Lens / Focal Length · Abu Dhabi
Correct lens and focal length selection determines whether a CCTV camera captures usable detection, recognition, or identification imagery at the required distance. Emirtech specifies fixed-focal, varifocal, and motorised-zoom lenses per scene across Abu Dhabi and Al Ain.
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Emirtech Technology is an ADMCC-approved electronic security integrator founded in 2018, operating from M44, Mussafah Industrial Area, Abu Dhabi, and contactable on +971 55 651 7843. Our lens and focal length selection service engineers the optical front end of every CCTV camera we deploy across Abu Dhabi Emirate, including Al Ain. We assess scene geometry, target distance, required pixel density (detection, recognition, or identification per the IEC 62676-4 pixels-per-metre tiers: about 25 detect, 62.5 observe, 125 recognise and 250 identify), ambient lighting, and mounting constraints before specifying a lens. We deploy three lens classes: fixed-focal (factory pre-set angle, most common, lowest cost — typical for corridors and small rooms), varifocal (manually adjustable zoom range, flexible for retrofit installations where exact framing is finalised on-site), and motorised zoom (remote-adjustable via VMS or NVR for evolving requirements and PTZ-style coverage). Focal length effects are deterministic: 2.8mm delivers a wide 110°+ horizontal field of view suitable for close-area lobbies and reception; 4mm gives roughly 90° general-purpose coverage; 6mm to 12mm narrows to 50°–30° for corridor face-capture and medium-range monitoring; 12mm to 50mm zoom ranges support distance ANPR at vehicle entry gates and long-range face identification. We calculate field of view (FOV) using sensor size and focal length per the standard optical formula and document the design in writing. UAE Federal Decree-Law No. 45 of 2021 (PDPL) implications are material — focal length defines who and what is identifiable, so we restrict identification-grade framing to lawful purposes and document the privacy basis. Emirtech is an Control4 installer; for camera hardware we install commercially via authorised UAE channels but are not an Authorised Distributor of Hikvision, Dahua, Axis, or Hanwha. Geographic scope is Abu Dhabi Emirate only for ADMCC-regulated electronic security work.
Lens types we deploy
Factory pre-set focal length — most common, lowest cost, no field adjustment. Typical for corridors, small rooms, lifts, and reception areas where the scene geometry is known and stable. 2.8mm or 4mm fixed lenses suit most indoor coverage tasks.
Manually adjustable zoom range (commonly 2.8–12mm). Flexible mounting for retrofit projects where exact framing is finalised on-site after cable termination. Allows fine-tuning of horizontal field of view without changing the camera body during commissioning.
Remote-adjustable focal length controlled through the VMS or NVR interface. Suitable for evolving scenes, distant ANPR lanes, and operational areas where tasking changes. Higher cost than fixed or varifocal but reduces site revisits when the target framing is refined.
Telephoto ranges of 12–50mm or higher for distance ANPR at vehicle gates and long-range face capture across yards and perimeter zones. We pair these lenses with appropriate sensor sizes and IR illumination to maintain pixel density at the target standoff distance.
Our Abu Dhabi engineering team produces a per-camera lens schedule for every project, calculating field of view, pixel density at the target distance, and lawful PDPL framing before procurement. Call +971 55 651 7843 or request a free lens selection consultation.
Engineering inputs
We design to the IEC 62676-4 detection, observation, recognition and identification thresholds. Pixel density at the target distance is the primary driver of focal length — not personal preference. The schedule records the target px/m for each camera and the lens that meets it.
FOV is calculated from sensor size and focal length using the standard optical formula. We document horizontal, vertical, and diagonal angles per camera so the installer mounts the unit to deliver the framing the design intends, not a guess on-site.
Federal Decree-Law No. 45 of 2021 (PDPL) requires that personal data processing — including identifiable CCTV imagery — has a lawful basis. We restrict identification-grade focal lengths to areas with a recorded purpose and signed-off retention policy.
Lens aperture (f-number) interacts with sensor sensitivity and IR illumination to determine usable low-light performance. We specify wider apertures for low-light scenes and balance them against depth-of-field requirements for the target distance.
Emirtech keeps the scope of lens and focal length camera selection clear and documented. We engineer optical specifications, calculate fields of view, and select the correct lens class per camera location, but we do not overstate brand status or regulatory remit.
Every lens decision is recorded in the design schedule so the client, the installer, and the maintenance team work from the same single source of truth across the project lifecycle.
Common questions
For close-area reception coverage at 3–6 metres, a 2.8mm fixed-focal lens delivering roughly 110° horizontal field of view is the common choice. It captures the whole reception zone at recognition-grade pixel density without leaving large blind areas, and it suits the standard ceiling mounting heights used in Abu Dhabi commercial fit-outs.
Varifocal lenses are preferred when the exact framing cannot be finalised before site survey — typical in retrofit projects, irregular ceiling layouts, or scenes where the target distance is uncertain. They allow the installer to dial in the field of view on-site during commissioning, which avoids returning to swap a fixed lens that ended up too wide or too narrow.
No. Emirtech is not an Authorised Distributor or Channel Partner of Hikvision, Dahua, Axis, or Hanwha. We install these camera brands commercially via authorised UAE channels. We hold no manufacturer credential of our own. We are ADMCC-approved for electronic security work in Abu Dhabi Emirate.
Focal length determines whether captured imagery is identifiable to a specific person. Under Federal Decree-Law No. 45 of 2021 (PDPL), processing identifiable personal data requires a lawful basis. We restrict identification-grade focal lengths to camera locations with a documented lawful purpose, signed-off retention policy, and appropriate signage as part of the design package.
ANPR requires roughly 150–250 pixels across the number plate. For typical UAE plates at a 5–15 metre standoff, this is usually achieved with a 6–12mm varifocal or a 12–50mm motorised zoom lens, depending on lane width and mounting distance. The exact focal length is calculated per gate during the design phase and documented in the schedule.
Call +971 55 651 7843, email [email protected], or visit our quotation page to book a free site survey. Our engineering team will visit the site in Abu Dhabi or Al Ain, calculate fields of view, and return a written lens schedule with per-camera focal length recommendations and pricing.
Lens / Focal Length · Abu Dhabi
Free site survey · transparent scope · honest costs · ADMCC-approved for security systems · Mussafah M44 home base since 2018.
Need a free Abu Dhabi site visit? Call +971 55 651 7843 or email [email protected] — we reply the same working day across Abu Dhabi and Al Ain.