ACTi A76 vs ACTi Z721: Specification Comparison
The ACTi A76 and ACTi Z721 are both 4MP fixed outdoor dome cameras targeting perimeter and general surveillance applications. This comparison evaluates how each model performs across imaging quality, physical installation requirements, and system integration — the three decision axes most relevant to installers and IT buyers selecting between two cameras of the same resolution class and form factor from the same manufacturer.
In This Guide
How do the imaging specs compare?
Both cameras use a 1/2.7" sensor at 4MP resolution, but their optical and low-light characteristics diverge. The A76 ships with a 2.8mm fixed lens at an unspecified aperture, delivers a maximum frame rate of 30 fps at 2688×1520, and achieves a minimum color illumination of 0.003 lux. The Z721 uses a 4mm fixed lens at f/2.8 aperture and reaches a slightly lower minimum color illumination of 0.002 lux at f/1.6, though that figure is measured at a wider aperture than the A76 spec, making direct lux comparison context-dependent. Maximum frame rate is not specified for the Z721.
WDR performance is a clear differentiator: the A76 is rated at 150 dB Extreme WDR versus 135 dB on the Z721 — a 15 dB advantage that will be meaningful in high-contrast scenes such as entry lobbies or parking structures with mixed sunlight and shadow. IR illumination also differs significantly: the A76 provides 850nm IR LED coverage out to 65m, while the Z721 uses Adaptive IR LED at 850nm with a 30m range — roughly half the reach, which limits the Z721 in longer corridors or open perimeter runs. Both cameras offer full-color and IR night modes with 0 lux capability in B/W with IR active.
What about installation and environment?
Both cameras carry IK10 vandal resistance, making them suitable for exposed public locations. Their ingress protection ratings diverge: the A76 is rated IP68 (continuous submersion beyond 1m per IEC 60529), while the Z721 is rated IP67 (temporary immersion up to 1m for 30 minutes). For most above-ground outdoor installations this distinction is minor, but it becomes relevant in flood-prone areas, underground vaults, or wash-down environments. The Z721 additionally holds an EN50155 railway certification and UL Listing — certifications not present on the A76 — making the Z721 more readily deployable in transit, rail, and regulated North American installations.
Power and operating temperature are equivalent: both accept DC 12V or PoE IEEE 802.3af, and both operate across -40°C to 60°C. Mounting options are nearly identical — wall, pole, and pendant — with the A76 adding a corner mount option not listed for the Z721. The A76 dimensions are specified at Ø110.82mm × 84.7mm; equivalent dimensions are not provided in the Z721 spec set. The Z721 body is described as metal construction; material specification is absent for the A76.
Which fits your VMS and analytics better?
Both cameras support ONVIF Profile S, G, T, and M. The Z721 spec additionally lists explicit validated VMS compatibility with Milestone, Genetec, and Axis Camera Station — a useful guarantee for enterprise deployments on those platforms; the A76 spec does not list named VMS partners beyond ONVIF profiles. Video compression support is equivalent: H.265, H.264, and MJPEG on both models.
Edge analytics differ in labeling but are broadly similar: both support Deep Learning-based analytics and VMD. The A76 specifies Face Detection and People Detection as named functions; the Z721 spec lists DLPU (Deep Learning Processing Unit) plus Intrusion protection as a named analytic, but does not enumerate Face or People Detection by name. Audio capabilities diverge: the A76 provides external line-in and line-out connections supporting two-way audio via external microphone/speaker; the Z721 includes a built-in microphone plus line-in and line-out, giving it an integrated audio option without additional cabling. On-board edge storage is not specified for either model.
Which should you choose: the A76 or the Z721?
