Zoom lens LWIR F '= 25-225 mm F#/ 1.5
Parameter Value
Spectral range, μm 8 - 12
Main wavelength (λ0), μm 10
Minimum focal length at λ0, mm 25,0
Maximum focal length at λ0, mm 225,0
Aperture ratio 1:1.5
Back focal length, mm 43,4
Image plane Fixed throughout focal range
Optical system length, mm 182,1
Minimum field of view, 2ω, deg 3,5
Maximum field of view, 2ω, deg 30,9
Linear field in image space, 2y ', mm 13,8
Maximum distortion,% -2,70
The minimum distance to the object, m 3 m (f '= 25 mm)
30 m (f '= 225 mm)
Operating temperature range, degrees Celsius -30+60

    25

MTF for a focal length of 25 mm

    141

MTF for a focal length of 141 mm

    225

MTF for a focal length of 225 mm