When it comes to accurate focus, there is definitely another problem involved - out of focus. The problem of defocusing is often encountered by many newbies when shooting. There are three main reasons for defocusing.
Firstly, focus failed
If the focus is blurred because the focus is not on the subject, then you can find a clear focal plane before and after the subject. If the focus is deviated greatly, then the entire picture may be blurred and there will be no clear picture.
Want to know if the picture is blurred because of the jitter, you can look at the highlights of the picture. If the highlight portion is drawn into a strip of light, then the camera is shaken during exposure, causing the position of the object in the picture to change.
Lastly, one pc of good backdrop is nessary.
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