Dahua
HAC-B1A21P
Bullet Camera · 2.1MP (1920×1080)
- • 86° HFOV at 3.6mm
- • 20 m effective range
- • 20 m IR illumination
Side-by-side comparison · within brand
Dahua HAC-B1A21P vs Dahua HAC-B2A21P
Spec-by-spec comparison of two bullet camera models, with EN 62676-4 lens math and design recommendations.
Dahua
HAC-B2A21P
Bullet Camera · 2.1MP (1920×1080)
- • 106° HFOV at 2.8mm
- • 20 m effective range
- • 20 m IR illumination
Specification side-by-side
| Dahua HAC-B1A21P | Dahua HAC-B2A21P | |
|---|---|---|
| Manufacturer | Dahua | Dahua |
| Form factor | Bullet Camera | Bullet Camera |
| Resolution | 2.1MP (1920×1080) | 2.1MP (1920×1080) |
| Focal length | 3.6mm | 2.8mm |
| Horizontal FOV | 86° | 106° |
| Effective range | 20 m | 20 m |
| IR distance | 20 m | 20 m |
| Low-light / ColorVu | Standard | Standard |
Verdict
Both cameras offer comparable specs on paper. The choice typically comes down to vendor lock-in, NDAA compliance and existing VMS integrations rather than raw imaging numbers.
Frequently asked questions
Is Dahua HAC-B1A21P better than Dahua HAC-B2A21P?
Both cameras offer comparable specs on paper. The choice typically comes down to vendor lock-in, NDAA compliance and existing VMS integrations rather than raw imaging numbers. For installation-specific advice — mounting height, tilt, obstacle shadowing, BOM and PoE budget — drop both cameras into TodAidesign and the FOV cones, DORI rings (per EN 62676-4) and cable schedule render in real time on a satellite map or imported floor plan.
What is the field of view of Dahua HAC-B1A21P vs Dahua HAC-B2A21P?
Dahua HAC-B1A21P has a 86° horizontal FOV at 3.6mm. Dahua HAC-B2A21P has a 106° horizontal FOV at 2.8mm. Dahua covers a wider scene at the same distance; the FOV calculator on TodAidesign converts these into linear meters of coverage at any chosen target distance.
Which camera has stronger IR illumination?
Dahua HAC-B2A21P reaches 20 m of IR illumination versus 20 m for Dahua HAC-B1A21P. The further-reaching IR camera is the better fit for unlit yards, parking perimeters and warehouses without permanent lighting.
Can I plan a project mixing Dahua and Dahua cameras?
Yes. TodAidesign is multi-vendor by design — drop Dahua and Dahua cameras on the same canvas, share the same EN 62676-4 lens math and DORI ring overlays, and consolidate them into one BOM with cable schedule and PoE budget. Vendor design tools (Axis Site Designer, Hikvision HiTools, Dahua Project Design Tool, i-PRO SDT) cannot do this because each speaks only its own catalog.
Continue reading
FOV Calculator →
Convert 86° vs 106° HFOV into linear coverage at any distance.
DORI Calculator →
Compute Detect / Observe / Recognize / Identify ranges per EN 62676-4.
Bandwidth Calculator →
Estimate Mbps per camera for codec, FPS, scene complexity.
Browse all cameras →
Verified in-stock camera specifications.
Test both cameras in your project
Drop Dahua HAC-B1A21P and Dahua HAC-B2A21P on a real satellite map or imported floor plan. See live FOV cones, DORI rings, BOM and cable schedule in seconds.