Why My Teleconverter Suddenly Stopped Working (And the Simple Fix)

Wildlife photography rarely goes exactly as planned.

During a recent trip to Badlands National Park and the Black Hills of South Dakota, I ran into a problem that had me convinced something was wrong with my camera gear. My teleconverter was behaving erratically, autofocus would suddenly stop working, and sometimes both the electronic viewfinder and rear LCD would briefly go blank.

At first, I assumed I was dealing with an electronic failure. Fortunately, the solution turned out to be much simpler.

The Problem

The issue appeared without warning.

Everything would work normally for a while, and then suddenly the camera would stop responding the way I expected. I’d lose autofocus, miss a wildlife opportunity, and spend the next few minutes trying to figure out what had happened.

What made the problem especially frustrating was its inconsistency. The camera might work perfectly for several minutes while photographing wildlife, only for the issue to return without any obvious trigger.

Intermittent problems are some of the hardest equipment issues to diagnose. Just when I thought I had identified the cause, everything would start working normally again, making it difficult to determine whether I’d actually fixed anything.

When you’re traveling and photographing wildlife, that uncertainty can be almost as frustrating as the problem itself.

Trying to Diagnose the Cause

My first thought was that there was a problem with the camera body, lens, or teleconverter electronics.

I removed and reattached the teleconverter multiple times. I checked camera settings and cleaned the lens and teleconverter contacts. I also tried using the lens without the teleconverter attached. In that configuration, everything appeared to work normally, which suggested the problem was related to either the teleconverter itself or the connection between the lens and teleconverter.

Even with that clue, I still couldn’t determine the exact cause. The problem remained frustratingly intermittent, making it difficult to know whether I had actually fixed anything or if the issue had simply decided not to appear.

That evening, I continued shooting while working around the problem, but I was concerned that it might get worse during the remainder of the trip.

The Surprisingly Simple Fix

The next morning, I stopped at Wall Drug and picked up a small eyeglass repair kit.

While looking over the teleconverter and lens, I noticed that some of the small screws appeared slightly loose. Using the precision screwdriver from the repair kit, I carefully tightened the screws on both the teleconverter and the lens.

That was it.

After tightening the screws, the autofocus problems disappeared completely. The viewfinder and LCD never went blank again, and the system worked flawlessly for the rest of the trip.

Why Loose Screws Can Cause Problems

Modern teleconverters rely on precise alignment between the camera body, teleconverter, and lens. Not only do the optical elements need to stay properly aligned, but the electronic contacts must also maintain a reliable connection.

Screws can gradually loosen from vibration, travel, or regular use and even tiny amounts of movement can potentially interrupt communication between components. The result may look like an electronic failure when the actual cause is simply a loose mechanical connection.

While not every autofocus problem can be solved this way, it’s certainly worth checking before assuming your equipment needs repair.

Lessons Learned

This experience reminded me of a few simple but valuable maintenance habits:

Pack a Precision Screwdriver

A small eyeglass or jewelry screwdriver takes up almost no room in a camera bag. It can be invaluable when traveling, especially in remote locations where camera stores and repair shops aren’t nearby.

Check Screws Periodically

Lens and teleconverter screws can loosen over time from normal use, vibration during travel, and repeated mounting and dismounting.

A quick annual or semi-annual inspection can help identify potential problems before they affect a photography trip.

Don’t Assume the Worst

When gear starts behaving strangely, it’s easy to jump to the conclusion that an expensive repair is needed. Sometimes the solution is much simpler.

Before sending equipment in for service, it’s worth checking the obvious mechanical items first.

Final Thoughts

This was one of those photography lessons that I won’t soon forget.

A problem that seemed like a serious electronic failure was solved with a screwdriver that cost only a few dollars. More importantly, it prevented me from missing additional wildlife opportunities during the trip.

A small precision screwdriver is now a permanent part of my travel photography kit. Hopefully this experience helps you avoid the same frustration if your teleconverter ever starts acting up in the field.

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