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MidOpt technology
A bandpass filter only does its job if it holds its passband at the angles light actually hits it. StablEDGE is how MidOpt keeps it stable.
Every interference filter is tuned for light arriving head-on (0°). But inside a real lens, light reaches the filter across a cone of angles. As that angle grows, an ordinary bandpass filter shifts toward shorter wavelengths and starts leaking out-of-band light — the passband narrows, moves, and collapses.
On a short focal-length lens, the difference between 0° and the edge of the cone can be the difference between a system that works and one that doesn’t.
StablEDGE is a coating and design approach that minimizes how far the passband moves and how much out-of-band light leaks in as the angle of incidence increases.
The result: the filter holds its center wavelength and blocking across the working cone of angles, so your contrast and signal-to-noise stay where you set them — in the lab and on the floor.
See the AOI overlay on a filter page
Minimal center-wavelength shift as the angle of incidence increases.
Out-of-band light stays blocked at steep angles, not just at 0°.
The measured response on the floor matches what you specified.
Start from your light source or compare curves — we’ll help you choose.