The Questions Serious Optics Buyers Ask — Answered Once, in Order

Why buyers ask: selection mistakes are the most expensive mistakes — everything downstream inherits them.

Start from five inputs: sensor format, working distance, field of view, resolution target, and environment. Convert sensor format and field of view into focal length, check the image circle, then filter by distortion budget and IP or sterilization needs. Our five-step guide walks the full method with worked examples and a decision table by inspection type. If you would rather have our engineers run the numbers, send your sensor model and geometry – a feasibility first-pass comes back within 48 hours.

Five-Step Selection Guide·Send Your Spec

Why buyers ask: a lens is only as good as its match to the sensor’s microlens array and filter stack.

Yes. We routinely match optics to sensors from 1/9-inch endoscope modules (OV9734, OV2740, ES101) up to 2/3-inch and 1.1-inch industrial formats. Send your sensor model, working distance, and field of view, and our engineers confirm the optical match and the achievable performance envelope – MTF, distortion, and depth of field included.

Contact an Engineer

Why buyers ask: mount choice locks the whole BOM — sensors, fixtures, and accessories.

M12 (S-mount) lenses thread directly onto board-level and embedded cameras; ours span 5-30 mm focal lengths with five fixed iris stops from F4.0 to F11 and FT full-thread lock focus for high-vibration installs. C-mount lenses serve larger formats up to 1.1 inch with the widest accessory ecosystem. The right choice depends on your sensor format, vibration exposure, and space budget – our two selection guides cover the math.

M12 Series·FA C-Mount Series·C vs CS Mount Guide

Why buyers ask: telecentric optics cost real money — and so does measuring wrong.

You need one when measured dimensions must stay constant as parts move in depth, or when you inspect thick objects that must keep the same magnification front to back. If parts sit at a fixed distance and tolerances are loose, a low-distortion FA lens is usually the smarter buy. Our telecentric explainer covers object-side, image-side, and bi-telecentric differences with selection guidance.

What Is a Telecentric Lens?·Telecentric YT Series

Why buyers ask: drawings leaked to third parties are the nightmare scenario.

We are a direct optical manufacturer. Lens design, precision machining, coating, cleanroom assembly, 1 um-class active alignment, and final metrology all run in-house – no outsourced core optical steps. You can verify this through the 29-photo factory gallery, two walkthrough videos, or an on-site or video audit.

Tour the Factory

Why buyers ask: the design is the asset — protection comes first.

Yes – an NDA is signed before any drawing, spec, or target image is exchanged, and our template is available on request. Customer tooling is stored free of charge for 5 years after the project, and custom design IP belongs to the customer. If you prefer your own NDA format, our engineers review and countersign it the same week.

Custom Optics Process

Why buyers ask: legacy products often outlived their documentation — and their supplier.

Yes. Reverse engineering from a physical sample or a target image is a standard service – we reconstruct the optical prescription, verify it against measured performance, then re-engineer it for manufacturability. This is a common path when the original supplier has disappeared or design files were never delivered.

Start From a Sample

Why buyers ask: one supplier who can do the odd job beats three who cannot.

Beyond the nine product lines, our engineers build micro projection light engines (DLP, UV 365/385/405 nm), UV exposure objectives (0.5 um class), 3D-printed telecentric lenses, reflective and acousto-optic spectrometer optics, and semiconductor laser modules. Feasibility starts with a technical call and a target-image or spec review under NDA.

Custom Optics & OEM

Why buyers ask: tooling and IP disputes poison long programs.

Customer tooling stays yours and is stored free of charge for 5 years. Custom design IP belongs to the customer – deliverables, usage rights and exclusivity are set in the project NDA and contract before design work starts.

Custom Optics Process

Why buyers ask: “quality control” claims mean nothing without method.

Every lens passes full-item testing: MTF, distortion, back focal length (BFL), depth of field (DOF), and IP67/IP68 verification where specified. The metrology floor runs Trioptics centering systems, a laser Fizeau interferometer, reflective centering instruments, a precision air-bearing stage, a UV spectrophotometer, and collimation systems. Each batch ships with documented results, not pass/fail claims alone.

Quality Assurance

Why buyers ask: the sample passed — will unit #9,000?

Three controls: closed-loop 1 um-class active alignment on every unit, defined sampling plans per batch, and batch test reports that ship with each lot. On the FA line this discipline holds distortion under 0.05% across 10K+ unit batches. It is the same quality culture our founders ran at Foxconn and Sunny Optical.

Batch Reports

Why buyers ask: paperwork that cannot pass internal QA is rework.

Each batch ships with a test report covering MTF, distortion, BFL, and DOF results, plus batch number, test conditions, and pass/fail judgment. Certificates of conformance and material statements are available on request. Redacted sample reports can be provided before you order.

Quality Assurance

Why medical buyers ask: a lens that fails after cycle 50 ends a product line.

Yes. Our medical endoscope objectives use hermetic sealing and autoclave-tolerant designs, validated by repeated high-temperature, high-pressure steam cycles with post-cycle MTF and sealing verification. Cycling parameters are shared during project discussions under NDA.

Endoscope Optics

Why buyers ask: project Gantt charts die in the lens line.

Prototype-to-mass-production and repeat-order schedules are confirmed per project at quotation. The program covers spec review, optical design with tolerance analysis, prototyping with a full test report, pilot run, and mass production.

The 60-Day Program

Why buyers ask: warehouse space and budget ceilings are real.

Catalog lines support low-MOQ sampling; sampling below standard MOQ is supported for evaluation. Custom optics are quoted per specification and program volume – tell us your annual quantity and we propose the most economical sampling and production split.

Request a Quote

Why buyers ask: cash-flow planning starts here.

Standard terms are 50% deposit and 50% before shipment by T/T. More flexible arrangements are discussed for long-term program partners.

Contact Us

Why first-time importers ask: Incoterms confusion causes real cost surprises.

Standard trade term is EXW, with Guangzhou as the loading port; FOB and other Incoterms can be arranged. Packaging and freight are confirmed per order.

Contact Us

Why buyers ask: sampling cost is the first budget line.

Catalog lenses can be sampled for evaluation – sample fees are credited back when your volume order ships. Custom optics are sampled through the prototype phase of the 60-working-day program; sample pricing depends on model and quantity.

Sample Request

Why buyers ask: teams are vetted, not websites.

Lensmind Optics is led by two co-founders: one with 20 years in optics, trained at Zhejiang University, with R&D and product management background at China Aerospace (CASC) and Hikvision; one with 26 years in optics with quality, procurement, and sales management at Asia Optical, Foxconn, LG Display, and Sunny Optical.

About Us

Why buyers ask: location decides audits, logistics, and time zones.

Our factory is in Lin’an District, Hangzhou, Zhejiang, and our office is in the Torch Development Zone, Zhongshan, Guangdong. One team and one quality system operate across both sites.

Contact & Directions

Why buyers ask: certificate walls often hide thin systems.

ISO 9001, obtained in 2024 – stated plainly, because it is the certification we hold. Quality beyond the certificate is documented through batch test reports rather than logo walls, and you are welcome to audit the system on-site or by video.

Quality System

Why buyers ask: export experience predicts paperwork smoothness.

North America is our core market, followed by Europe and Belt-and-Road regions. All business is B2B – we work with equipment manufacturers, medical and NDT brands, and system integrators, not retail consumers.

About Us

Why buyers ask: nobody likes shouting into a black hole.

Your inquiry is triaged by engineering-trained staff the same working day. A named human replies within one business day – confirmation, clarifying questions, or the requested catalog or report. Custom specs get a feasibility first-pass within 48 hours: sensor match, achievable performance envelope, and the path to a quotation.

Contact Us

Why buyers ask: nobody wants to look unprepared.

Five things speed up your first quote: sensor model and target size, working distance and field of view, target performance (MTF, distortion, IP rating, sterilization), environment conditions, and annual volume. Missing pieces are fine – our engineers ask the right questions back.

The Five-Point Checklist

Why buyers ask: seeing is believing — and due diligence wants feet on the floor.

Yes. We welcome on-site audits at our Hangzhou factory and scheduled video tours with the engineers who run the line. Start with the 29-photo factory gallery and two walkthrough videos on the Manufacturing page.

Factory Tour