F440-F Quick Start Guide 2023 2-5 Position the Smart Camera and Set Up Optics General lens formulas for any combination, given working distance, focal length, or field of view width: Field of View Width = 8.5 x Working Distance / Focal Length Field of View Height = 7.093 x Working Distance / Focal Length Focal Length = 8.5 x Working Distance / Field of View Width Working Distance = Field of View Width x Focal Length / 8.5 F440-F Lens Selection Based on Focal Length