Motorised zoom or fixed lens: the choice that decides whether your footage is useful
By Namra Shah · Cabling For U · Auckland · Updated September 2026
Of all the specifications on a camera, the lens has the biggest effect on whether footage is usable — and it is the one almost nobody asks about. A fixed lens is set at the factory. A motorised zoom lens can be adjusted on site and afterwards from the app. That difference is worth more than a step up in resolution.
Short answer: fixed lenses are fine where the distance is short and will never change — a front door, a hallway. Motorised zoom is worth it anywhere the right field of view is not obvious on install day, or where the scene might change. On most jobs we mix the two.
What the lens actually decides
The lens sets the field of view, and the field of view sets how many pixels land on a person. A wide lens covers more ground with fewer pixels on any one thing. A narrow lens covers less with far more detail.
This is why a modest camera on the right lens beats a 4K camera on the wrong one. The sensor can only work with what the lens delivers. Get the lens wrong and no amount of resolution rescues it — a point we make at more length in our piece on how much resolution you actually need.
Fixed lens: simple, and right more often than you would think
A fixed lens is factory-set, commonly around 4mm on the cameras we fit, giving roughly 93 degrees of view. Nothing to adjust, nothing to drift, fewer moving parts, and it is exactly right for the most common job in residential CCTV: watching a door from a few metres away.
At the front door, the back door, a hallway or a garage, the distance is known, short and permanent. A fixed lens is the correct answer and the money is better spent elsewhere.
The limitation is that you are committed. If the camera turns out to be watching too much or too little, the only fixes are physically moving the camera or replacing it.
Not sure which of these applies to your place? That is what our CCTV installation Auckland service is for. We walk the property, plan the camera positions with you, and email a fixed price within 24 hours — no charge, no obligation. Book a free site walk.
Motorised zoom: the flexibility that pays for itself
A motorised lens — commonly around 2.7 to 13.5mm on our range — can be adjusted remotely. It buys you three things.
You can tune on install day. No more guessing from a plan. We mount the camera, look at the live view, and dial the view to exactly what the position needs. That alone eliminates most “the camera doesn’t quite see what I wanted” conversations.
You can change it later. The neighbour builds a fence. You put in a hedge. The gate moves. The driveway extends. With a motorised lens that is a two-minute adjustment in the app rather than a call-out and a ladder.
You can push detail further. Zoomed in, the same sensor puts far more pixels on a face at the gate. That is how you get identification-grade footage at a distance without buying a specialist camera.
Where motorised zoom genuinely pays
- Driveways and gates. The distance is often longer than people estimate, and it is where you most want a face and a plate.
- Street frontages. Where you need to balance covering the property against filming the footpath.
- Commercial yards and car parks. Scenes change as the business changes.
- Anywhere access is difficult. A second-storey soffit or a high gable. Adjusting from the app beats getting the ladder out.
- Properties mid-change. New builds, landscaping underway, planned extensions.
Where a fixed lens is the better buy
Doors and short-range positions. The view is obvious and permanent.
Indoors in small rooms. You want wide, you want it now, and it is not changing.
Where you would rather spend elsewhere. A fixed-lens camera plus a cable run to a position you currently have no camera in is usually better value than a motorised lens on a spot already covered.
The privacy angle on wide lenses
An over-wide lens on a street frontage captures far more of the footpath and the neighbour’s property than you need, and that is a genuine consideration under the Privacy Act rather than just a courtesy. A motorised lens lets us pull the view back onto your own boundary rather than leaving it filming the street because that is what the factory set. Our guide to CCTV and privacy law in New Zealand covers where the obligations sit.
What “motorised” does not mean
It is not a PTZ. The camera does not pan or tilt — it stays pointing exactly where you mounted it. Only the zoom and focus move. If you need the camera to look in different directions, that is a PTZ, and a different conversation.
It also is not something you adjust daily. Set it once, correctly, and leave it. The value is in being able to change it when something genuinely changes, not in fiddling.
