A little comparison of a 2.1mm wide lens and a 4mm F1.2 Low light lens.
I am chillin inside, flying from a big TV.
SKY V2 Camera http://www.runcam.com/index.php?main_page=product_info&cPath=0&products_id=3
4mm f1.2 lens http://www.securitycamera2000.com/products/Low-Illumination-CCTV-Security-Camera-Lens-F1.2-4mm.html
VS
2.1mm wide lens.
M200 "Minion" Carbon Fiber Mini H Quad
TS832 600mw 5.8ghz Vtx
NAZE acro FC
KVOSD
ZMR 1804 2400kv motors
RCX 10A ESC Brushless Motor Speed Controller (G Series / Programed for Multicopter - SimonK Firmware)