In this paper we study gravitational lensing by STU black holes. We considered extremal limit of two special cases of zero-charged and one-charged black holes, and obtain the deflection angle. We find that the black hole charge increases the deflection angle.
@article{arxiv.1306.0601,
title = {Gravitational lensing of STU black holes},
author = {Hassan Saadat},
journal= {arXiv preprint arXiv:1306.0601},
year = {2014}
}