Our take: The A76 is the stronger choice when maximum WDR dynamic range, longer IR reach, or deeper water ingress protection are the primary requirements; the Z721 is the better fit when rail/transit certifications, a shorter-range compact form factor, built-in microphone, or named Milestone/Genetec VMS validation are needed. Spec deltas that drive the decision: the A76's 150 dB WDR outperforms the Z721's 135 dB by 15 dB; the A76's IR range of 65m is double the Z721's 30m; and the A76 carries IP68 versus the Z721's IP67. Conversely, the Z721 holds EN50155 and UL Listing certifications absent on the A76, lists explicit VMS partner validation, and integrates a built-in microphone. Choose the A76 for open-perimeter or high-contrast fixed surveillance; choose the Z721 for transit environments or sites standardized on Milestone or Genetec.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | ACTi A76 | ACTi Z721 |
|---|---|---|
| Resolution | 4MP | 4MP |
| Image Sensor | 1/2.7" | 1/2.7" |
| Lens / Focal Length | 2.8mm fixed, board mount | 4mm fixed, f/2.8 |
| Min Illumination (Color) | 0.003 lux | 0.002 lux @ f/1.6 |
| Min Illumination (B/W) | 0 lux (IR on) | 0 lux (IR on) |
| IR Range | 65m | 30m |
| IR Wavelength | 850nm | 850nm (Adaptive IR LED) |
| WDR | 150 dB Extreme WDR | 135 dB Extreme WDR |
| Max Frame Rate | 30 fps @ 2688×1520 | Not specified |
| Video Compression | H.265; H.264; MJPEG | H.265; H.264; MJPEG |
| IP Rating | IP68 | IP67 |
| IK / Impact Rating | IK10 | IK10 |
| Operating Temperature | -40°C to 60°C | -40°C to 60°C |
| Power Input / PoE Class | DC 12V; PoE Class 3 (802.3af) | DC 12V ±25%; PoE (802.3af) |
| Audio | Line-in; Line-out (external) | Built-in mic; Line-in; Line-out |
| Edge Analytics | Deep Learning: Face Detection, People Detection; VMD | Deep Learning (DLPU); VMD; Intrusion protection |
| ONVIF Profiles | Profile S, G, T, M | Profile S, G, T, M |
| Named VMS Compatibility | — | Milestone; Genetec; Axis Camera Station |
| Certifications | CE Class B; FCC Class B; IP68; IK10; Taiwan IoT Cybersecurity (TAICS, CNS-16120) | CE Class A; FCC Class A; IP67; IK10; EN50155; UL Listed; BSMI |
| Mount Types | Wall; Pole; Pendant; Corner | Wall; Pole; Pendant |
| Dimensions | Ø110.82mm × 84.7mm | Not specified |
| Warranty | 3 Years | Not specified |
Frequently Asked Questions
Which should you choose: the A76 or the Z721?
The A76 is the stronger choice when maximum WDR dynamic range, longer IR reach, or deeper water ingress protection are the primary requirements; the Z721 is the better fit when rail/transit certifications, a shorter-range compact form factor, built-in microphone, or named Milestone/Genetec VMS validation are needed. Spec deltas that drive the decision: the A76's 150 dB WDR outperforms the Z721's 135 dB by 15 dB; the A76's IR range of 65m is double the Z721's 30m; and the A76 carries IP68 versus the Z721's IP67. Conversely, the Z721 holds EN50155 and UL Listing certifications absent on the A76, lists explicit VMS partner validation, and integrates a built-in microphone. Choose the A76 for open-perimeter or high-contrast fixed surveillance; choose the Z721 for transit environments or sites standardized on Milestone or Genetec.
Is the A76 or Z721 better for low-light performance?
Based on specified IR range, the A76 covers significantly more ground at 65m versus the Z721's 30m. Minimum lux figures are close — 0.003 lux (A76) versus 0.002 lux (Z721 at f/1.6) — but the aperture conditions differ between datasheets, so direct comparison is not straightforward. For long-range night coverage the A76 is the stronger spec; for compact short-range installs the Z721's adaptive IR and slightly lower lux figure may be adequate.
Which camera is better suited for a Milestone or Genetec VMS deployment?
The Z721 spec explicitly lists validated compatibility with Milestone and Genetec in addition to ONVIF Profile S/G/T/M. The A76 spec does not list named VMS partners beyond ONVIF profiles. Both cameras should function on any ONVIF-compliant platform, but if your procurement process requires documented vendor validation from the camera manufacturer, the Z721 provides that assurance and the A76 does not per the available specifications.
Does either camera have a transit or railway certification?
Yes — the Z721 holds EN50155 railway certification and a UL Listing, certifications that are not listed in the A76 spec. If the installation site is a rail vehicle, transit station governed by EN50155 compliance requirements, or a North American project requiring UL Listed equipment, the Z721 meets those requirements and the A76 does not based on the provided specifications.
Get a Second Opinion on Your Camera Choice
Share your site layout, coverage goals, and budget. Our team will validate the camera selection, flag anything we would change, and recommend products that match the use case.