Hubsan H109S 4.35mm Camera Lens adaptor

This is the ring to install a 4.35mm 'gopro' style lens to the Hubsan H109s Camera. Lens are available in sites like aliexpress or ebay for a few euros.
These lens effectively reduce camera's field of view, thus reducing the barrel effect (a bit too pronounced in the stock lenses). The video quality will be also improved due to the improved quality lenses (stock camera uses cheap glass).

Standard GoPro lenses are 14mm in diameter, smaller than the diameter of the stock camera. When such lens