JSD2112 2.16mm M12 Lens - 181 deg FOV Ultra-Wide 5MP, F1.2
JSD2112 2.16mm F1.2 M12 Lens: Specifying an Ultra-Wide 5MP Lens for 1/2.7" and 1/2.8" Sensors
A 17.41 mm track length, two documented field-of-view configurations and a measured distortion figure decide whether a panoramic camera module can be built as drawn.
Key takeaway: The JSD2112 is a 2.16 mm fixed-focal M12 lens designed for 5MP sensors in the 1/2.7" and 1/2.8" classes. What makes it usable in a housing drawing is the way its data is published: two complete field-of-view triplets instead of one headline angle, a fixed 17.41 mm track, and distortion measured below -3.17 percent. Those three values let a housing depth, a lens-holder drawing and a dewarp profile be fixed in the same design pass.
What makes an ultra-wide lens hard to integrate
A panoramic camera module looks straightforward on a block diagram: one sensor, one lens, one image pipeline. On the bench it usually is. In production the difficulty arrives from the lens, and it arrives in three places at once.
The first is the mechanical envelope. Every millimetre of total track length is paid for in housing volume, and a wide field of view normally needs a long front group. Teams meet this constraint after the enclosure tooling is cut, when an assembly that renders cleanly on the bench will not sit inside the product.
The second is geometry. A field-of-view figure is only a specification once the axis it was measured on is stated. Diagonal, horizontal and vertical values for the same lens can differ by more than forty degrees, so reading one number as another puts the coverage calculation for a room, a vehicle or a production cell wrong before a single frame is captured.
The third is the interaction between distortion and the pipeline behind it. An ultra-wide lens supplied without a documented barrel profile pushes optical characterisation onto the software team. That work is repeatable, but it lands on the critical path and repeats at every mechanical revision of the lens.
"A wide view holds its value only if the numbers behind it survive contact with the housing, the lens holder and the dewarp stage."
— JSD optical engineering note, ultra-wide M12 designsNone of the three is a reason to avoid ultra-wide optics. Each is a reason to select a part whose published data answers all three at once, and to do that before the enclosure drawing leaves the mechanical team.
The numbers that decide an ultra-wide build
Four values drive the rest of a panoramic design, and engineering teams that write them down before comparing parts turn a shortlist into a decision. Left implicit, the same four return later as a change request.
Field-of-view axis and value — decide whether the requirement is diagonal, horizontal or vertical, then hold that axis across every candidate.
Mount and thread — M12 (S-mount) and M8 barrels are not interchangeable; the holder, the focusing method and the board keep-out all follow from the thread.
Total track length — the distance occupied by the optics in front of the sensor. It sets minimum housing depth, lens-holder height and the position of the board standoffs.
Distortion figure and the pipeline behind it — whether the value is corrected in software, and whether the profile is supplied with the part or measured by the integrator.
Two further checks belong in the same pass. The image circle has to cover the sensor diagonal with margin, and the sensor has to accept the chief ray angle the optics present at the corners; both are stated in the sensor documentation and both are worth reading before the holder drawing is released. A short focal length concentrates these constraints, which is why a 2.16 mm part is specified as a system rather than as a component.
Aperture then sets the light budget. Ultra-wide designs are frequently specified for dim indoor or covered outdoor scenes, where the front group has to deliver a large field without starving the sensor. A larger aperture widens the acceptance cone at every pixel and buys signal in low light, and it raises the importance of corner behaviour in the sensor's microlens array rather than lowering it.
JSD2112: what the design delivers
The JSD2112 is a 2.16 mm fixed-focal M12 lens specified for 5MP sensors across the 1/2.7" and 1/2.8" classes. Its published field-of-view data is given as two full triplets rather than a single headline figure, which is what makes the part practical to design with.
Measured field of view, stated as two triplets
Two configurations are documented for the same physical part. The wider one covers 181 degrees diagonal, 150 degrees horizontal and 84 degrees vertical; the narrower one covers 172 degrees diagonal, 144 degrees horizontal and 82 degrees vertical. The difference between them is configuration, not hardware. Publishing the pairs means a coverage calculation is done against the exact axis that matters, and a shift of opinion between 150 and 144 degrees horizontal reaches the lens holder as a setting rather than as a redesign.
