09 Nov Should you upgrade? New Sony a7 IV vs a7 III

Source: DP Review

Introduction

Sony’s new a7 IV is the continuation of its core line of full-frame mirrorless cameras. It includes a series of upgrades but it’s also seen a price increase. Given how good the Sony a7 III was, we wanted to answer two questions: Which camera is the better buy, and is there any sense in upgrading?

In this article we’re going to take a closer look at these two full-frame cameras to see how they differ and try to help you work our which is the better choice for you.

Specs compared

On paper, the biggest difference between the two cameras is simply the sensor resolution, with the a7 IV making the jump to 33MP, rather than using the familiar 24MP chip used by the a7 III and several of its rivals.

For once this is perhaps the least significant difference: the new chip will certainly deliver a little more resolution and scope for cropping, but it’s the shift from the Bionz X-branded processor to one dubbed Bionz XR that leads to most of the meaningful differences, whether you’re a photographer or video shooter.

Both cameras shoot at up to 10 frames per second, with both being limited to 12-bit lossy compressed Raw when they do so. However, when you don’t need so much speed, the a7 IV offers a lossless compression option for its Raw files, avoiding any risk of the odd artefacts that can become visible at high-contrast edges with heavy

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