After weeks of leaks and rumours, the Fujifilm X-T4 has finally been officially announced, and the versatile mirrorless is really the rival to the Sony A6600 and Panasonic GH5 we've been waiting for. However, the news that the X-T4 won't be replacing its predecessor, the Fujifilm X-T3, is perhaps just as interesting for anyone considering a new mirrorless camera. This camera will still be on sale as a more affordable alternative to its new sibling, so look out for other price cuts on the older model. But back to X-T4. The main reason it bills itself as one of the best all-round cameras you can buy is because it brings two major upgrades in the form of image stabilization. on the body (IBIS) and a fully articulating touch screen. Together, these features add significantly to its appeal, especially to video recorders. This five-axis IBIS mechanism can apparently provide 6.5 stops of stabilization when used with 18 of Fujifilm's total collection of 29 XF/XC lenses. In the real world, it means being able to shoot run-and-gun video without the need for a gimbal, and also the freedom to take handheld photos with high shutter speeds. The icing on the X-T4's video cake is that it can also shoot Full HD video at 240 frames per second for a super slow motion effect. (Image credit: Fujifilm) Beyond these additions, the X-T4 brings two other big physical improvements over the X-T3. Its new NP-W235 battery will last for 500 shots per charge (or 600 shots in 'eco mode'), which is a significant boost compared to its predecessor's 390-shot rating. The only downside is that anyone with existing NP-W126S batteries won't be able to use them in the X-T4. The big improvement to the final design is a new shutter mechanism. There are some benefits to this, one being that, like the Fujifilm X-H1, its shutter is much quieter (about 30% less audible than the X-T3), which is a plus for street or wedding photographers. But perhaps more importantly, it allows the X-T4 to shoot at an impressive 15 frames per second in continuous shooting when using sound. Mechanical shutter. It's very fast and you could put it up there with the best mirrorless cameras for sports and action shooting, assuming its autofocus can keep up. Speaking of which, Fujifilm says that a new phase-detection AF algorithm will boost the X-T4's autofocus speed, as well as its tracking performance and face/eye AF. We'll have to wait for our full review to see if this bears out. (Image credit: Fujifilm)