Q1: What is the BTLM 2/3" Series used for?
A: The BTLM 2/3" bi-telecentric lens series is designed for high-precision machine vision, metrology, AOI, and semiconductor inspection applications requiring ultra-low distortion imaging.
Q2: What sensor size is this lens compatible with?
A: It is optimized for 2/3" industrial area scan cameras (Φ11mm image circle).
Q3: What is the magnification range of this series?
A: The BTLM 2/3" Series supports magnifications from 0.166X to 0.5X, suitable for both wide-field and precision inspection tasks.
Q4: What is the advantage of a bi-telecentric design?
A: A bi-telecentric lens maintains constant magnification and zero perspective error, ensuring highly accurate and repeatable measurements.
Q5: How accurate is this lens in terms of distortion?
A: The series achieves ultra-low distortion (<0.03%–<0.1%), making it ideal for precision metrology applications.
Q6: What is the difference between standard and “D” models?
A: “D” models include coaxial illumination compatibility, making them suitable for reflective or low-contrast surfaces.
Q7: What working distances are available?
A: Depending on the model, working distances range from 65 mm to 173 mm.
Q8: What industries commonly use this lens?
A: It is widely used in semiconductor inspection, electronics manufacturing, PCB inspection, AOI systems, and industrial automation.
Estimated Delivery Time
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Shipping dates are estimates and subject to change. By ordering, you accept possible schedule adjustments. For urgent orders, please confirm with us before purchasing. Post-order cancellations are subject to a 6.4% handling fee.
Description
Product Description
High-Precision 2/3" Bi-Telecentric Lenses for Industrial Measurement and Machine Vision
The BTLM 2/3" Series bi-telecentric lenses are engineered for high-accuracy machine vision and metrology applications, offering ultra-stable imaging performance with zero perspective error across the entire field of view.
Designed specifically for 2/3" industrial area scan cameras (Φ11mm sensor support), this series provides multiple magnification options from 0.166X to 0.5X, making it ideal for both wide-field inspection and precision measurement tasks.
With ultra-low distortion (<0.1% / <0.03% depending on model), high telecentricity (<0.1°), and MTF performance exceeding 160–260 lp/mm, the BTLM series ensures extremely sharp and repeatable imaging results in demanding industrial environments.
Optional coaxial illumination versions (D models) are available for reflective surfaces, while manual iris options enable flexible depth-of-field control in complex inspection conditions.
Key Features
✔ Optimized for 2/3" Sensors (Φ11mm Image Circle)
Perfect match for high-resolution industrial area scan cameras.
✔ Wide Magnification Range (0.166X–0.5X)
Flexible configuration for different inspection fields of view.
✔ Ultra-High Optical Resolution (MTF >160–260 lp/mm)
Ensures sharp detail capture for precision metrology.
✔ Ultra-Low Distortion (<0.03%–<0.1%)
Provides highly accurate geometric measurement.
✔ Zero Perspective Error Design
Ensures stable and repeatable measurement accuracy.
✔ Optional Coaxial Illumination Versions (D Models)
Ideal for reflective or low-contrast surfaces.
✔ Long Working Distance Design (65–173mm)
Flexible integration into industrial inspection systems.
✔ Optional Manual Iris (Selected Models)
Allows depth of field optimization and image tuning.
Ideal Applications
- Precision Metrology
- Semiconductor Inspection
- Electronics Manufacturing
- PCB Inspection
- Automated Optical Inspection (AOI)
- Dimensional Measurement Systems
- Industrial Quality Control
- High-Accuracy Machine Vision Systems
- Reflective Surface Inspection (Coaxial Models)
Specifications
2/3" C-Mount Telecentric Lens
| Model | Variable Iris | Coaxial | Mag | WD (mm) | F/# | MTF30 (lp/mm) |
|---|---|---|---|---|---|---|
| BTLM-0.5X-65-23 | No | No | 0.5X | 65±1 | 5.0 | >160 |
| BTLM-0.5X-65D-23 | No | Yes | 0.5X | 65±1 | 5.0 | >160 |
| BTLM-0.4X-85-23 | No | No | 0.4X | 85±2 | 4.5 | >205 |
| BTLM-0.4X-85D-23 | No | Yes | 0.4X | 85±2 | 4.5 | >205 |
| BTLM-0.166X-173-23 (IA) | Yes | No | 0.166X | 173±3 | 3.3 | >260 |
Warm tips：The above DOF is just theoretical value at the ideal aperture (eg. ±763@F11). Actual DOF or the DOF what you need, please check with our sales engineer before order cfm.
Telecentric Lenses Download
Return and Exchange Policy
Please review our return and exchange policy carefully before placing your order. We encourage all customers to confirm product specifications and application requirements before purchase.
1. Return and Exchange Eligibility
Contrastech accepts return or exchange requests only for product defects or quality issues, subject to review and confirmation.
Returns or exchanges for reasons unrelated to product defects or quality issues are generally not accepted, subject to applicable law.
2. Non-Eligible Return and Exchange Requests
Before placing an order, customers are responsible for confirming that the selected product meets their technical requirements and is suitable for their intended application. Customers are also responsible for evaluating product compatibility with their systems and use cases.
Requests based on the following reasons are generally not eligible:
- Misunderstanding product specifications or selecting the wrong product.
- Product incompatibility with the customer's intended application.
- Personal dissatisfaction unrelated to a confirmed product defect or quality issue.
These limitations are subject to any mandatory rights or remedies available under applicable law.
3. Product Quality and Claim Period
Our products undergo quality control and quality assurance inspections before shipment. However, if a product you receive is damaged, defective, or materially inconsistent with its published description, please contact us within 3 business days of receipt to report the issue.
Important: Please provide your order number, a description of the issue, and relevant photos or videos where available. This information helps our team assess your claim efficiently.
Our team will review the information provided and advise you on the next steps. Please do not return any product before receiving return instructions from our team.
The stated reporting period does not limit any non-waivable rights you may have under applicable law.
4. Refund Processing and Transaction Fees
For return or refund requests that meet our eligibility requirements, we will process the refund within 1 business day after approval.
Please note that a 6.4% transaction processing fee charged by the payment platform is non-refundable and may be deducted from the refund amount, where permitted by applicable law and the relevant payment provider's terms.
The actual time required for the refunded amount to appear in your account may vary depending on your payment provider or bank.
Need Assistance?
If you have questions about our return and exchange policy or need to report a product quality issue, please contact our team.
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