[mikesbike]

Glad to hear the replacement is fine! The technology of this new top-level lens along with the capabilities of the K=3 III should make for quite a fast and accurate team! No doubt the video is very good too.

[Lev]

Now it"s time for a new 50-135!!

[mctaveck]

Sure. The bad one was 3300355 and the good one is 3301437.
I've also had one from Amazon Warehouse Deal but it was straight up broken-literally some loose parts flying inside .

Hi all, is there anyone else that has the same issue on that lens? Just curious - if yes - if his bad copy falls in this serial number range
Thanks
Danilo

[kramedt]

Hi all, is there anyone else that has the same issue on that lens? Just curious - if yes - if his bad copy falls in this serial number range
Thanks
Danilo

I just bought this lens and I notice the same issue. My serial number is 3302165. It is pretty inconsistent. Sometimes focus is fine others it is way off. I need to play around with it some more. But my early observations are that it seems more prevalent on subjects that are further away and at 50mm. I haven’t been able to reproduce it at 16mm when I pull in tight to a subject. In addition to the k3 iii I also have a k70. I was only able to reproduce it once one the k70 and that was with the outer focus point which isn’t cross type, and the focus was still pretty close just not spot on. I notice it more on k3 iii. And more so in lower light with the outer focus points (which also are not cross type on the k3 iii). To be honest I usually use center point and recompose. The only reason even noticed this was because this thread made me look for it. I also briefly tried to reproduce on my 70-200 and wasn’t able to though I only tried a few shots. It works perfectly in live view. I’m hoping it’s something they can address with a firmware update. Or perhaps I am just trying to exceed the focusing capabilities of those outer focus points. Though when it is off it can be way off. It’s not just slightly out.

[kramedt]

Okay tan some more tests. I wonder if this is more of a k3 iii issue than a lens issue. I tested again on the k70. Took about a dozen. All were in focus except 2 out of the 4 I took using the very outer point. The points clustered around the center were all in focus.

With the k3 iii I got the following:
Top outermost corner point: 3 in focus, 3 way out and one soft
Bottom outermost: 1 in focus, 3 out
Bottom corner of center grid: 3 in focus
One left and down from center most: 5 in focus, 2 out

But I also pulled out the 70-200 again and 2 out of 3 of the top outermost were out of focus.

Though I will say when it missed on the 70-200 it was off by a couple feet (subject was 30 ft or so away). But when it missed with the 16-50 it missed sometimes by a mile. Like sometimes looked as it if was almost focusing to infinity. But given that it mostly behaves on the k70 I don’t think I have a physical issue with the lens.

[mikesbike]

Yeah, when it is noticeably better on a different camera for AF multi-point tracking, it is hard to blame the lens. That would be disappointing for sure if the K-3 III were less than stellar for performance in the very realm it is designed to excel.

[rizi1964]

Hi, bought my copy in May 2023. Serial number: 3300807. Has been in the service center for a week. Permanent misfocusing. Camera locks with the lens. Only with a removal of the battery to solve again. In addition, there is a resistance when zooming between 16-20mm.
Have probably caught an older copy from the serial number range, which has manufacturing problems.
Let's see what result the service center will tell me.

[rizi1964]

Hi, bought my copy in May 2023. Serial number: 3300807. Has been in the service center for a week. Permanent misfocusing. Camera locks with the lens. Only with a removal of the battery to solve again. In addition, there is a resistance when zooming between 16-20mm.
Have probably caught an older copy from the serial number range, which has manufacturing problems.
Let's see what result the service center will tell me.

Today I received my camera and lens back from service. And look: a repair was attempted, but it failed. Have now received a new lens unit. Serial number: 3302623. Hopefully it's a good one.

[Artphoto]

Today I received my camera and lens back from service. And look: a repair was attempted, but it failed. Have now received a new lens unit. Serial number: 3302623. Hopefully it's a good one.

Please keep us informed.I had the same experience as you but i was able to return the lens for a full refund,which i did.I am still interested to get this zoom but i guess i am much more reluctant now because of the focusing issues i had.