The RunCam Robin Micro FPV Camera is lightweight, budget friendly FPV camera. The Robin was designed to have super low latency (6ms), clear picture, and a WDR (wide dynamic range) even better than the RunCam Eagle (120dB of range!).
Weighing only 5.5g, it won't slow you down. As a micro FPV camera, it's dimensions are 19 x 19mm, but it also comes with a full-size bracket adapter if you'd like to fit it in a larger housing.