Leica M9 image problems · Before you pay for repair
You open a photo and notice the same little marks again. Then you search “M9 sensor corrosion,” and suddenly a few spots feel like the end of the camera.
A spot in a photo is not enough to make that call. The useful first step is much simpler: check whether the mark is in the saved image, or only on the rear screen. From there, you can gather the right evidence without touching the sensor.
Want help deciding what to do with yours? Start with the Mad Labs repair request form. Tell us the exact model, what appears in the original files and any cleaning or repair history. We can review the request and look into the next step.
Keep the camera with you for now. A request is not a confirmed repair booking, a diagnosis or a final quote. Wait for agreed next steps before mailing anything.
This guide is for the original CCD M9 family: the M9, M9-P, M-E (Typ 220) and, where noted, the original CCD Leica M Monochrom. It is not a corrosion guide for the M10, M11, later CMOS Monochrom models or every camera carrying the Leica name.
Start with the file, not a photo of the screen
Open an affected original image on a computer. Keep the original untouched and inspect a copy at a useful magnification. If you already have both a DNG and a camera JPEG from that exposure, keep both. A phone photo of the camera's LCD is helpful for a display complaint, but it is a poor substitute for the actual image file.
Describe a screen problem first
A mark that stays in the same place on the LCD while you browse different photos, but is absent from those files on a computer, points toward a display-side issue rather than a recorded image defect.
Note whether you also see it over menus. Send a photo of the screen plus an original file that looks normal elsewhere. Do not book sensor-glass work on that evidence alone.
Keep a few original examples
Now the question is about the recorded image. Save one ordinary photo, one where the problem is easy to see and, if you have it, an older photo from before you noticed it.
If only one app or export shows the fault, say so. Check an untouched copy in another suitable viewer before treating an editing or display problem as damage inside the camera.
Two problems can exist at once. A scratched LCD does not rule out image spots, and clean-looking playback on the small screen does not prove that the full-resolution file is clean. This check narrows the conversation; it does not certify the camera.
Use the pattern as a clue, not a verdict
Dust on the sensor cover glass can leave dark marks in photographs. Leica also documented a separate cover-glass corrosion problem in this CCD family, with image effects particularly noticeable at smaller apertures. That overlap is why “I can see dots at f/16” does not settle the dust-versus-corrosion question.
| What you notice | Useful next observation | Do not conclude |
|---|---|---|
| Small spots in similar places across several photos | Compare uncropped originals in the same orientation. Note whether the marks are easier to see against plain areas. | That fixed-position spots must be corrosion. Surface contamination can also repeat. |
| Spots become clearer when you stop the lens down | Record which aperture you used and keep both example files. | That aperture behavior identifies the material or tells you whether cleaning will work. |
| A bright center, ring or irregular-looking mark | Keep the unedited file as well as any crop that helps point out the area. | That a shape matching an internet example confirms corrosion. Resizing, sharpening and compression can change appearances. |
| Straight lines, a large colored region or part of the frame missing | Record whether it is in the actual file, whether it happens every time and whether earlier images show it. | That a glass-only repair is appropriate, or that one particular electronic component has been identified. |
| Marks remain after a previous cleaning | Include when it was cleaned, who did it and what changed afterward. | That persistence alone proves corrosion. The cleaning method, residue, scratches and other faults still matter. |
What about the M9 “purple curtain”?
Owners use that phrase for a large purple or magenta image failure on a color M9. It belongs in a different assessment from a few dust-like spots. Electronic sensor faults can produce large image defects; changing the glass does not repair a failed CCD. A sample alone still cannot identify every possible cause in the camera or file path.
If yours is an original CCD Monochrom, describe lines, bands, missing image areas or other tonal defects rather than expecting a color-camera symptom to look the same. Its repair options also need separate confirmation.
A useful description sounds like this: “The line is in the DNG on my computer, in the same position in five pictures. I first noticed it last week.” That is more useful than choosing a diagnosis from a matching thumbnail.
Three very different things get called “sensor repair”
Before comparing estimates, ask what the work actually changes. Cleaning a surface, replacing its glass and replacing the image sensor are different jobs.
A simple way to keep the parts straight
Dust or other contamination may be sitting on the cover glass.
The optical glass over the CCD is the part involved in the documented M9-family corrosion issue.
The light-sensitive sensor and its electrical connections have a different job: creating and passing along image information.
Cleaning: remove contamination
A suitable professional cleaning may address surface dirt. It cannot restore glass that has chemically degraded. If you do not know which you have, the next step is an assessment, not repeated attempts to scrub away a stubborn mark.
