a micro FPV camera needs to be small and light (less than 5g), needs a good input voltage filter (to avoid interference) and should be robust enough to survive a few crashes.
- to keep the antenna small, the 5.8GHz band is ideal
- linear antennas the lightest and most robust
- for cam/vtx unit to support OSD, it needs video-in and video-out
- you need a suitable mount to fix the camera on the quad
- 20˚ is a very versatile camera angle
Im primarily using the VM2751 camera. Its one of the lightest, delivers above average image performance, good inout filtering, video-in and -out connections, PAL/NTSC selector, 40 channels with a light-weight LED channel indicator, and tends to take a solid beating without falling apart.