Have someone tried if the live view effect OFF is able to fix the issue in af-s?Similar to you, found it quite difficult to replicate on my sigma 16mm at first but once I did, was able to do so consistently. But the same methodology didnt apply to the 50mm. In any case, if it's difficult to reproduce might be difficult for Sony to notice a problem
I'll have to give that a try.Have someone tried if the live view effect OFF is able to fix the issue in af-s?Similar to you, found it quite difficult to replicate on my sigma 16mm at first but once I did, was able to do so consistently. But the same methodology didnt apply to the 50mm. In any case, if it's difficult to reproduce might be difficult for Sony to notice a problem
What is live view effect?Have someone tried if the live view effect OFF is able to fix the issue in af-s?Similar to you, found it quite difficult to replicate on my sigma 16mm at first but once I did, was able to do so consistently. But the same methodology didnt apply to the 50mm. In any case, if it's difficult to reproduce might be difficult for Sony to notice a problem
The issue with AF-S has been reported by some not to occur with Live View Effect disabled.What is live view effect?Have someone tried if the live view effect OFF is able to fix the issue in af-s?Similar to you, found it quite difficult to replicate on my sigma 16mm at first but once I did, was able to do so consistently. But the same methodology didnt apply to the 50mm. In any case, if it's difficult to reproduce might be difficult for Sony to notice a problem
I checked the SEL50F18 just like I did with my Sigma 30/1.4, Infinity distance, f/2, NTSC, Live View Effect enabled (my usual mode), several tries switching between using EVF and LCD for AF with EVF showing the missed focus. I didn't check different apertures since the images at f/2 told me what I wanted to know.I have managed to replicate the issue at f5.6 on the Sigma 16mm in Live View. Unfortunately, this time round, Live View Setting Effect OFF doesn't seem to help.
There seems to be a severe backfocus at mid distances to right before infinity. Infinity isn't affected. Focus was set on the red tiles below. I can reproduce this consistently, when you first focus to infinity and then shift focus on red tiles.
You can see that the beige tiles (at the bottom of the photo) are most in focus instead. That is some 10 metres away from the red tiles I focused on.
Meanwhile, you can see the sharpness difference with AF-C.
Still unable to reproduce on Sony 50mm f1.8. Can you tell me--which aperture, NTSC or PAL, how far away is the focus distance? EVF or viewfinder?
Thanks. Can you post a sample photo if possible? Been trying to replicate with your parameters but no go. Maybe my infinity isn't far enough.
I don't save test images and I don't post images to the 'net. However I just did a quick try using the SEL50F18 indoors (it's night here now) at f/2 at a distance of about 3 feet and with AF-S and using EVF then LCD to focus and using AF-C and EVF to focus. All three images were somewhat soft, too close to call any of them sharper than the others. I tried it several times with the same result.
I gave that a quick try using f/2 and it seemed to make matters worse with focusing by AF-S/LCD being as soft as AF-S/EVF focusing, AF-C/EVF focus was fine.
Did further testing and my results correspond to yours (PAL mode). Some further observations:
That's what I've been doing all along, it works perfectly.
As I noted previously, I tried it and it didn't really fix it with EVF or LCD.
Agree with your findings! Just retested with flexible spot medium on a stained glass window at quite a far distance away. F2.8, PAL.
Yes, that seems to be the conclusion. I also realise that yes, live view also manifests the problem at far distances, not just EVF.
OK I just did more tests on the same stained glass window:
Just wondering, is your focus priority set to Release instead of balance emphasis? That might be the issue.
Does this only happen when focusing at infinity? I can't reproduce this issue at f5.6. which camera model?Here is an example of the focus problem at f/5.6 which I could find on both copy of the lenses I tested, though the second one was better and it did happen less often.
In the frame center, the focus difference is barely visible. But the border sharpness of the EVF focused image is much better.
100% center crop: left - EVF focused, right - display focused
100% border crop: left - EVF focused, right - display focused
The problem is that it is an issue for landscape, because it is also happening at f/5.6 or even other apertures in AF-S. It only slightly misses the focus, which causes soft edges.
