All-new 33MP BSI-CMOS sensor and processor
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All-new 33MP BSI-CMOS sensor and processor

At the heart of the a7 IV is an all-new sensor delivering 33MP of resolution, a comfortable bump over the 24MP of the Mark III. Our initial impressions are that the new sensor will of course provide you with some more detail, and low-light performance is unlikely to suffer perceptively. One thing we were a bit disappointed by is the readout speed – for stills, readout takes around 1/15 sec (~66ms), so if you opt for the silent electronic shutter, you may see some rolling shutter artifacts with moving subjects or under artificial lighting.

In movie mode, the readout speed drops to around 26.5ms (we think the sensor is dropping from 14-bit readout for stills to 12-bit for video), but it means that rolling shutter artifacts are better controlled.

That sensor is attached to an updated in-body stabilization unit, with Sony claiming a 0.5-stop improvement over the previous model. Keeping all your images and video clips flying off the sensor and to your memory cards is one of Sony's latest 'Bionz XR' processors. This latest processor effectively banishes Sony's interface lag to the dustbin of history, and also brings welcome improvements in menu organization and touchscreen functionality.