Skip to content

Basler Lens C23-2518-5M-P#

Basler Premium C-mount lens with a fixed focal length of 25 mm, aperture range from F1.8–F16, and a resolution of 5 MP.

Basler Lens C23-2518-5M-P F1.8 f25.0 mm

Key Features#

  • Fits all Basler cameras with a sensor size of up to 2/3"
  • Basler Premium Lens
  • Metal housing
  • C-mount
  • Locking screws for iris and focus
  • High contrast


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 2200000571
Focal Length f' 24.9 mm ± 5 %
Aperture Range F1.8–F16
Aperture with Highest Resolution F2.4
Image Circle 11 mm (2/3" format)
Focus Range 0.2 m to infinity
Optimum Working Distance 0.5 m
Relative Illumination at Full Aperture 63 %
Resolution Designed for 147 LP/mm (3.40 µm pixel size, see Resolution versus Image Height)
MTF Measured in the Center at 90 LP/mm / 140 LP/mm (conditions: F1.8, polychromatic, 0.45 m working distance) 0.54 / 0.43
MTF Measured in the Corner at 90 LP/mm / 140 LP/mm (conditions: F1.8, polychromatic, 0.45 m working distance) 0.51 / 0.4
Optical Distortion Typical 0.92 %
Angle of View, 1/1.8" Format Horizontal: 16.3°
Vertical: 12.1°
Angle of View, 2/3" Format Horizontal: 20.0°
Vertical: 15.0°
Wavelength Range Visible (400–700 nm)
Back Focal Length, s'F 13.20 mm

→ See Terminology (Basler Lenses).

Mechanical Specifications#

Flange Back 17.526 mm
Mount C-mount
Weight Approx. 62.0 g
Focus/Iris Operation Manual

Lens Dimensions#

Basler Lens C23-2518-5M-P

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

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 10–90 % relative humidity, non-condensing
Temperature During Storage -20–60 °C (-4–140 °F)

Performance Chart#

Resolution versus Image Height#

Conditions: f/1.8, polychromatic, 0.45 m working distance

Resolution versus Image Height

Precautions, Mounting, and Cleaning (Basler Lenses)#

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

Back to top