The field angle w is determined by the sensor length S, the focal length f and magnification β:
{!{!{w=arctan\left(\frac{S}{2\cdot f\cdot (1+\beta)}\right)}!}!}
The field angle is used for calculating the edge intensity.Field angle
Lens parameters scheme
Imaging Parameters
Schematic depiction of the imaging system and definition of variables used.
f = Lens focal length (mm)
S = Sensor length (mm)
L = Length of Region of Interest (ROI) of object (mm)
a = Object range (mm)
a’ = Image distance: Distance from sensor to HH’ (mm)
β = Magnification
w = Field angle
OO’ = Distance from sensor to measured zone (mm)
s’A = Flange focal length (mm)
∆s’ = Lens extension (mm)
LT = Tube length
A = Working distance (mm)
HH’ = Principal point distance (mm) (can lengthen or shorten OO’)
s’K = Camera flange length consisting of focus adapter series FA22 and extension rings series ZR (mm)
LO = Lens length (mm)