Q：How to choose the right manufacturer of telecentric lenses?

A：When selecting a supplier of telecentric lenses, the key priority should be to ensure that the optical parameters, delivery capacity and after-sales calibration services are well-suited to the specific testing conditions; simply comparing prices can very easily result in imaging performance that fails to meet standards.

I. Verifying That Optical Parameters Are Suitable for the Inspection Requirements

The first step in selecting a lens is not to request a quotation directly from the manufacturer, but to analyse your own application requirements. These include the dimensions of the object to be inspected, the working distance range, the required field of view, accuracy requirements, and the camera sensor specifications. Telecentric lenses are divided into three categories: object-side telecentric, image-side telecentric and dual-telecentric; there are significant differences between these types in terms of distortion control and depth of field performance. For high-precision dimensional measurement applications, double-telecentric lenses should be the first choice; for外观 defect inspection, object-side telecentric lenses may be selected depending on the required level of accuracy. At the same time, particular attention should be paid to distortion and parallelism specifications. Misrepresentation of technical parameters is a common issue in the industry; therefore, before placing an order, you should request actual imaging samples to avoid the need for repeated fine-tuning once the lens is installed.

II. Verifying Production and Delivery Capabilities

Once parameter compatibility has been confirmed, the manufacturer’s mass production capabilities should be assessed. Lead times for small-batch sample orders are relatively flexible, whereas for long-term, high-volume procurement for automated production lines, it is necessary to verify the stability of production capacity. Attention should also be paid to the lens component supply chain; products with in-house developed optical structures offer better consistency control than assembled, private-label products, resulting in less variation in image quality during high-volume use.

III. Prioritising Supporting Technical Services

Telecentric lenses require a light source and a camera to complete a full vision system; a reputable supplier will be able to offer advice on optical configuration. During long-term use, impacts to the lens and temperature fluctuations may affect its accuracy; manufacturers with lens calibration and repair capabilities can help minimise the costs associated with equipment downtime. Suppliers who merely sell products without providing technical support will find it difficult to resolve on-site commissioning issues promptly.

IV. Taking a Rational View of Procurement Prices

There is a significant cost difference between telecentric lenses of different accuracy grades; one should not simply pursue the lowest price. Low-cost products often cut corners on lens materials and machining tolerances, which can lead to accuracy drift during long-term operation, resulting in defects being missed on the production line and, consequently, increased production costs.

Industry research data indicates that over 63 per cent of vision system commissioning failures stem from a mismatch between the selected lens and the operating conditions; approximately 51 per cent of companies report that, having initially compared prices alone, they subsequently incurred additional costs for commissioning and equipment replacement. Only by screening suppliers across the three key dimensions of parameter compatibility, lead times and technical support can one select a telecentric lens that is suitable for the production line.