Tamron 18-270 Autofocus Not Working: Gear Repair
When the Tamron 18-270 stops focusing and the focus ring jams, broken internal AF motor gears are the usual cause. We replace them for a fixed €120.
Symptoms
- Tamron 18-270 autofocus not working
- Tamron 18-270 focus ring stuck, won't turn
- Lens stopped focusing after a knock or drop
- Manual focus jammed on Tamron 18-270
A Tamron 18-270 autofocus not working — with the focus ring seizing up completely — is a fault we know well, and it is very repairable. In most cases the AF motor itself is fine: the internal gears that drive the focus mechanism have broken, usually after a knock. We replace them at a fixed price of €120.
The symptoms
- Autofocus does not work at all: the lens no longer even attempts to focus.
- The manual focus ring is stiff or completely blocked and will not turn.
- The problem typically starts after the lens is knocked or dropped — often it still focuses manually for a while, then jams for good.
- The lens may also show visible dust inside the barrel.
What causes it
Tamron lenses have a notably complex internal construction, which makes them tricky to repair — and it means an impact can do damage that is not visible from outside. When an 18-270 stops focusing after a knock, there are two possible culprits: the autofocus motor itself, if the impact compromised it, or the mechanical side — the internal gears that support and drive the focus ring.
In the case study below, the impact broke the internal gears of the AF mechanism. With the gears gone, autofocus had nothing to drive and the manual ring, after a short period of forced use, locked up completely. This is the better of the two scenarios: a gear replacement is considerably simpler and cheaper than a full AF motor swap.
Can you fix it yourself?
There is little you can safely try. Check that the AF/MF switch is set correctly and that the lens contacts are clean, and test the lens on another body if you can. What you should not do is force the focus ring: if broken gear fragments are inside the mechanism, forcing the ring grinds them into the remaining parts and can turn a simple gear replacement into a bigger job.
Reaching the AF gear train requires a deep disassembly of a mechanically complex lens, followed by re-alignment of the optical groups — this is lab work. See our Tamron repair services.
How we repair it
A customer shipped us his Tamron 18-270mm f/3.5-6.3 Di II VC PZD after knocking it against a tripod during a photo shoot. From that moment autofocus stopped attempting to focus at all; manual focus worked for a while under force, then the ring jammed completely. The lens had also collected a fair amount of dust inside.
Our technician opened the lens and confirmed the good scenario: the AF motor was healthy, but the internal gears supporting the focus ring had broken in the impact. We replaced the internal AF motor gears, removed the dust from inside the barrel and re-aligned all the internal optical groups. After reassembly the lens focused perfectly again, the ring turned freely, and the final function check — included in the price — confirmed everything was back to spec.
Price and turnaround
| Service | Price |
|---|---|
| AF motor gear replacement, Tamron 18-270mm Di II VC PZD | €120 (fixed) |
| Internal cleaning | Included |
| Final test & calibration | Included |
Turnaround is around 7 working days from arrival at the lab. Return shipping is a flat €20 anywhere in the EU.
Ship your lens from anywhere in the EU — diagnosis is free and every repair is covered by a 6-month warranty. See how it works.
Frequently asked questions
Why is my Tamron 18-270 not focusing?
After an impact, the most common cause is broken internal gears in the AF mechanism: autofocus stops trying and the focus ring eventually jams completely. In this case the AF motor itself is often still fine.
How much does it cost to fix a Tamron 18-270 autofocus?
We replace the internal AF motor gears for a fixed price of €120, including internal cleaning and a full function check. Return shipping within the EU is €20 flat.
Can I fix a stuck focus ring by forcing it?
No — forcing the ring is usually what finishes the job. If broken gear fragments are inside the mechanism, turning the ring by force can jam it completely and damage more parts.
Is a Tamron 18-270 worth repairing?
Yes. At a fixed €120 the repair is well below the value of a working lens, and the job includes cleaning, optical alignment and a 6-month warranty.
