The 3Z4S-LE VS-TCH05-65-O is a straight-type, high-resolution telecentric lens designed for 2/3" C-mount megapixel machine vision cameras. It delivers 0.5x magnification at a 75.3 mm working distance (153.3 mm total object-to-image distance) with an effective F-number of 9.42 and numerical aperture of 0.027. TV distortion is exceptionally low at 0.02% maximum, making it ideal for dimensional measurement applications. The lens covers a field of view of approximately 16.8 × 14.2 mm on a 2/3" sensor and provides 3.0 mm depth of field with 94% relative illuminance across the visible spectrum (400–700 nm).
Brand
Omron / Sentech
Lens mount
C-mount
Magnification
0.5x
Working distance
75.3 mm
Aperture (f-number)
F9.42
Image circle / max sensor
2/3" (11 mm)
Optical resolution
Not specified by manufacturer; spatial resolution is 12.43 μm
The Omron 3Z4S-LE VS-TCH05-65-O is a straight-type, object-space telecentric lens delivering 0.5x magnification at a fixed 75.3 mm working distance, with a total object-to-image distance of 153.3 mm. Its C-mount interface and 11 mm (2/3") image circle make it a direct fit for the megapixel area-scan cameras most commonly used in gauging and precision inspection stations. At F9.42 (numerical aperture 0.027), the effective aperture is deliberately stopped down to achieve maximum depth of field — 3.0 mm — while preserving the near-telecentric ray geometry that is the optical precondition for accurate, parallax-free dimensional measurement. Installers can use this depth of field budget to tolerate modest part-height variation or fixture repeatability error without recalibration.
The headline specification for a gauging lens is TV distortion, and the VS-TCH05-65-O holds this to a maximum of 0.02% across the full 2/3" image circle. In practical terms, over a 16.8 mm horizontal field of view, 0.02% distortion corresponds to less than 3.4 µm of geometric error at the object plane — far below the pixel pitch of any 2/3" sensor used with this lens. The spatial resolution of 12.43 µm at 550 nm wavelength (covering the full visible band from 400 to 700 nm) means the lens can resolve detail finer than most sensor pixels, so optical resolution is not the limiting factor in a well-engineered system. Relative illuminance across the image circle is 94%, so edge-of-field vignetting is negligible and threshold-based measurement algorithms will behave consistently from image centre to corner.
At 70 g and Ø32 mm × 60.5 mm, the lens is compact enough for integration into multi-camera fixture arrays or tight enclosure designs. The straight-type form factor (as opposed to coaxial or right-angle variants) suits conventional front-lit or dome-lit layouts where the camera axis is perpendicular to the part surface. With a 75.3 mm working distance, there is practical clearance for ring lights, structured-light projectors, or low-profile back-light panels beneath the lens barrel. Because the working distance is fixed — telecentricity depends on maintaining the designed conjugate distances — installers must specify a rigid, fixed-height mount; no focus adjustment is provided or required once the system is set at the correct object plane.
Best for
Sub-pixel dimensional gauging of machined or stamped metal parts where edge-location accuracy demands less than 0.02% distortion across the field
Electronic component inspection on 2/3" megapixel cameras — lead coplanarity, pad pitch, and connector pin measurement at 0.5x magnification over a ~16.8 × 14.2 mm field
Pharmaceutical tablet and capsule dimensional verification on continuous or indexed conveyors, where the 3.0 mm depth of field absorbs minor height variation between units
Semiconductor wafer and substrate feature measurement in front-end or back-end-of-line stations requiring parallax-free imaging across a flat, fixed-height object plane
Precision OCR and 2D data-matrix reading on label or laser-marked parts where character geometry must be measured as well as decoded
Selection notes
Camera compatibility: the lens is designed for 2/3" C-mount megapixel sensors. Using it with a smaller sensor (e.g., 1/2") will crop the field but retain the telecentric and distortion performance; using it with a sensor larger than 2/3" will introduce vignetting at the corners because the 11 mm image circle will not cover the full sensor diagonal.
Fixed working distance: telecentricity requires operation at exactly 75.3 mm object distance. Any deviation — due to part height variation, bracket flex, or vibration — moves the object outside the calibrated conjugate and degrades both magnification constancy and distortion. Verify that fixture and mounting rigidity hold the object plane within the 3.0 mm stated depth of field.
Lighting pairing: at F9.42, the lens admits less light than a typical machine-vision prime. Back-lighting (silhouette mode) is the natural complement for edge-based gauging; if surface or reflected-light inspection is required, a high-intensity dome or co-axial illuminator is preferred over a ring light to maintain even illuminance given the 94% relative illuminance already achieved by the lens design.
No iris adjustment: the effective F-number is fixed at 9.42. Exposure must be managed entirely through lighting intensity, camera gain, or integration time — there is no variable aperture to adjust. This eliminates a source of recalibration error but means the system must be designed with adequate illumination headroom from the outset.