JSD2112 coverage geometry at 8.3 mm image radius: one assembly serves both published field-of-view configurations, so a 1/2.7" sensor can work across its full diagonal while the wider triplet and the tighter triplet are a configuration decision rather than a second part number.
5MP resolution for a 1/2.7" or 1/2.8" sensor
The optics are designed around a 5MP pixel pitch. For a security or inspection camera that has to resolve faces, labels or parts inside one wide frame, that resolution is what separates a panoramic record from a usable one: edge detail survives, so the corners of the frame carry information rather than only context.
F1.2 aperture for low-light frames
F1.2 is fast for a wide-angle fixed lens. It holds exposure times short in dim lobbies, warehouses and covered forecourts, which reduces motion smear and lets the pipeline stay in a lower gain range. At close range the same aperture also produces shallow depth rendering, which entry and doorbell cameras use to separate a visitor from the background.
Distortion held below 3.2 percent, and stated as a measured value
Barrel distortion is measured below -3.17 percent. That is a controlled amount, not an absence: a lens this wide still bends straight lines near the frame edge, and the sign and magnitude tell the software team how much geometric correction to plan for. A measured figure can be checked against a test chart at the intended working distance, which a qualitative claim cannot.
Mechanical envelope: what each value fixes in the housing
| Design constraint | JSD2112 value | What it fixes in the housing |
|---|---|---|
| Total track length | 17.41 mm | Minimum depth from the sensor plane to the front of the optics |
| Mount / thread | M12 (S-mount) | Holder bore, focusing method and board keep-out |
| Focal length | 2.16 mm | Coverage geometry and the chief ray angle at the corners |
| Aperture | F1.2 | Front element size and the low-light exposure budget |
| Image circle class | 1/2.7" and 1/2.8" | Sensor selection and corner illumination margin |
| Field of view | 181 / 150 / 84 degrees (D/H/V) 172 / 144 / 82 degrees (D/H/V) | Coverage per camera position and the dewarp profile |
| Distortion | below -3.17 percent | How much geometric correction the pipeline must apply |
| Resolution | 5MP | Sensor pixel pitch the optics are tuned for |
JSD2112 2.16mm F1.2 5MP M12 ultra-wide lens product page: current specifications, drawings and ordering data.
Where this lens earns its place
Panoramic and single-camera coverage
Elevators, lobbies, warehouse aisles and stairwells are the case where one camera replaces several narrow ones, with no blind zone between the fields and no second cable run to maintain. A single JSD2112 covers that scene from one position, and the documented field-of-view pair lets an integrator pick the widest coverage or a slightly tighter frame with less edge content.
Smart entry and doorbell cameras
An entry camera has to hold a visitor, a doorstep and a delivery in one frame at very close range, often in poor light. A 2.16 mm focal length with an F1.2 aperture covers that geometry with enough signal to avoid aggressive noise reduction, which is what keeps a face recognisable rather than smoothed.
Automotive and mobile platforms
Dash and blind-spot cameras need wide coverage from a shallow module position. The short track relative to the field, together with the M12 interface, makes the part straightforward to mount and focus on a board camera, and the 5MP resolution keeps road markings and plates legible toward the frame edges where the geometry is stretched.
Embedded vision and inspection
Inspection cells that must observe a whole fixture rather than a single feature benefit from one wide, predictable view. The value there is repeatability: the same 17.41 mm track and the same measured distortion figure across production lots mean a calibration result transfers from one unit to the next.
Standard wide-angle vs. JSD2112
A general-purpose wide-angle datasheet generally gives enough to order a part and not enough to release a housing drawing. The comparison below is written around what each difference changes for the mechanical, optical and software workstreams.
| Consideration | Typical standard wide-angle lens | JSD2112 |
|---|---|---|
| Field of view | Usually one figure, axis often unstated | Two complete D/H/V triplets: 181/150/84 degrees and 172/144/82 degrees |
| Low light | F1.8 to F2.4 is common at this coverage | F1.2 aperture |
| Resolution | Commonly specified for 2MP sensors | 5MP |
| Mechanical fit | Track length varies by lot and by vendor | 17.41 mm track in a standard M12 (S-mount) barrel |
| Distortion handling | Qualitative description; the profile is characterised by the integrator | Measured below -3.17 percent, stated with the part |
| Integration effort | Coverage, holder and dewarp are verified during prototype builds | Coverage, holder and dewarp can be sized from the datasheet |
Two design choices account for most of the difference. A fast F1.2 aperture at this focal length needs a larger front group, which is why the track is 17.41 mm rather than shorter: the optics are sized for light gathering first. Publishing the field of view as two triplets rather than one headline number reflects how the part is configured and used.
