These three 4 MP dome cameras differ mainly in lens flexibility and night imaging. DS-2CD2746G2-IZS uses a 2.8–12 mm motorized lens with IR. DS-2CD2547G2-LS uses ColorVu imaging and white light for fixed full-color views. DS-2CD2146G2-I(SU) is a fixed-lens IR dome with suffix-dependent audio and alarm functions. Select by scene geometry, lighting, and interface needs.
Model comparison
| Specification | DS-2CD2746G2-IZS | DS-2CD2547G2-LS | DS-2CD2146G2-I(SU) |
|---|---|---|---|
| Maximum resolution | 2688 × 1520 | 2688 × 1520 | 2688 × 1520 |
| Lens | 2.8–12 mm motorized varifocal | 2.8 or 4 mm fixed | 2.8, 4, or 6 mm fixed |
| Horizontal field of view | Approximately 108°–30° | 112° at 2.8 mm; 95° at 4 mm | 103° at 2.8 mm; 83° at 4 mm; 53° at 6 mm |
| Night imaging | IR, up to 40 m | ColorVu with white light, up to 30 m | IR, up to 30 m |
| WDR | 120 dB | 130 dB | 120 dB |
| Target classification | Human and vehicle classification for supported events | Human and vehicle classification for supported events | Human and vehicle classification for supported events |
| Audio and alarm | Audio and alarm interfaces | Built-in microphone; LS includes audio and alarm interfaces | U adds microphone; S adds audio and alarm interfaces |
| Protection | IP66, IK10 | IP67, IK08 | IP67, IK10 |
| Best-fit task | Adjustable target framing | Fixed full-color low-light evidence | General fixed IR dome coverage |
All three provide 4 MP output, but their lenses, illumination, interfaces, and enclosure ratings create different deployment outcomes. Confirm the precise I, S, U, and hardware-revision suffix before ordering.
DS-2CD2746G2-IZS: motorized varifocal flexibility
DS-2CD2746G2-IZS is the only motorized varifocal camera in this comparison. Its 2.8–12 mm range changes horizontal coverage from approximately 108° to 30°, allowing the installer to frame a wide entrance or narrow the view toward a specific target zone after mounting.
The camera provides 120 dB WDR, IR specified up to 40 m, H.265+, human/vehicle classification for supported events, audio and alarm interfaces, IP66 ingress protection, and IK10 impact protection. These features make it suitable for entrances, corridors, vehicle approaches, and other scenes where the final target width may need adjustment.
Motorized zoom does not create PTZ coverage. The viewing direction remains fixed. Calculate pixel density at both the wide and telephoto settings and confirm focus at day and night.
Review the official DS-2CD2746G2-IZS data sheet for stream, interface, storage, and environmental details.
View DS-2CD2746G2-IZS product details.
DS-2CD2547G2-LS: ColorVu with fixed lens
DS-2CD2547G2-LS uses an F1.0 lens and ColorVu imaging to preserve color in very low ambient light. When the scene does not provide enough light, its white supplemental light is specified up to 30 m. It offers 130 dB WDR and fixed 2.8 or 4 mm lens options.
The camera includes a built-in microphone. The LS configuration also provides audio and alarm interfaces. Its enclosure is IP67 and IK08. This combination suits entrances, retail approaches, parking areas, and other fixed scenes where clothing, vehicle, or object color is operationally important.
White light should be designed, not merely enabled. Test glare, reflective surfaces, insects, rain, neighboring properties, and the required evidence at the target distance. A 30 m illumination specification does not guarantee identification at 30 m.
View DS-2CD2547G2-LS product details.
DS-2CD2146G2-I(SU): fixed IR dome
DS-2CD2146G2-I(SU) is the conventional fixed-lens IR option. It offers 2.8, 4, or 6 mm lens choices, IR specified up to 30 m, 120 dB WDR, human/vehicle classification for supported events, IP67 ingress protection, and IK10 impact protection.
Suffixes matter. The U option adds a built-in microphone. The S option adds line-level audio and alarm interfaces. A combined SU configuration provides both sets of functions. Confirm the exact regional ordering code and product page rather than assuming every I version has audio.
View DS-2CD2146G2-I(SU) product details.
How to choose among the three
- Choose DS-2CD2746G2-IZS when the target width may need motorized adjustment or a narrower 12 mm view.
- Choose DS-2CD2547G2-LS when fixed full-color low-light evidence is required and white light is acceptable.
- Choose DS-2CD2146G2-I(SU) for general fixed IR coverage with precise suffix selection for microphone or alarm interfaces.
Project checklist
- Define target width, distance, and required pixels at the evidence point.
- Decide whether the scene should use IR or visible white light.
- Choose the fixed lens before ordering, or justify motorized varifocal adjustment.
- Confirm audio recording policy, alarm I/O, microphone, and speaker workflow.
- Check IP/IK requirements, mounting surface, junction box, and service access.
- Verify NVR analytics, codec, resolution, bandwidth, PoE, storage, and firmware.
- Test night footage, backlight, movement, reflections, and event search on site.
Frequently asked questions
Which model has a motorized lens?
DS-2CD2746G2-IZS. Its 2.8–12 mm lens provides approximately 108° to 30° horizontal coverage.
Which model provides full-color low-light imaging?
DS-2CD2547G2-LS. It uses ColorVu imaging and white supplemental light rather than conventional IR-only night imaging.
Which model has the strongest impact rating?
DS-2CD2746G2-IZS and DS-2CD2146G2-I(SU) are listed as IK10. DS-2CD2547G2-LS is listed as IK08.
Do all three have microphones?
No. DS-2CD2547G2-LS includes one. DS-2CD2146G2 requires the U suffix for a built-in microphone. DS-2CD2746G2-IZS provides audio interfaces rather than the same built-in-microphone claim.