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Basler C23-0824-5M machine vision lens
BaslerC-mount lenses
  • Rosepetal compatible
  • Recommended by AIS Vision

Basler Lens C23-0824-5M f8mm

C23-0824-5M

The Basler C23-0824-5M is a premium fixed focal length C-mount lens with an 8.06 mm focal length and F2.4–F16 aperture range, optimized for 5 MP sensors with a pixel pitch of 3.40 µm and a maximum sensor format of 2/3" (11 mm image circle). It delivers a center MTF of 0.77 at 90 LP/mm and 0.53 at 140 LP/mm (at F2.4, polychromatic, 0.45 m working distance), with typical optical distortion of 1.87% and a minimum focus distance of 100 mm. Designed for the visible wavelength range (400–700 nm), the lens features manual focus and iris control, weighs approximately 89.5 g, and has a 45.1 mm body length with an M35.5×0.5 filter thread.

Brand
Basler
Focal length
8 mm
Lens mount
C-mount
Aperture (f-number)
F2.4–F16
Image circle / max sensor
11 mm (2/3")
Optical resolution
5 MP
Telecentric
No
Working distance
100 mm to infinity
Weight
89.5 g
Operating temperature
-10 to 50°C
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Technical overview

The Basler C23-0824-5M is an 8.06 mm fixed focal length C-mount lens engineered specifically around 5 MP sensors with a 3.40 µm pixel pitch, delivering an 11 mm image circle that fills a 2/3" sensor format without vignetting. For installers, the 8 mm focal length produces a wide-angle perspective relative to most industrial sensor formats, making it well suited to close-range scenes where a large field of view must be captured in a compact camera-to-subject envelope. The minimum focus distance of 100 mm defines the closest working position; beyond that the lens focuses to infinity, giving flexibility across conveyor heights, robot-mounted brackets, and fixed inspection stations. The aperture range of F2.4 to F16 gives the system integrator meaningful control over depth of field and light throughput: opening to F2.4 maximises sensor illumination in dimly lit environments or enables shorter strobe durations, while stopping down to F8–F16 deepens the focal plane for parts with significant height variation at the cost of requiring brighter structured or diffuse lighting.

Optical performance is quantified by a center MTF of 0.77 at 90 LP/mm and 0.53 at 140 LP/mm, measured polychromatically at F2.4 and 0.45 m working distance. At 3.40 µm pixel pitch the Nyquist limit of the paired 5 MP sensor sits near 147 LP/mm, meaning the lens resolves contrast close to the sensor's theoretical ceiling under polychromatic visible light (400–700 nm). Typical optical distortion of 1.87% is the key accuracy parameter for dimensional measurement: at this level, software-based distortion correction is advisable before making calibrated measurements, particularly near the image periphery. The lens is not telecentric, so perspective error will increase as the working distance departs from the calibration distance — this is an important consideration for height-variant parts or gauging tasks where absolute dimensional accuracy is required. For inspection tasks that do not require absolute measurement (defect detection, code reading, surface grading), the distortion level is generally acceptable without correction.

Mechanically, the C23-0824-5M uses a standard C-mount thread, keeping it compatible with the broad installed base of C-mount industrial cameras from Basler and other manufacturers equipped with 2/3" or smaller sensors. Manual focus and iris rings allow in-situ adjustment during commissioning without any powered interface. The M35.5×0.5 filter thread accommodates bandpass, polarising, or ND filters, which matters when pairing with specific LED wavelengths or managing ambient light rejection on a line. At 89.5 g and 45.1 mm body length, the lens is compact enough for dense multi-camera arrays and robot end-of-arm tooling. The operating temperature range of −10 to 50 °C covers standard factory floor and warehouse environments without requiring thermal management, though applications near ovens, freezers, or outdoor installations approaching those limits should be verified against the full assembly thermal budget.

Best for

  • Close-range surface and defect inspection on conveyors where a wide field of view at 100–500 mm working distance must be resolved at 5 MP detail — for example, label print quality, packaging seal integrity, or tablet surface grading in pharma lines.
  • Barcode, Data Matrix, and QR traceability reading where the 8 mm focal length provides a generous code-capture area and the F2.4 aperture supports short strobe exposures to freeze fast-moving parts on logistics or electronics assembly lines.
  • Robot guidance and pick-and-place vision where a compact, lightweight optic on a 2/3" C-mount camera is mounted to the robot arm, and the wide angle of view accommodates position variation within the robot workspace.
  • General-purpose machine vision setups on 5 MP GigE or USB3 Vision cameras in electronics, automotive, and semiconductor inspection where a single versatile lens must cover multiple inspection stations or product variants during line changeovers.
  • Food and beverage packaging inspection — cap presence, fill level estimation, label placement — where visible-spectrum imaging under white or broad-spectrum LED domes pairs naturally with this lens's 400–700 nm design range.

Selection notes

  • Sensor format compatibility is the first gate: the 11 mm image circle covers 2/3" sensors fully, and it will also cover smaller formats (1/1.8", 1/2", 1/3") with corresponding increases in magnification and reduction in field of view. Do not use this lens on cameras with sensors larger than 2/3" — corner shading and optical degradation will result.
  • Distortion at 1.87% requires attention for dimensional measurement applications. If length, width, or diameter tolerances tighter than roughly ±0.5% of the field width are needed, plan to perform a lens distortion calibration using a dot-grid or checkerboard target and apply per-pixel correction in the vision software before measurement routines.
  • The lens is not telecentric: object-to-lens distance variations will change the apparent size of features. For gauging on parts with height variation greater than a few millimetres, either constrain part presentation mechanically or switch to a telecentric objective to eliminate perspective-induced measurement error.
  • Filter thread M35.5×0.5 enables bandpass or polarising filters. When pairing with narrowband LED lighting outside the visible range, note that this lens is optimised for the visible range 400–700 nm — focus shift at near-infrared wavelengths will require refocusing and may reduce edge sharpness. Use a visible-spectrum LED source for best MTF.
  • Working distance planning: the minimum focus distance of 100 mm constrains the closest camera mounting position. At very short working distances near 100 mm on a 5 MP 2/3" sensor, the field of view will be small, so verify the FOV calculation against the part size before mounting brackets are fabricated.

Specifications: General
BrandBasler

Specifications: Optical
Focal length8 mm
Lens mountC-mount
Aperture (f-number)F2.4–F16
Image circle / max sensor11 mm (2/3")
Optical resolution5 MP
TelecentricNo
Working distance100 mm to infinity

Specifications: Environment
Operating temperature-10 to 50°C

Specifications: Mechanical
Weight89.5 g

Frequently asked questions

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