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kernpanik

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  1. I am digging up this old thread because AF speed is still an issue for me. At the moment, I own three AF lenses for the Fuji X system: the 90mm f/2, the 18-135mm zoom, and the Zeiss Touit 12mm f/2.8. I use these with two X-T2 bodies. Of the three lenses, the 90mm has by far the fastest and most reliable autofocus. I wish all Fuji lenses were like this one. The 18-135mm is significantly slower but still performs well under normal daylight conditions. However, it tends to hunt for focus when it gets darker. (For example, I was trying to focus a squirrel sitting right in front of me under a tree on a cloudy day, and the lens focussed back-and-forth several times without hitting the subject.) The 12mm Touit has a rather slow AF, but apart from that, it focuses reliably at least in single-AF mode. Low light doesn't seem to affect its performance. Continuous AF on the other hand is much too slow for most applications, such as cats or squirrels walking towards the camera. I assume low-light AF performance depends a lot on aperture, at least this would explain why the 90mm f/2.0 and the 12mm f/2.8 perform better in dark environments than the 18-135mm with its f/5.6 at 135mm.
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