  This work is devoted to the study of the optical properties of the
charged-rotating-NUT-Kiselev (CRNK) black hole in the Rastall theory of
gravity. By investigating the motion of photons in the CRNK black hole
spacetime in the Rastall gravity we show that the deflection angle of photons
due to the gravitational lensing is mostly influenced by the NUT charge,
parameter of the equation of state for the quintessence and the quintessential
intensity. We observe that the effects of the rest of the spacetime parameters
are negligible on the deflection angle. We present the shape of the shadow cast
by the CRNK black hole in the Rastall gravity for various values of the
spacetime parameters. We demonstrate that spin parameter $a$ of the black hole
changes the position and size of the shadow of the black hole very little.
While changing the values of the rest of the spacetime parameters can alter the
shape and the size of the observed shadow of the black hole significantly. We
observe that the radius of the black hole shadow and the deflection angle of a
photon are bigger for the CRNK black hole in the Rastall gravity, as compared
with the case of the Kerr black hole. Lastly, we show how the spacetime
parameters can change the observables $R_s$ and $\delta_s$, being the average
radius of the shadow and the distortion parameter that measures the deviation
of the shape of the shadow from a perfect circle with radius $R_s$,
respectively. Our results show that in most scenarios, for bigger values of
$R_s$ we get smaller values of the parameter $\delta_s$.
