Sony 700TVL PAL 3.6 mtv board camera, only $18
http://www.focalrc.com/hd-700tvl-1-3-sony-pal-3-6mm-mtv-board-lens-mini-cctv-security-video-fpv-color-camera-p21465.html
Suitable for brushless motors and speed controllers.
5pcs, $7.89 and shipped.
4mm Aluminum props adapter
And you can get other specs of prop adapter like: 2.0mm, 2.3mm, 3.0mm, 5.0mm, 8.0mm from here: Aluminum prop adapter
Can be fixed on the Carbon fiber tube of that outdiameter is 16mm
Designed for Motor mounting holes from 19-25
Material:Carbon fiber
Motor mount with 16mm clamp
32 channels: Cover A, B, E bands and F band (Airwave band), 4 bands and all frequencies compactable;
Two switching buttons: CH button for frequencies channels switching, FR button for frequencies bands switching;
Two digits display: one for CH and the other for FR, real-time positioning which...
Super high resolution D-WDR color camera;
700TVL horizontal resolution;
2.1mm Wide Angle lens;
D-WDR; 2D NR;
White spot repair function;
HLC, private mark function;
Reversing guideline function;
Day/night mode is optional;
Support OSD menu;
Next chip 2090;
Sony PAL camera