The image height of the scan lens. Mathematically, scan length can be defined as the product of the calibrated focal length (f ) and twice the field angle (2*q in radians) in object space: SL = 2*(Field Coverage) = f*2(q).
SPHERICAL VS. ASPHERIC LENSES
HOW THEY’RE USED IN IMAGING APPLICATIONS
Optical Lenses are often categorized by their shape. Two common surface shapes are spherical and aspherical. Each offers unique characteristics that make it suitable for different use cases.