NUT charges and black hole shadows

We study the nontrivial effects of NUT charges on shadows Kerr-Taub-NUT black holes seen by zero-angular-momentum-observers. Inclination angles with which observers gain maximal, locally extreme or minimal shadow sizes and distortions are investigated for different distributions string singularities. Typically, we discover that when observer approaches singularity, size can be relatively very small while distortion being quite large. And exceptionally, find singularity locates only at south pole axis hole large enough charge, is maximal a north observer.