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I've been having issues with my 50 -140mm missing focus. I most often use in on a tripod in controlled lighting situations, so I turn off OIS. Manual focus doesn't seem to be an issue, but on the rare instances when I just want to get and lock focus I set the camera in S-AF. I notice that the focus is continuously fore and back focusing all the time and my focus is hit and miss. S-AF is the same as C-AF. Does anyone have this problem... or know how to solve it? Thanks!

I've also wondered about the occasional black frames I get on my X-T2. I imagined it was just me turning off the camera too soon after pressing the shutter. My black frames almost always occur during street shooting after I take a quick image or a quick series of images. I bring the camera away from my eye and hit the power switch as the camera slides down my strap. All this happens pretty rapidly. I realize I needn't and perhaps shouldn't shut off the camera with this style of shooting. It's a bad habit I got with my Nikon (which continued to process through the buffer even after the it was powered down). I recently reset the X-T2 to factory settings, built up my preferences again, am learning better habits, and haven't seen the black frames return....yet. Perhaps not cause and effect, but the reset removed a couple of un-fathomable (to me) benign behaviors AND it focused my mind enough to learn more about my camera. Fingers crossed

The 50 -140 is a lens with an image quality that almost everyone agrees is excellent. That's why I love it. I like it's constant aperture, quick focus, it's OIS, the weather sealing, and pretty much everything else about it too. The price for what you get isn't too steep for me. You already know about the image quality of the 55-200, but in other comparisons, the 50-140 is larger, heavier, louder and clunks deep within it's bowels pretty much every time you take a step when the camera is turned off (if you're carrying it around on a neck or shoulder strap). Others may disagree, but I don't think it makes a very good "walking around" or travel lens. It takes more room in your bag and you have to have eaten your Wheaties to be able to carry it around all day, in or out of your bag. I like the 50-140 in the studio, for portraiture, and when I want to separate subject and background. The OIS makes it easy to hold and shoot, but it excels when on a tripod or monopod. The 55-200 is capable of much of that as well, but it may be, perhaps, better suited for landscape work than the 50-140 or when you want to have it on your camera or available in your bag while shooting out and about.

Thanks for your reassurance. I've heard from others that the clunking noise is normal when the camera is turned off or is off-camera . I too don't try to knock the lens around. The crispness of the images is superb and I've not regretted the purchase for a moment.

Koban, When you say you experienced "the noise" do you mean the humming of the OIS, when the camera is turned on... or the "clunk" of something inside the lens moving back and forth when the lens is off the camera and when the camera is turned off? Thanks.

I bought the 50-140 last week to mount on my X-T1 and have been running it through it's paces. The lens is superb. I've no issues with image quality at all. I've read about and experienced the noise of what I assume is the OIS. I don't like the noise in quiet situations, but I can also hand hold and shoot at pretty slow shutter speeds... so the trade-off is a fair one. What I haven't read in any reviews is the soft "clunking" of the lens I hear and feel when I'm handling it... mostly when its off the camera while taking it out or putting it away. Something in the lens slides and "clunks" lightly as I point one end up and then turn it back down again. I'm not excessively worried about it, but I'd like to know if this is normal for this lens. If it's not, I've got another week to return it for another copy. Thanks for your feedback.