Interesting.
Why no real pan shots in the images for the review ?
Everything is shot nearly head on or trailing, no pans showing motion. Nothing that demonstrates the lens' ability to create nice separation of subject and background with Bokeh.
Oh and a "micron" is an abbreviated term for "micrometer", or a millionth of a meter (1/1,000,000 meters). Your article states "....less than 0.1 microns (less than 1/10,000th of a millimeter) " A typo I guess.
Sorry I'm just trying to understand how you demonstrated the capabilities of the lens. Fast sports are typically shot with fast lenses, which this Fuji is, but you stopped it down to F/10 and F/11 creating images that could be taken with many lenses.
The purpose of my using this lens was for testing the
AF performance between the X-T3 and X-H1. This was not a lens test, as a matter of fact, in this AF testing, the lens was configured to be a non-variable "control factor" for this study as it is Fujifilm's fastest focusing lens. Any differences would therefore be based on the performance between the two cameras, not the lens. For motorsports, one shoots in shutter priority, and for the scenarios under test, I shoot at 1/500th of a second. At ISO 400, depending on how bright it is at the time, this puts the f/stop somewhere between f/9 and f/11. Also, I need the cars to be sharp from front to back so that if a car appears to be "soft", its due to the AF system and NOT from a lack of DOF. And yes, there are other lenses, e.g. the XF100-400 that can shoot racing cars at f/9-f/11 at a comparable focal length, but those photographs will not have the image quality that is obtained from this lens. You have to view the images at full-res in 5K on a large display to see these differences, or better yet, make large prints at 300 dpi.
The reason there are no panning shots showing "motion" is because, quite simply, this lens is 4X too long for a panning shot at the corners I shoot at with credentials for this track. The typical focal length for a panning shot of a car at Sonoma Raceway is
70mm, not 300mm. Moreover, panning shots don't really stress the AF system very much because the distance from the camera to the car or bike doesn't change very much at all in a side-panning shot; I can nail those all day long, witness this panning shot taken with the 50-140 f/2.8, which is the lens I would use at this track for panning shots (this is an X-T2 shot, which, BTW, also works REALLY well).
The scenarios that stress AF systems are situations with a high rate of acceleration, particularly out of a slow corner where the rate of acceleration is the highest. The most challenging situation for maintaining AF lock and tracking is a racing vehicle rapidly accelerating AWAY from the camera, e.g. this photograph (this is an X-T2 shot, also).
Yes, I know that, technically, the term is micrometer, I'm a scientist by profession. The reason I specifically chose the term "micron" is because that is the unit of measurement that is most widely known by the lay public.