We show that, in cosmological microlensing, corrections of order v/c∼Δλ/λ, to the deflection angle of light beams from a distant source are not negligible and that all microlensing quantities should be corrected up to this order independently of the cosmological model used.
@article{arxiv.astro-ph/9902373,
title = {Higher Order Corrections in Gravitational Microlensing},
author = {S. Capozziello and G. Lambiase and G. Papini and G. Scarpetta},
journal= {arXiv preprint arXiv:astro-ph/9902373},
year = {2009}
}