For example, the X-T3 won’t manage 2 seconds at 20fps (with RAW), so if the action lasts 4 seconds, the A7 IV will give you more images in focus. Some cameras may have more fps but the buffer might be limited.The camera with the better AF has a higher chance of giving you good images where the action is at its most crucial (for example when a bird is grabbing a fish in the water). There are no settings that let you control where the out of focus images will end up in a sequence.The A7 IV may have a slower drive speed, but its autofocus is more realiable in every situation, whereas the X-T3 will struggle at times. Personally, I think the AF score gives you a more realistic representation of how much the camera can be trusted. Considering that wildlife is often about capturing difficult moments that may not happen again, many photographers will prefer to have more images on the SD card and that is a fair assessment. X-T3: 72% (green) at 20fps – 14 / 20 images in focusĭespite the lower score, the X-T3 gives you more images in focus per second.A7 IV: 94% (green) at 10fps – 9 / 10 images in focus.It depends on how much of a difference there is between the cameras. Which score should you give more importance to? He rightfully argued that, even if a camera had an inferior AF score, it might still give you a higher number of good images per second because the drive speed is faster. The Drive Score was added later, following the suggestion of our reader Speeding in the comments. To keep things simple, the Drive Score only takes into account the green percentage. The Drive Score shows the hit rate I got with the fastest continuous shooting speed available on the camera, as well as the number of ‘keepers’ (images in focus) in a 1 second burst. For example, if a model can work at 20fps, but the keeper rate is better at 10fps, the AF Score will reflect the performance at 10fps. It prioritises the autofocus performance rather than the fastest burst rate the camera can produce. ![]() The AF Score represents the best keeper rate I got with a precise list of settings and a specific drive speed. We can also argue that an image may look good even if focus is only 90% accurate, and might still be usable in limited form if the action or the light captured is really beautiful. Making this differentiation allows me to better understand how the camera performs and what the potential improvements could be. When I started testing mirrorless cameras, I noticed that slightly soft results were more common than completely out of focus images, as opposed to DSLRs. You may wonder why I bother with the blue score at all, and that is a legitimate question. ![]() The two locations I go to every time are the Red Kite feeding stations at Bwlch Nant Yr Arian and Gigrin Farm in Mid-Wales. August 2020: Fujifilm X-T4 added to the list.September 2020: Nikon Z50 and E-M1 III added to the list, Nikon Z6 score updated, new ranking based on AF rate and burst speed added.November 2020: Canon EOS R6 score added.June 2021: updated the Panasonic G9 score after testing firmware 2.4.November 2021: Sony A1 added, Sony A7 III score updated. ![]() January 2022: Fujifilm X-S10 added, X-T4 score updated.April 2022: various changes to make the information more complete and easier to navigate.June 2022: A7R IV and A7R III score updated.December 2022: Canon R7 and Sony A6600 added.March 2023: Fujifilm X-H2 score and X-H2S firmware 3.0 feedback added.
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