Three questions worth asking your installer
- What field of view will this position have, and how was that decided? “Whatever the camera comes with” is not a specification.
- If I want it adjusted in a year, what does that cost? With motorised, nothing. With fixed, a call-out.
- Which positions here are likely to change? Those are the ones to spend the lens money on.
We tune every lens on site before we leave
We walk the property, choose the lens per position rather than per quote, and email a fixed price within 24 hours. Every motorised camera is set to its final view on install day with you watching the screen. Every install is Fluke-tested, configured with your own passwords rather than factory defaults, and carries our 12-month workmanship warranty.
Book a free site walk or call 0800 222 546.
The models we fit
The LIZS and LZS letters in a Hikvision part number mean a motorised lens. The models below are the ones we reach for when the view cannot be settled from a drawing.
| Model | What it is | Resolution | Where we fit it |
|---|---|---|---|
| DS-2CD3666G2HT-LIZSUY | DeepinLight bullet, motorised zoom, Ultra Series deep-learning AI | 6MP | Long or awkward views that need setting on the day |
| DS-2CD3667G3-LIZSUY | DeepinLight bullet, motorised zoom | 6MP | Driveways and approaches |
| DS-2CD3687G3-LIZSUY/SL | DeepinLight bullet, motorised zoom, with deterrence | 8MP (4K) | Wide commercial views needing detail at distance |
| DS-2CD2T67G3-LIS2UY/SL-4MM | Fixed 4mm lens, ColorVu 3.0 smart hybrid light | 4MP | Standard residential runs where the view is known |
Motorised zoom is not digital zoom. It moves glass, so detail is real — but it costs more and it is only worth it where the view is uncertain or long.
Full list on our Hikvision camera range page.
Related reading
- The Hikvision camera range we install from — every model and what it is for
- 4MP, 6MP or 4K: how much resolution you actually need
- PTZ cameras: when a camera that moves is worth it
- Number plate recognition: why a normal camera will not read plates
Frequently asked
Can I adjust the zoom myself?
Yes, from the app or the recorder, on a motorised camera. We set it correctly on install day, so most people never touch it — but it is there when the hedge grows or the fence goes up.
Is motorised zoom the same as a PTZ?
No. Motorised zoom changes how much you see from a fixed direction. A PTZ physically turns to look elsewhere. A motorised camera always points exactly where it was mounted.
Does zooming in reduce image quality?
Optical zoom does not — the lens physically gathers more detail, so a zoomed view is genuinely sharper on the subject. Digital zoom, which just crops and enlarges, does reduce quality. Motorised lenses are optical.
Which lens should my driveway camera have?
Almost always motorised. Driveways are longer than people estimate, they are where you most want a face or a plate, and they are the position most likely to change. It is the single best place to spend the extra.
Do motorised lenses fail more often?
There is a small motor, so there is marginally more to go wrong than a fixed lens. In practice, on a camera set once and left, it is not something we see fail. The flexibility is worth far more than that risk on the positions that need it.
What is the difference between fixed and varifocal lenses on a CCTV camera?
A fixed lens is set at the factory and cannot be changed. A varifocal lens can be adjusted — by hand on a manual one, or remotely on a motorised one. Motorised means the view can be tuned from the ground once the camera is mounted.
What is the difference between a PTZ and a motorised varifocal?
A motorised varifocal zooms but does not move — it stays pointed where you fixed it and records that view constantly. A PTZ physically pans and tilts, so its view changes and it misses whatever it is not aimed at.
Who wrote this
Namra Shah installs CCTV and structured cabling across Auckland through Cabling For U. PSPLA Company Licence 25-132031 (Security Technician), SiteSafe Passport holder, Impac pre-qualified, $5M public liability. Cabling For U is a trading name of HARIKRUPA LIMITED, NZBN 9429046975126, incorporated 22 August 2018. Every install carries a 12-month workmanship warranty and Fluke-tested cabling.
The models named on this page are ones we hold accounts for and fit on Auckland jobs. If you want one specced for your property, ask for a free site walk.