camera - Why is there a blur on the outer edges of my captured image? -


i using raspberry pi camera noir v2 along raspberry pi 3b capture images. camera mounted on top surface of box, on inside. have used led strips provide lighting. capturing image of sheet of text placed @ bottom of box using following raspistill command:

raspistill -w 3280 -h 2464 -q 100 -e png -ex night -sh 100  -co 100 -o new.png

the height of box 30cm, unscrewed camera lens little adjust focal length.

from captured image, there visible blur present on outer edges (like radial blur) while text in middle portions appears focused. considered hardware limitation of spherical lenses or thing that, while seeing preview of raspistill, image appears in focus right until moment captures it, @ point, blur @ top , bottom becomes evident.

is problem hardware, or because of our lighting, or there other way rectify this?

additionally, best attributes of raspistill manually set image of text in given situation? have been experimenting brightness , iso result not satisfactory.

this image captured showing blur: https://drive.google.com/open?id=0bxm5mqbqj3wvmhb2vmdzddbyaxm


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