I will discuss the ways in which the existence of a minimum lengthscale (from string theory, or elsewhere) may modify the generation and evolution of perturbations during inflation. I will focus on a specific toy model, where the fundamental length is inserted into the direcetly into the uncertainty relations and describe the resulting changes to the perturbation spectrum. Finally, I will assess the potential observability of these changes and thus whether the "cosmological microscope" of inflation can probe physics at Planckian lengthscales.