Lens mount developed by Nikon, typical used for line scan cameras
Archives
F-Number
= F-Stop = Aperture Value
F-Stop
F-Theta
F-Theta lenses are a class of Fisheye lenses
F-Theta lenses are also called “equidistant“, “linear scaled“, “äquidistant” or “angular”
F-Theta lenses use an image mapping function of type
Non distortion 180° F-Theta lenses have an image circle or mm
A non distortion F-Theta lens of 1.37mm focal length has an image circle of mm = mm
Therefor a f=3.17mm F-Theata lens with an image diameter for 180° of 4.15mm has a distortion of (4.15/4.3)-1 = 0.965-1 = -3.5%
Therefor a f=3.17mm F-Theata lens with an image diameter for 180° of 4.15mm has a distortion of (4.15/4.3)-1 = 0.965-1 = -3.5%
maintains angular distances
Type : F-Theta | weak | medium | strong | max |
---|---|---|---|---|
angles | 115° | 159° | 217° | 360° and more |
see
Fisheye Types