Eyepiece F '= 20 mm with 40 mm eye relief

Eyepiece F'= 20 mm with 40 mm eye-relief

Parameter Value
Entrance pupil diameter, mm 2,0 (5,0)
Object size (diagonal), mm 10,06
Spectral range, μm 0,486-0,656
Main wavelength (λ0), μm 0,588
Focal length for λ0, mm 19,98
Aperture ratio 1:4,0
Field of view, 2ω, deg 29,0
Linear field in image space, 2y', mm 10,0
Eye relief, mm 40,0
Back (front) focal length, mm 6,1
Optical system length, mm 29,6
Maximum vignetting,% 43,9
Maximum distortion from a flat object, % -3,92

MTF (pupil 5 mm)

MTF (pupil 2 mm)