RunCam Racer 2, a micro size FPV camera designed specifically for FPV racing with ultra low latency of 6ms and super-WDR. The Racer 2 comes with an additional adapter for mounting in a full size frame
TR Tip : A low ESR capacitor of sufficient rating (eg 1000uf/35Volts for 4S power), across the FC battery pads is helpful against electrical noise that may compromise FPV feed.
If your VTx has an integrated BEC with a stable voltage output of sufficient current capacity consider powering your FPV camera with it, in most cases it will improve the quality of your FPV feed
A LC filter of sufficient current capacity (1 amp is more than sufficient), connected between the camera power source and camera input, is a worthwhile addition for improving feed. If space is a constraint, use a super micro LC filter, usually weighting less than 0.5grams, and hot glue it to the back of the camera.