Only in a Newtonian world--but there wouldn't be lensing in a Newtonian world. Once you consider Heisenberg and quantum mechanics you find your signal swamped

Only in a Newtonian world--but there wouldn't be lensing in a Newtonian world. Once you consider Heisenberg and quantum mechanics you find your signal swamped by noise for smaller objects. Now, figuring out this limit is left as an exercise for the reader as it's way beyond my abilities.