Can someone please tell me how to get rid of the blur on the middle?
That’s not blur. It’s a moiré pattern It’s caused by a combination of the closely spaced lines in your model and the pixels in the image. To get rid of it zoom in (although you may not be able to see the entire model, or get rid of the closely spaced lines.
See: What is moire effect? - Definition from WhatIs.com
Moiré pattern - Wikipedia et al.