DS-2CD2686G2-IZSU/SL, DS-2TD2628-3/QA, and DS-2CD2043G2-I(U) are not direct substitutes. The first is an 8 MP varifocal network camera with active warning functions, the second combines thermal and optical sensing for heat-related and perimeter workflows, and the third is a compact 4 MP fixed-lens network camera. Choose by detection objective and response workflow before comparing resolution.
Model comparison
| Specification | DS-2CD2686G2-IZSU/SL | DS-2TD2628-3/QA | DS-2CD2043G2-I(U) |
|---|---|---|---|
| Camera type | Visible-light network bullet | Thermal-optical bi-spectrum bullet | Compact visible-light network bullet |
| Image output | Up to 8 MP, 3840 × 2160 | Thermal 256 × 192; optical up to 2688 × 1520 | Up to 4 MP, 2688 × 1520 |
| Lens | 2.8–12 mm motorized varifocal | Fixed thermal and optical channels | 2.8, 4, or 6 mm fixed options |
| Primary analytics | Human and vehicle classification for supported events | Thermal target detection, human/vehicle classification, and temperature-exception alarms | Human and vehicle classification for supported events |
| On-camera response | Strobe light, audible warning, and two-way audio support | Thermal/optical event output; response depends on configured system | Built-in microphone on the U version; no comparable strobe deterrence function |
| Environmental protection | IP66 and IK10 | IP67 and IK10 | IP67 |
| Best-fit objective | Detailed identification plus visible/audible intervention | Perimeter detection and heat-related exception monitoring | Cost-controlled 4 MP coverage in a compact form |
Confirm the exact regional suffix and current data sheet. Similar names can represent different lenses, housings, audio options, firmware branches, or thermal ranges. Do not substitute an adjacent suffix based only on a search result.
DS-2CD2686G2-IZSU/SL: detailed imaging with active warning
DS-2CD2686G2-IZSU/SL combines an 8 MP image, a 2.8–12 mm motorized varifocal lens, 120 dB WDR, H.265+ compression, and human/vehicle classification for supported events. The lens can be adjusted to match the target area after installation, making it suitable for entrances, perimeter lanes, vehicle approaches, and other scenes where target size matters.
The strobe light, audible warning, alarm interfaces, and two-way audio support allow a configured system to move beyond passive recording. These functions need an event and response design: define when the warning activates, how long it runs, who receives the alarm, how operators verify it, and how nuisance activation is controlled.
View DS-2CD2686G2-IZSU/SL product details.
DS-2TD2628-3/QA: thermal and optical sensing
DS-2TD2628-3/QA combines a 256 × 192 thermal channel with an optical channel up to 2688 × 1520. Thermal sensing responds to heat contrast rather than visible color, so it can support target detection in darkness and other visually difficult conditions. The optical channel provides familiar scene detail for verification.
The model supports human and vehicle classification and temperature-exception alarms. Its specified thermography range is −20 °C to 150 °C with ±8 °C accuracy under defined conditions. That specification must be evaluated against target size, distance, emissivity, weather, viewing angle, reflected heat, and the required alarm threshold. Treat the camera as one component in the site’s safety and response design, not as a substitute for separately required fire or process-safety systems.
Review the current DS-2TD2628-3/QA technical data sheet for measurement conditions and interfaces.
View DS-2TD2628-3/QA product details.
DS-2CD2043G2-I(U): compact 4 MP coverage
DS-2CD2043G2-I(U) is a compact 4 MP fixed bullet camera with 120 dB WDR, H.265+ compression, human/vehicle classification, and IR illumination specified up to 40 m. It is a practical option for repeatable views where a fixed lens can be selected during design and active warning or thermal measurement is not required.
The U suffix identifies the built-in microphone version. Audio must be evaluated against local policy, notice requirements, network bandwidth, recorder support, and the intended use. Fixed 2.8, 4, and 6 mm lens options are not interchangeable after ordering, so calculate the required horizontal coverage and pixel density first.
View DS-2CD2043G2-I(U) product details.
Choose by operational objective
Use DS-2CD2686G2-IZSU/SL when the site needs intervention
This model fits scenes that need adjustable high-detail imaging and a local warning response. Confirm privacy and nuisance-alarm controls before enabling light or sound.
Use DS-2TD2628-3/QA when visible light is not enough
Select the thermal-optical model when the project needs heat contrast, temperature-exception alarms, or detection in visual darkness. Validate target size and thermal conditions at the real distance.
Use DS-2CD2043G2-I(U) for repeatable fixed views
This is the simpler choice for general 4 MP coverage, especially when the scene does not require varifocal adjustment, active deterrence, or thermal sensing.
System-design checklist
- Define detection, observation, recognition, identification, or temperature-exception goals.
- Calculate target distance, field of view, mounting height, and pixel density.
- Confirm PoE class, switch budget, surge protection, and network path.
- Verify NVR or VMS resolution, codec, analytics, audio, alarm I/O, and bandwidth support.
- Calculate storage from frame rate, bitrate, event schedule, audio, and retention period.
- Match firmware, region, hardware suffix, and management-platform versions.
- Test low light, motion, backlight, weather, thermal contrast, and alarm workflow on site.
Compare additional thermal formats
Use the thermal and bi-spectrum camera collection to compare additional sensor, lens and application combinations. Temperature measurement, detection distance and alarm behavior remain model-specific and require validation against the current technical documentation.
Frequently asked questions
Which model has the highest visible-light resolution?
DS-2CD2686G2-IZSU/SL, at up to 8 MP. Higher resolution does not replace correct lens choice, target sizing, lighting, or motion settings.
Which model can monitor temperature exceptions?
DS-2TD2628-3/QA. Confirm the required temperature range, accuracy, distance, target size, emissivity, environment, and alarm workflow against the current technical documentation.
Do all three models provide audio?
No. DS-2CD2686G2-IZSU/SL supports two-way audio functions, DS-2CD2043G2-I(U) has a built-in microphone only on the U version, and DS-2TD2628-3/QA has its own interface set. Confirm the exact suffix and recorder support.
Can a thermal camera replace an optical identification camera?
Not in every workflow. Thermal imaging is strong for heat contrast and detection, while optical imaging provides color and familiar visual detail. The bi-spectrum model combines both channels, but target identification requirements still need a site-specific test.