Most weak lensing surveys to date have been conducted at optical wavelengths. These surveys require high resolution, wide field data in order to extract adequate shape measurements for the purpose of constructing shear maps and statistics. Great progress has been made with shear estimators; however, subtle systematic effects are still a concern for current and future optical lensing surveys.
Radio lensing measurements are therefore an intriguing alternative. Forthcoming radio surveys, such as superCLASS, will require novel shape measurement methods in order to fully reach their potential and pave the way to lensing with the SKA. However, much more exploration is needed to find accurate techniques for producing shear maps from radio data. For instance, many such techniques will suffer from the difficulty of making unbiased images with limited UV coverage. We present FILM, which does not attempt to find shear estimates for individual galaxies, but instead estimates the Fourier modes of a large scale shear field directly from the visibilities of a radio survey. We will discuss the successes and limitations of our approach so far.