This is true 125° FOV (h) FPV 2.1mm glass lens replacement for FPV pilots using 1177 1/3" FPV Cams provides 125°FOV sharp with excellent colour. We found in the market ATM there are a lot of lenses that claim a certain focal length but are actually nothing close. These are tested on the 1177 camera (1/3" CCD) by us and give a measured FOV of 125°. Why so wide angle ? For FPV turns not being able to see to the side makes turning very difficult and un-predictable - using a wider lens allows you to "see" to the side as you do when driving your car/bike, so these wider lenses are preferred by pilots wanting wider peripheral vision.