Selection guidance
Confirm coverage first. Convert the scene to a required diagonal, horizontal or vertical angle at the intended mounting position, then compare against the matching axis of the JSD2112 triplet.
Check the track against the housing. 17.41 mm from the sensor plane sets the minimum internal depth before the holder and the front window.
Match the sensor class. Use a 5MP part in the 1/2.7" or 1/2.8" class so the lens resolution and the image circle are both exercised, and confirm the chief ray angle at the corners with the sensor documentation.
Plan the dewarp stage early. Budget for geometric correction of a measured barrel rather than assuming none is needed.
Freeze the optical path before tooling. With a fixed track and a standard thread, the holder geometry can be released before the enclosure is machined.
When to pick a different lens
A lens this wide answers a specific question. Three requirements call for a different part:
Narrow fields or long working distances. Where the requirement is a few metres of coverage from a distance, or a tight frame on a single feature, a longer focal length in the M12 series uses the sensor's pixels far more efficiently than any 2.16 mm design.
Measuring geometry in software. When the pipeline derives dimensions directly from pixels, a 150-degree horizontal field is the wrong starting point; a low-distortion M12 lens with a narrower angle spends fewer pixels on image area that then has to be corrected away.
Sealed outdoor enclosures. The JSD2112 is a standard optical assembly without an IP rating of its own. Where water or dust ingress is a design requirement, sealing is engineered at the module level with the appropriate gasket and window, and the optical stack is specified together with that enclosure.
In all three cases the answer is a different optical part, and the M12, M16 and M8 ranges are built around sensor requirements so that a requirement can be mapped to the right one instead of stretching a wide-angle design into a job it was not built for.
Working with JSD Optics on a wide-angle module
JSD Optics develops M12, M16 and M8 imaging lenses around image sensors rather than around a fixed list of focal lengths. For an ultra-wide project that order of work matters, because the sensor usually drives the decision: pixel pitch, chief ray angle, image circle and mechanical keep-out define what the lens has to be. The specification database is organised so a project can start from the sensor and work forward.
For a component that will be built into a camera module, three facts carry more weight than a brochure. JSD Optics implements ISO9001:2015 and IATF16949 quality management systems, and operates production and laboratory facilities for optical measurement. Lens assemblies are available for evaluation before a design is frozen, and engineering data such as detailed drawings and measurement results can be prepared for a design review on request.
Current specifications and ordering data: JSD2112 2.16mm F1.2 5MP M12 ultra-wide lens for 1/2.7" and 1/2.8" sensors.
❓ Frequently Asked Questions
The questions that come up most often when the JSD2112 is evaluated for a new camera module.
Which image sensors does the JSD2112 fit?
It is designed for 5MP sensors in the 1/2.7-inch and 1/2.8-inch classes. Confirm the image circle against your sensor diagonal and check the chief ray angle the sensor expects at the corners before releasing the holder drawing.
What is the field of view of the JSD2112?
Two configurations are documented: 181 degrees diagonal, 150 degrees horizontal and 84 degrees vertical; and 172 degrees diagonal, 144 degrees horizontal and 82 degrees vertical. Compare against the axis your coverage calculation uses.
Does an ultra-wide lens mean barrel distortion has to be accepted?
Some barrel distortion is inherent to a field this wide. The JSD2112 is measured below -3.17 percent, which is modest for the coverage. Plan for geometric correction in the pipeline and verify the residual against a test chart at the intended working distance.
How much housing depth does the JSD2112 need?
Plan for 17.41 mm of total track length in front of the sensor plane, in an M12 (S-mount) barrel. That figure covers the optics; add the holder, the front window and any sealing arrangement on top of it.
Can samples be requested before a design freeze?
Yes. Lens assemblies are available for evaluation, and engineering data such as detailed drawings and measurement results can be prepared for a design review. Share the sensor, the required coverage axis and the mechanical keep-out to get an evaluation set that matches the project.
Size the JSD2112 into your next camera module
Send the sensor, the coverage axis and the mechanical keep-out, and JSD optical engineers will confirm the fit and prepare an evaluation set.
Or email us at info@jsdoptical.com
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