First of all, good evening from Spain. I'm not an active poster but I'm an active the reader, despite that, I haven't find a solution or an explanation for my problem.
Some days ago, I was shooting a music clip, I had a BMPCC camera with Kiev16U Vintage Lenses, those are small russian ones that work pretty fine.
My problem appeared while we were watching the recorded clips.
I had some shots that were sharp and detailed, like these:
But I had some other ones that were not as sharp, I was shooting that with the same lenses but those are not as sharp as the other ones: