220+ machine-vision filters — in stock, ready to ship.
Match the filter to the application — and the lighting.
Spec faster with data-driven selection tools.
Engineered, not just coated
A MidOpt filter isn’t a piece of colored glass — it’s an engineered optic built to hold its performance on a real factory floor, not just on a lab bench. Here’s what goes into one.
MidOpt’s proprietary coating approach that minimizes how much a filter’s passband shifts — and how much out-of-band light leaks in — as the angle of incidence increases.
Why it matters — Light in a real lens hits the filter at many angles, not just head-on. Ordinary bandpass filters shift toward shorter wavelengths and lose blocking at steep angles, so a system that looked perfect in the lab loses contrast on the floor. StablEDGE holds the passband stable across the working cone of angles.
Precision multilayer A/R coatings on the filter surfaces that maximize transmission and suppress surface reflections.
Why it matters — Every uncoated glass surface reflects light away from your sensor and bounces stray light back as ghosts and flare. A/R coatings push more of your signal through and keep the image clean — better signal-to-noise, sharper contrast.
A smooth, rounded (Gaussian-shaped) passband rather than a razor-steep “ideal” one.
Why it matters — Steep filters look great on a spec sheet but shift and clip with small changes in angle or temperature. A Gaussian passband degrades gracefully — the measured response stays predictable across the real conditions of a production line, which is what actually matters for repeatability.
Durable hard-oxide coatings — not soft or organic films — deposited on the glass.
Why it matters — Machine-vision filters live for years in hot, humid, dusty, vibrating environments and get wiped down repeatedly. Hard coatings resist scratches, moisture, and cleaning so performance doesn’t drift over the life of the system.
An oil- and fingerprint-repelling top layer (available on select filters).
Why it matters — On the line, lenses get touched and splattered. An oleophobic surface sheds oils and wipes clean in one pass — no smearing, no downtime.
Both faces polished to a 40-20 scratch-dig surface quality on double-side-polished glass.
Why it matters — Surface defects scatter light and show up as artifacts in high-resolution inspection. Tight surface quality keeps the wavefront clean so the filter adds clarity, never noise.
Tell us about your imaging problem — we’ll point you to the right filter.
