Buying Guide · Surveillance
Commercial security camera buying guide.
A spec-first walkthrough for choosing commercial surveillance cameras — sensor and lens decisions, form-factor selection, NDAA brand landscape, NVR pairing, and the power and network sizing that determines whether the deployment actually performs in year three.
01 / Sensor & Lens
Pick the lens first. Pick the sensor second.
Most camera selection mistakes happen at the lens. A 4MP camera with the wrong field of view captures useless wide-angle wallpaper. A 2MP camera with the right focal length reads a license plate at 40 feet. The lens decides what the sensor sees.
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2.8 mm ~106° Wide overview, lobby, retail floor
4.0 mm ~78° General-purpose interior
6.0 mm ~52° Long corridor, parking entry
8.0 mm ~40° Identification at 25–40 ft
12.0 mm ~28° License plates at 30–50 ft
Varifocal 3-9 ~30–95° Field-adjustable on commissioning
Varifocal 4-13 ~22–82° Mid-range outdoor identification
For new installs where the final mounting position is not finalized, default to varifocal — it absorbs commissioning surprises. For known fixed positions (interior dome over a counter, fixed corridor bullet), a fixed lens is cheaper and sharper. The Hanwha XNV-6081Z varifocal dome is a typical outdoor default; the Hanwha XND-6080R indoor dome is the fixed-lens interior counterpart.
Sensor size matters more than megapixel count. A 1/1.8″ sensor at 4MP outperforms a 1/3″ sensor at 8MP under any low-light condition because pixel area scales by sensor surface, not resolution. For night-capable identification, pick by sensor first.
02 / Form Factors
Dome, bullet, turret, PTZ, multi-sensor.
Form factor is a mounting and durability decision before it’s an aesthetic one. The five categories that show up on commercial spec sheets:
- Dome — discreet, vandal-rated variants (IK10) for public spaces. Best for ceiling mount where aim direction is intentionally not obvious. Indoor and outdoor versions; outdoor needs IP66/IP67. Example: XNV-6081Z (outdoor vandal), XND-6080R (indoor IR).
- Bullet — directional, obvious deterrent, longer-throw IR. Best for perimeter, loading docks, parking. Example: XNO-6080R for short-range, XNO-9082R for long-range identification.
- Turret — eyeball-style; better than dome under harsh ambient light because the lens is forward-facing without a dome cover that fogs or smudges. Examples: XNV-9082R (4K AI), XNV-C8083R (8MP low-light).
- PTZ — operator-controlled pan-tilt-zoom; required when one camera must cover what would otherwise need four. Example: Hanwha XNP-6321 with 32x optical zoom for interior commercial; Axis Q6135-LE for long-range outdoor (lot, gate, perimeter).
- Multi-sensor — 3–4 imagers in a single housing; covers 180°–360° from one mount point. Replaces 3–4 separate cameras at corners or intersections. Example: Hanwha PNM-9322VQP.
Mix on purpose, not by default. The common pattern: perimeter bullets + interior turrets/domes + one PTZ for lots/yards + a multi-sensor at high-traffic intersections.
03 / Resolution & Bitrate
4K everywhere is a storage decision, not a quality decision.
Resolution should be picked by required pixel density at the target — not by what’s listed on the box. The pixels-per-foot (PPF) standards used by integrators:
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Observe activity 20–30 PPF Did something happen here?
Detect a person 40–60 PPF Someone is in the frame
Recognize a known face 80–100 PPF “That’s an employee”
Identify an unknown 140+ PPF Court-grade ID
License plate (LPR) 250+ PPF Plate read at full zoom
A 4MP camera with a 4 mm lens covering a 30 ft wide scene gives ~70 PPF — enough to detect, not to identify. Doubling resolution to 8MP gives ~100 PPF — recognition. Narrowing FOV with an 8 mm lens at 4MP gives ~140 PPF without doubling storage cost.
Bitrate scales roughly with the square of resolution. Going 2MP → 4K (8MP) without re-evaluating retention turns a 16-camera NVR into a 4-camera one. For storage and retention sizing, walk through the commercial camera storage planning guide before pulling the trigger on 4K-everywhere.
04 / Low Light & IR
IR distance is a spec, not a guess.
The IR distance number on a camera datasheet (e.g. “IR up to 50 m”) is the manufacturer’s measured range to detect a person in total darkness against a reflective background. Real installs underperform that by 30–50% because of dark clothing, off-axis scenes, and ambient glare. Practical guidance:
- Short-range IR (10–30 m) — interior corridors, small parking areas. Built into most 2–4MP cameras. Example: XNV-6081Z (~20 m).
- Mid-range IR (30–50 m) — small parking lots, loading docks. Look for “extended IR” or “adaptive IR” labeling.
- Long-range IR (50–150 m+) — large lots, perimeter, fence lines. Example: XNO-9082R (~100 m+) is purpose-built for this band.
- Color@Night (white light or low-lux color) — for scenes where color matters (vehicle color, clothing color in retail loss prevention). Cameras like the XNV-C8083R low-light turret hold color down to fractions of a lux without resorting to white-light supplemental.
- Thermal — separate category, beyond visible-light specs. Used for perimeter detection at extreme range. Not covered in this guide.
