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We firstly present a new asymptotical flat and spherically symmetric solutionin the generalized Einstein-Cartan-Kibble-Sciama (ECKS) theory of gravity andthen investigate the propagation of photon in this background. This solutionpossesses three independent parameters which affect sharply photon sphere,deflection angle of light ray and gravitational lensing. Since the condition ofexistence of horizons is not inconsistent with that of photon sphere, thereexists a special case where there is horizon but no photon sphere in thisspacetime. Especially, we find that in this special case, the deflection angleof a light ray near the event horizon tends to a finite value rather thandiverges, which is not explored in other spacetimes. We also study the stronggravitational lensing in this spacetime with the photon sphere and then probehow the spacetime parameters affect the coefficients in the strong field limit.

A new asymptotical flat and spherically symmetric solution in the generalized Einstein-Cartan-Kibble-Sciama gravity and gravitational lensing