Zeiss Planar 35mm f/2 Contax G Dust Cleaning
Internal dust and small coating spots on a Zeiss Planar 35mm f/2 T* Contax G are cleaned professionally for a fixed €80, with a full function check included.
Symptoms
- Dust particles visible inside the Zeiss Planar 35mm
- Small spots or specks on the lens coating
- Debris visible when holding the lens up to the light
- Front element looks dirty even after external cleaning
If you can see dust inside your Zeiss Planar 35mm f/2 T* Contax G, or small spots forming on the coating, a professional Zeiss Planar 35mm Contax G cleaning solves both problems. This is a routine job for our lab: we clean the lens internally for a fixed €80, and the lens comes back looking — and performing — like it should.
The symptoms
The typical signs are easy to spot. Holding the lens up against a bright light, you see dust particles trapped between the elements. On closer inspection there may also be fine spotting on the coating — tiny dull specks that do not wipe off, because they are not on the outer surface. The owner of the lens in this case study noticed exactly that: internal dust plus a lightly damaged coating with visible spotting. Left alone, the build-up only increases, and heavier contamination starts to soften contrast in backlit shots.
What causes it
Contax G lenses are decades old, and none of them are weather-sealed. Over years of use, focusing and zooming pump air — and with it dust — into the optical path, where it settles on the internal elements. Coating spotting develops separately: age, humidity and storage conditions gradually attack the thin anti-reflective coating, leaving small marks on the glass surface.
Can you fix it yourself?
Not really. A blower and a microfibre cloth are fine for the outer surfaces — and worth using regularly — but that is where their reach ends. The dust you are seeing sits between the elements. Reaching it means opening the lens, and on a compact rangefinder design like the Contax G Planar there is very little room for error — a misaligned element or a fingerprint on an inner surface will do more harm than the dust ever did. Coating spots, in particular, cannot be treated without dedicated equipment. This is a job for a specialist Zeiss workshop.
How we repair it
A customer sent us her Planar 35mm f/2 T* with internal dust and light coating spotting. As a first step, our technician cleaned the elements using a medium/high-pressure air compressor to remove the loose dust residue. The lens was then examined in detail: having confirmed the coating spotting, it was disassembled and the affected surfaces were cleaned with specific equipment designed for delicate coatings.
With the internal dust removed and the light coating damage treated, the lens came back essentially as new. The optics were then inspected element by element to confirm nothing had been missed. Before returning it, we ran our standard final check — function test and general inspection — which is always included in the price.
Price and turnaround
| Service | Price |
|---|---|
| Internal dust and coating spot cleaning | €80 (fixed) |
| Internal cleaning | Included |
| Final test & general check | Included |
Typical turnaround is 5 working days from arrival at our lab, plus return shipping at a €20 flat rate 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 exactly how it works.
Frequently asked questions
How much does it cost to clean a Zeiss Planar 35mm f/2 Contax G?
Our internal dust cleaning for the Planar 35mm f/2 T* Contax G is a fixed €80, including disassembly, cleaning, reassembly and a full function check.
Does internal dust affect image quality?
A few small particles rarely show in photos, but heavier dust and coating spots can lower contrast and cause flare in backlit scenes. It also tends to get worse over time.
Can spots on the lens coating be removed?
In many cases, yes. Light coating spotting like the one on this lens can be treated with specific equipment during the internal cleaning. Deep coating damage cannot be reversed, so we always assess it during the free diagnosis.
Is it worth servicing a Contax G lens?
Absolutely. The Zeiss Planar 35mm f/2 T* is a sought-after lens with excellent optics, and a clean, well-serviced copy is worth considerably more than the cost of the cleaning.
