Where’s the “Carl Zeiss” Ring?
Why Funleader Conversion Lenses Don’t Carry the Original Name Ring
The optical assemblies are genuine original Contax/Carl Zeiss components. The front ring is not — and there’s a good reason for that.
One question we hear often
“We understand that the optics are original Contax. But if the glass is genuine Carl Zeiss, why doesn’t the front ring say so?”
It’s a fair question. The optics inside our lenses are genuine original Contax components, so why doesn’t the lens carry the original Carl Zeiss name ring?
The short answer is simple: the front ring on our conversion lenses is a Funleader-made component.
The longer answer involves a Hong Kong service center, a rare batch of untouched factory spare parts, and a decision we made early on about what a conversion should — and shouldn’t — be.
Where Our Optics Come From: A Time Capsule from the 1990s
Our complete-lens offering exists because of an unusually rare find.
In the 1990s, the Contax brand was owned by Kyocera of Japan. The Contax G system was widely sold across Asia, and Hong Kong served as the location of the region’s official service center. Like any authorized service center, it maintained a stock of genuine factory spare parts for repairs — including optical assemblies for Contax G-series lenses.
Then the digital era arrived. Contax gradually disappeared from the market, and the service center eventually closed. But some of those spare parts remained untouched, preserved for decades.
Years later, Mr. Ding acquired a batch of these genuine Contax service-center optical assemblies.
They were new old stock: factory-original, never mounted, never used, and never modified.
That batch became the foundation of the Funleader × MrDing non-destructive conversion project — and, eventually, our complete lenses.
There is one important detail, however:
The original front name rings were not part of the batch.
On Contax G lenses, the front ring is engraved with the individual lens’s serial number. It belongs to that specific lens and stays with it throughout its life. Service centers therefore stocked optical assemblies as replacement parts, but not the individual name rings attached to complete lenses.
So when we build a complete lens from these original spare parts, there is no original front ring to put back on.
Why We Don’t Reproduce the Original Ring
So why not simply make a replica with the original “Carl Zeiss” engraving?
There are two reasons — one about identity, and one about integrity.
Every original ring belongs to a specific lens.
The original ring carries a serial number corresponding to that individual lens. A reproduction would either have to use a serial number belonging to another lens, which would be misleading, or omit the serial number entirely, in which case it would clearly not be an original ring.
Neither approach feels right to us.
And the “Carl Zeiss” name belongs to Carl Zeiss.
Funleader is an independent manufacturer. We believe the parts we make should be clearly identified as our own, rather than reproducing another company’s branding.
That’s why our front ring carries the Funleader name.
It tells you exactly what it is: a Funleader-made component surrounding genuine original Contax/Carl Zeiss optics.
We think that distinction matters.
Why We Don’t Convert Second-Hand Lenses
A natural follow-up question is:
“If the original ring matters so much to customers, why not buy complete used Contax G lenses, convert them, and keep the original ring?”
The answer comes down to consistency.
The second-hand market is unpredictable. A used Contax lens may have haze, fungus, cleaning marks, decentered elements, worn mechanics, or simply years of unknown history. Even lenses of the same model and age can be in very different condition.
If we converted used lenses, every unit would start from a different baseline. We could inspect and test them, but we could not guarantee the same starting condition from one lens to the next.
And “mostly fine” is not a specification we want to build around.
The service-center optical assemblies are different.
They come from the same original batch, from the same source and era. They were preserved as spare parts, never mounted on a camera, and never modified.
That gives us something the second-hand market cannot: repeatability.
When we build a complete lens, we know exactly what is inside because we assembled it ourselves from original components whose provenance and condition we can verify.
That consistency is at the heart of our non-destructive approach.
The G28 Case: Provenance Matters
There is one example that makes this sourcing story especially clear: the Contax G28.
The original service-center batch did not include G28 optical assemblies.
That is why we do not offer a complete G28 lens.
Instead, the G28 Helicoid is sold separately, allowing users to bring their own original G28 optics.
We could have chosen to source used G28 lenses and convert them, but that would go against the same principle we apply across the rest of the project: we would rather offer less than compromise on consistency and provenance.
We understand why people love the original Contax ring. It is beautifully made, instantly recognizable, and carries a piece of Contax history.
But we’d rather explain our choice a hundred times than sell a product that pretends to be something it isn’t.
The optics are original.
The conversion is ours.
And the ring is ours too.
We believe that distinction is worth explaining — even if we have to answer the question a hundred times.
— Funleader × MrDing Studio