Wavelength range: the optical performance data (resolution, distortion, illuminance) is specified across 400–700 nm visible light. If near-infrared illumination is required for a specific application, verify with Omron whether the lens performance remains within tolerance at those wavelengths, as apochromatic correction and anti-reflection coatings are designed for the visible band.
Specifications: General
Brand
Omron / Sentech
Specifications: Optical
Lens mount
C-mount
Magnification
0.5x
Working distance
75.3 mm
Aperture (f-number)
F9.42
Image circle / max sensor
2/3" (11 mm)
Optical resolution
Not specified by manufacturer; spatial resolution is 12.43 μm
Telecentric
Yes
Specifications: Mechanical
Weight
70 g
Dimensions
Φ32 mm × L 60.5 mm
Applications this camera is commonly selected for. Open one to see the full recommended hardware and approach.
Matched automatically by: camera mount fits the lens mount · camera sensor is covered by the lens image circle — this lens: C-mount · 2/3" (11 mm) image circle.
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These steps take an Omron Sentech (STC) camera from the box to a stable first image and on to your own application. They apply across the GigE Vision, USB3 Vision and CoaXPress STC families; the interface only changes how you cable and power the camera.
Download and install the Sentech SDK on the host PC. The package provides StViewer, the viewing and configuration software you use to bring the camera up, and StApi, the programming SDK you integrate later. Because the cameras are GenICam/GenTL-compliant, StApi also registers a GenTL producer, so any GenICam-compliant third-party vision software can discover and drive the camera as an alternative front end.
2. Cable, power and connect the camera
Connect according to the interface. GigE Vision: link to a Gigabit NIC (use PoE or the separate power input) and put the camera and host on the same subnet; for USB3 Vision use a USB 3.x port and a certified cable; for CoaXPress (STC) connect to a CoaXPress frame grabber, which also supplies Power-over-Coax. Then open StViewer and let it enumerate the camera. If a GigE camera does not appear, check the IP configuration and firewall, and on USB3 confirm the host bandwidth and driver.
3. Configure exposure, gain and white balance
Open the device in StViewer and start a live stream. Set exposure and gain for a well-exposed, low-noise image: raise exposure first and only add gain when more light or a faster shutter is not an option, keeping exposure short enough to freeze motion on global-shutter models. On colour cameras, run white balance under your actual production lighting. Adjust the lens aperture and focus on a representative target before tuning anything else.
4. Set the trigger and grab a first image
Start in free-run (continuous) acquisition to confirm a clean, stable image. For inline inspection switch to hardware or software triggering: select the trigger source, set the active edge and any delay, and wire the strobe or illumination to the camera's I/O so lighting fires with each exposure. Acquire and save a frame in StViewer; this saved image is your reference for the SDK stage and for downstream inspection.
5. Move to the StApi SDK (or any GenICam software)
Once the image is stable, reproduce the same settings in code. Use StApi to open the device, apply the GenICam features you validated in StViewer (exposure, gain, trigger, pixel format) and grab frames into your application via the bundled C++, C, C#/.NET or Python interfaces; the included samples are the fastest starting point. Prefer a different stack? The same GenICam/GenTL camera works with third-party vision libraries. With a reliable feed, you can route it into a deep-learning inspection such as Rosepetal for AI-based defect detection.
Frequently asked questions
The lens is designed for 2/3" sensors with an 11 mm image circle. It will cover 2/3" sensors fully. Smaller formats (1/2", 1/3") will be fully covered with a cropped field of view. Sensors larger than 2/3" — such as 1" or 4/3" — will see vignetting in the corners because the image circle does not extend beyond 11 mm diameter.
At 0.5x magnification on a 2/3" sensor, the field of view is approximately 16.8 mm × 14.2 mm at the 75.3 mm working distance. The exact field on a specific camera depends on that camera's sensor pixel pitch and array dimensions.
No. This is a fixed-focus telecentric lens; the working distance of 75.3 mm is determined by the optical design and cannot be altered without destroying the telecentric ray geometry and degrading distortion performance. The 0.5x magnification and the 16.8 × 14.2 mm field of view are fixed consequences of operating at the correct conjugate distance.
The specified depth of field is 3.0 mm. Parts or fixtures that keep the object surface within ±1.5 mm of the nominal 75.3 mm working distance will remain within the depth of field. Outside this range, both focus sharpness and the telecentric magnification constancy will degrade, introducing measurement error.
Yes, for typical 2/3" megapixel cameras. Over the 16.8 mm horizontal field, 0.02% corresponds to roughly 3.4 µm of geometric error at the object plane. Sub-pixel edge-detection algorithms operating on such a system are not limited by lens distortion.
