Original Foxeer Replacement Camera Lens 1.7mm M8 Lens/5mp 1.8/2.1/2.5mm M12 Wide Angle Lens For Arrow/predator/falkor Camera - Parts & Accs - AliExpress
FPV Camera Lens Explained: FOV, Size and Image Quality - Oscar Liang
Vazen Full Frame 1.8x Anamorphic Lens Set with Hard Case VZPLKIT
Wide angle 1.8x anamorphic lens for full frame sensors launched by Vazen: Digital Photography Review
1.8mm lens vs 2.5mm lens comparation FOV - YouTube