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Focus issue mystery
333 7 2020-9-24
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syd\
lvl.2
Flight distance : 33593 ft
United Kingdom
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I have just reviewed 3 hours of drone footage, the majority of which is fine but the occasional clip is slightly blurred, even though I made no adjustments between clips. In the early days of using the drone, I made the mistake of touching the tablet screen and all subsequent clips were blurred. Following advice on this forum, I changed the focus setting from AUTO to manual infinity. This seems to work for all clips as they are all distant views. The problem clips are also distant views. For example, out of 5 clips all filmed within minutes of each other, clips 1 & 2 are perfect, clip 3 is blurred, and clips 4 & 5 are perfect. I cannot remember if the drone was landed in between clips. I think many of them were start/stop filming within the same flight. Many of the problems were filmed on different days.
Has anyone else had this issue? I have the standard Hasselblad with no zoom. I am filming in 4K.
2020-9-24
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Blériot53
Captain
Flight distance : 2079941 ft
United Kingdom
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I have the Mavic 2 Zoom. Sometimes, on take-off and climbing to height, I discover that the lens is slightly out of focus and everything is blurred, but tapping the smartphone screen activates the focus procedure and the problem corrects itself.
2020-9-24
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DJI Stephen
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Hello there syd\. I am sorry for the trouble this has caused and thank you for reaching out. Can you please post sample videos showing the said issue for us to be able to see and be able to assist you? Thank you.
2020-9-24
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syd\
lvl.2
Flight distance : 33593 ft
United Kingdom
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Stephen, Thank you for replying. It is nice to see DJI input. I have placed 8 10 second samples on the cloud link below. I have named 3 as good, to show the camera is working correctly, and I have named 6 as bad, which are the blurred clips. Many of the bad clips were within minutes of the good clips. I hope you can suggest what has gone wrong wrong. The drone was set to infinity for all clips.

https://drive.google.com/drive/f ... KmPfEkA?usp=sharing
2020-9-25
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Ex Machina
Captain
Flight distance : 1784344 ft
United States
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I always have focus peaking turned on as a reality check.
2020-9-26
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syd\
lvl.2
Flight distance : 33593 ft
United Kingdom
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It seems DJI Stephen has vanished after his offer of assistance. I even PMed him but no reply. Is anyone else able to explain this problem?
2020-10-15
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Ian in London
Captain
Flight distance : 6805617 ft
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United Kingdom
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syd\@sydh.co.uk Posted at 10-15 12:01
It seems DJI Stephen has vanished after his offer of assistance. I even PMed him but no reply. Is anyone else able to explain this problem?

Yes!  chances are you started recording at take off.  The mavic will focus on the ground instead of distance objects.
Watch this; I made this after suffering a load of out of focus clips.....

Ian


2020-10-15
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syd\
lvl.2
Flight distance : 33593 ft
United Kingdom
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Ian in London Posted at 10-15 12:07
Yes!  chances are you started recording at take off.  The mavic will focus on the ground instead of distance objects.
Watch this; I made this after suffering a load of out of focus clips.....

Thanks Ian. That could be the problem. I wondered if I had touched the screen but in AFC it should have instantly refocused. I now use infinity which seems OK but I have not checked it for pin sharp yet. I watched your YT and it was informative. I have subscribed and when I get time, I will scan through your other clips.
Nice Iceland shot. Alas, when I toured Iceland it was before my drone days.
2020-10-15
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