]() Technical innovation doesn't always produce products people actually want to buy, but Sony's digital cameras have been delivering the goods on both fronts recently.
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