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Basler Lens C125-1620-5M-P#

Basler Premium C-mount lens with a fixed focal length of 16 mm, aperture range from F2.0–F22, and a resolution of 5 MP.

Basler Lens C125-1620-5M-P F2.0 f16 mm

Key Features#

  • Fits all Basler cameras with a sensor size of up to 1/2"
  • Metal housing
  • C-mount
  • Low ghosting and veiling glare
  • High contrast
  • Locking screws for iris and focus
  • Aperture indicators on iris ring and lens barrel
  • Accurate focusing mechanism


The technical data shown in the following sections are nominal design values. The real values of the delivered products can deviate from the nominal design values.

General Specifications#

Order Number 2000034834
Focal Length f' 16 mm ± 5 %
Aperture Range F2.0–F22
Image Circle 7.3 mm (1/2.5" format)
Focus Range 0.2 m to infinity
Optimum Working Distance 0.5 m
Optimum Magnification 0.031
Relative Illumination at Full Aperture At least 55 % (see Relative Illumination versus Image Height)
Resolution (25 % MTF, Center, Full Aperture) Designed for 230 LP/mm (2.2 µm pixel size, see Resolution versus Image Height)
Resolution at 5.8 mm Image Diagonal
(80 % of a Basler acA2500-14gm/c camera or a Basler acA2500-14um/c camera)
At least 50 % of resolution in image center
Optical Distortion Typical -1 % (barrel distortion, see Distortion versus Image Height)
Angle of View, 1/2.5" Format (using a Basler acA2500-14gm/c camera or a Basler acA2500-14um/c camera) Horizontal: 19.5° (@ MOD) to 20.3°
Vertical: 14.6° (@ MOD) to 15.3°
Angle of View, 1/3" Format (using a Basler acA1300-30gm/c camera or a Basler acA1300-30um/c camera) Horizontal: 16.6° (@ MOD) to 17.3°
Vertical: 12.4° (@ MOD) to 12.9°
Wavelength Range Visible (400–700 nm, see Transmittance)
Pupil Magnification, ß'P 1.78
Chief Ray Angle, CRA 7.3°
Front Focal Length, sF 9.85 mm
Back Focal Length, s'F 15.96 mm
Principal Point Separation, HH' 4.84 mm
Entrance Pupil Position, sEP 18.82 mm
Exit Pupil Position, s'AP -12.60 mm
Overall Optical Length, d 30.74 mm

→ See Terminology (Basler Lenses).

Mechanical Specifications#

Flange Back 17.526 mm +0/-0.2 mm
Mount C-mount
Weight Approx. 60 g
Focus/Iris Operation Manual
Operating angle: 960°

Lens Dimensions#

Basler Lens C125-1620-5M-P

→ Download the CAD/technical drawing for your Basler Lens.

Precautions, Mounting, and Cleaning (Basler Lenses)#

→ See Precautions, Mounting, and Cleaning (Basler Lenses).

Environmental Requirements#

Temperature During Operation -10–50 °C (14–122 °F)
(For best results, adjust the focus when a steady operating temperature has been reached.)
Humidity During Operation 35–90 % relative humidity, non-condensing
Temperature During Storage -20–60 °C (-4–140 °F)
Humidity During Storage 35–90 % relative humidity, non-condensing

Performance Charts#

Relative Illumination versus Image Height#

Relative Illumination versus Image Height

Distortion versus Image Height#

Distortion versus Image Height



Resolution versus Image Height#

Conditions: f/2.0, polychromatic, 0.5 m working distance

Resolution versus Image Height

Sample Images#


  • The following images illustrate the typical image quality of this lens. The quality of the delivered product can vary.
  • The images were taken with a Basler acA2500-14gc or a Basler acA2500-14gm camera.

Image with Magnified Sections#

  • Conditions: f/2.8, 0.5 m working distance, 5 MP image (full resolution)

Example Image 1

Image of USAF1951 with Target Placed in the Center#

  • Conditions: f/2.8, white backlight illumination, 0.5 m working distance
  • The image center is cropped and magnified.

USAF1951 Target, Center

Image of USAF1951 with Target Placed in the Corner#

  • Conditions: f/2.8, white backlight illumination, 0.5 m working distance
  • The image corner is cropped and magnified.

USAF1951 Target, Corner