Hasselblad H4D Sensor Cleaning & Filter Service
Sensor cleaning on a medium format Hasselblad H4D, including replacement of a damaged low-pass filter. A specialist job we perform at a fixed price.
Symptoms
- spots or dust visible in every photo from the H4D
- marks on images that do not change with the lens
- scratched or damaged low-pass filter over the sensor
- haze or blemishes visible on the sensor surface
Dust and marks on every frame from a medium format back call for professional Hasselblad H4D sensor cleaning — and sometimes, as in the repair described here, the low-pass filter protecting the sensor turns out to be damaged and needs replacing too. We handle both at a fixed price of €350, with free diagnosis first.
The symptoms
Sensor contamination on the H4D shows up the same way it does on any digital camera, only larger:
- Dark spots or smudges in the same position in every photo, most visible at small apertures.
- Marks that stay put when you change lenses — proof the problem is on the sensor, not the glass.
- In more serious cases, permanent blemishes caused by a scratched or deteriorated low-pass filter, which no amount of cleaning will remove.
What causes it
Dust settles on the sensor of any camera with interchangeable lenses or a removable digital back. On the H4D, the sensor is protected by a low-pass filter that sits directly above it, locked in place by a metal frame. Normal contamination sits on this filter and can be cleaned off — but if the filter itself is damaged, as it was on the camera in this case study, the defects are in the glass and the only remedy is replacement.
Can you fix it yourself?
Loose dust can sometimes be removed with a hand blower, and that is always worth trying first. Anything beyond that is risky on a medium format back: the sensor assembly is large, expensive and unforgiving, and an improvised wet clean can drag abrasive particles across the surface and scratch it. Diagnosing a damaged low-pass filter — and replacing it — requires separating the digital back from the body and removing the filter's retaining frame, which is strictly a lab job.
How we repair it
A customer contacted us about his Hasselblad H4D for a sensor cleaning. On inspecting the camera, our technicians found that the protective filter over the sensor was damaged and had to be replaced as well. They detached the digital back from the body to assess the sensor, then removed the metal frame that locks the low-pass filter in place, freed the damaged filter and fitted the new one.
For the cleaning itself, the sensor was first blown down with compressed air at low pressure — deliberately low, so that any debris could not scratch the surface during cleaning — and then finished by passing a special fibre paper soaked in isopropyl alcohol across the sensor surface. With the new filter fitted and the sensor spotless, the camera passed its final function check and went back to the customer. Every Hasselblad repair we perform includes that final general inspection.
Price and turnaround
| Service | Price |
|---|---|
| Sensor cleaning + low-pass filter replacement, H4D | €350 (fixed) |
| Internal cleaning | Included |
| Final test & calibration | Included |
Typical turnaround is 7 working days from arrival at our lab. Return shipping anywhere in the EU is a flat €20.
Ship your Hasselblad from anywhere in the EU — free diagnosis, fixed price, 6-month warranty. See how it works.
Frequently asked questions
How much does Hasselblad H4D sensor cleaning cost?
Our fixed price is €350, which in this case included replacing the damaged low-pass filter that protects the sensor. A full function check is always included.
What is the low-pass filter and why would it need replacing?
It is the protective filter that sits directly over the sensor, held by a metal frame. If it gets scratched or otherwise damaged, the marks appear in every photo and cleaning alone cannot remove them — the filter has to be replaced.
Can I clean a medium format sensor myself?
A gentle blower can shift loose dust, but medium format sensors are large and expensive, and wet cleaning done wrong can scratch the surface. If a blower does not solve it, leave it to a lab.
Do you work on medium format cameras like Hasselblad?
Yes — the H4D in this case study is a typical example. Medium format bodies and digital backs require different disassembly procedures from 35mm-format cameras, and our technicians handle them regularly.