Avoid mixing white-light supplemental with neighboring IR cameras unless coordinated — the white light blooms the IR sensor of any camera that catches it, washing out the image.
05 / NDAA & Brand Landscape
The brands that survive Section 889.
Most commercial camera deployments — and effectively all federal, healthcare, education, and critical-infrastructure deployments — have to clear NDAA Section 889. That eliminates Hikvision, Dahua, Hytera, Huawei, ZTE, and any OEM that rebadges their imagers. The brands that survive screening and ship at commercial scale:
- Hanwha Vision (Wisenet) — broadest NDAA-compliant catalog for general commercial. The X-series (XND/XNV/XNO/XNP/PNM) is the workhorse line; 2MP through 4K, AI variants for analytics.
- Axis Communications — Swedish-origin, NDAA-compliant. Strongest at PTZ and specialty (long-range, harsh-environment). Example: Axis Q6135-LE.
- i-PRO — formerly Panasonic security division, NDAA-compliant. Strong at AI analytics and 4K. Example: i-PRO WV-X86531-Z2.
- Bosch — NDAA-compliant; strongest at intrusion-integrated and specialty (intelligent video analytics, ATM). Less common as a primary spec, more common as a complement.
- Avoid mid-tier rebadges — many “value” brands silently OEM from blocked manufacturers. If the rebadge story is not documented, treat as Section 889 risk.
For federal, government, and critical-infrastructure projects, run every model through the NDAA Section 889 compliance checklist before issuing a purchase order — manufacturer marketing is not a substitute for documented OEM origin.
06 / Recording Architecture
NVR, VMS, or cloud — pick by retention and operator count.
The recording head-end is a separate decision from the camera spec. Three patterns:
- Embedded NVR (single appliance) — best for single-site 8 to 32 cameras with limited operator workflow. Pre-wired, pre-licensed, lowest commissioning time. Examples: Hanwha XRN-810S (8-channel 4K) for small commercial; Hanwha XRN-3210B2 (32-channel 4K) for mid-sized.
- VMS server (Genetec, Milestone, Wisenet WAVE) — multi-site, large camera count (50+), or operator-heavy workflows (security ops center, multi-user live monitoring). Higher commissioning cost but scales horizontally.
- Cloud or hybrid (Eagle Eye, Avigilon Alta, Verkada) — best where IT prohibits on-prem storage or where remote-only access is required. Trades local control and bandwidth cost for zero-touch maintenance. Subscription pricing affects 5-year TCO significantly.
For real-world examples of how camera and NVR pairing plays out at scale, see the 32-camera NDAA surveillance deployment and the multi-building fiber surveillance backbone architectures.
07 / Network & Power
A 4K camera is a 12 W appliance with a switch on the other end.
Camera deployments fail more often at the PoE budget and surge protection than at the camera itself. Before signing off on a camera order, confirm:
- PoE class — most 2MP cameras are PoE (Class 3, ~13 W). 4K cameras with IR or heaters are often PoE+ (Class 4, ~25 W) or PoE++ (Class 6+, ~51 W). Multi-sensor and PTZ frequently need PoE++.
- Switch budget — the switch’s total PoE budget must exceed the sum of camera draw with overhead. Walk through the PoE switch sizing guide before specifying the switch.
- Cable distance — standard PoE is rated to 100 m. Beyond that, use a PoE extender (e.g. Tripp Lite N785-IPOE-2) or fiber media converter.
- Surge protection — every outdoor camera needs network surge on the run back to the switch. The APC PNET1GB is a low-cost insurance policy per drop.
- Battery backup — record-on-power-loss is only useful if the NVR and switch stay alive. Size the power supply and UPS to span the typical local outage window plus 30 minutes.
- Outdoor power cabinets — for cameras beyond the building envelope, an outdoor PoE cabinet (e.g. Altronix NetWaySP1B) sources power local to the camera rather than dragging fragile PoE runs across the property.
08 / Spec Sheet Checklist
Before signing the purchase order.
A camera order that survives commissioning has the following lines on the spec sheet:
- Resolution AND target PPF at the scene distance — not just megapixels in isolation.
- Focal length (fixed) or zoom range (varifocal) — and the calculated horizontal FOV at the mount distance.
- Sensor size — 1/2.8″ or larger for any low-light scene.
- IR distance — and a note on whether it matches the actual scene distance.
- IP / IK rating — IP66/IP67 for outdoor; IK10 for any vandal-exposed mounting.
- PoE class — and confirmation that the switch budget covers the total deployment.
- NDAA Section 889 compliance — for any federal, healthcare, education, or critical-infrastructure project.
- NVR/VMS compatibility — ONVIF Profile S/T is the baseline; manufacturer-native integration unlocks AI features.
- Retention target — and confirmed NVR storage capacity in TB at the camera bitrate and frame rate.
- Surge protection budget — one network surge per outdoor drop, sized into the BOM.
Pages and platforms are easy to compare on paper. The line between a deployment that performs in year three and one that gets ripped out is whether the spec sheet survives review by someone who has commissioned 50 sites — which is what the SHS technical desk does before any camera order ships.
Camera Spec Review
Pricing a camera deployment?
Send the camera count, scene distances, retention target, NVR/VMS, and any NDAA constraint. We come back with a model-by-model spec, PoE budget, storage sizing, and a BOM that lines up with the deployment — before the order ships.