Ask whether the proposed cleaning includes checking the complaint in image files. “Cleaned” and “the reported marks are gone” answer different questions.
Glass replacement: keep a suitable existing CCD
Specialist cover-glass replacement can be an option for some cameras. It replaces the affected optical glass while retaining the underlying sensor. Suitability depends on the assembly and its condition; visible spots alone cannot establish it.
Ask what glass is proposed and whether the intended result is normal visible-light photography. You should understand any proposed optical change before agreeing to it.
Sensor replacement or wider fault assessment
An electronic CCD fault needs a different solution from new cover glass. A complete sensor replacement may be considered only where a suitable replacement and an accepted service path exist. It is not a repair to assume is available for every body.
Original CCD Monochrom owners: do not assume a whole-sensor option for a color M9 also covers your camera. Confirm your exact model before considering that route.
Glass work has real risks. Damaged glass can crack during removal; debris, adhesive problems or damaged connections may complicate the job. Inspection can find that proceeding is too risky or not feasible. A successful glass replacement also does not make every aging electronic part new.
Before authorizing work, ask what risks apply to your camera, what happens if the plan changes and what you would owe if it is returned unrepaired.
Gather evidence with the camera closed
You do not need to expose the sensor, enter a service menu or take the body apart to make a useful repair request. Existing photos and a short history are enough to start.
- Back up the original files. Copy them without resizing or retouching. Keep the originals even if you make a marked-up copy to show where to look. Do not format the card or reset the camera as a first response to spots.
- Separate what you know from what you suspect. “Visible in the saved JPEG” is an observation. “Corroded sensor” is a possible explanation. Include whether the DNG, if available, shows the same issue.
- Look through photos you already have. Do the marks appear in multiple scenes? Did the problem start abruptly or only become obvious when you photographed a plain background? If you already used different lenses, note the results. You do not need to borrow lenses or keep swapping them for this request.
- Keep the context. Include the lens, settings you know, approximate date and whether the issue is constant or intermittent. A wider original frame helps show a pattern that a tiny crop can hide.
- Stop if there is a separate damage concern. A recent liquid incident, a damaged battery, unusual heat or mechanical trouble is a reason to stop operating the camera and describe that first. Do not run more tests just to complete this list.
If you want one simple comparison
If the camera otherwise operates normally, you can make a pair of ordinary photographs of an evenly lit plain wall with the lens attached: one at a wider aperture and one stopped down, such as f/11. Use settings that give a sensible exposure and note the aperture you selected. There is no need to photograph the sun or open the camera.
This is only a way to document when marks are visible. It is not a corrosion test, and a clean-looking pair does not guarantee a healthy sensor. If you already have clear examples, skip it.
Leave the sensor surface alone during this check. No polishing, scraping, solvents or repeated wet cleaning to see whether a mark will disappear. Do not use canned high-pressure air or blow into the body with your mouth.
Leica's M9 instructions warn about damage from inappropriate cleaning and state that user-caused sensor-cleaning damage is not its responsibility. Suspected glass deterioration is a reason to seek advice, not to apply more pressure.
If it has already been cleaned, be straightforward about it. Include the method or product if you know it, and whether the spots changed, moved or stayed the same. That information is useful; you do not need to repeat the cleaning to prove anything.
“The sensor was replaced” needs a little more detail
A used M9 may have years of service history that did not come with the camera. Even an honest seller's “sensor replaced” description may leave important questions unanswered.
Look for an invoice or service report showing the camera's identity, the date and the actual work. Was the entire sensor assembly changed, was the cover glass replaced, or was the camera cleaned? Keep any documented sensor or glass information with that record.
The body name and serial number identify the camera, but they do not by themselves establish which sensor or glass is installed today. A model suffix is not a health certificate. Neither is an undocumented sensor-ID number copied into a sales listing.
If the paperwork is missing, say “history unknown.” Do not guess a sensor generation from the year you bought it. There is no need to access hidden menus or change settings to complete a Mad Labs request.
The old free-replacement announcements are historical
Leica acknowledged the cover-glass issue and offered a goodwill sensor-replacement arrangement. Those old announcements still appear in searches. They explain the history; they do not establish free service eligibility today.
Manufacturer service options have changed since then. Before authorizing paid work, check any existing repair warranty and confirm current manufacturer or trade-in options for your camera and location. Do not assume that an old price, upgrade offer or regional service list still applies.
If someone offers a warranty with a proposed repair, ask what it covers: the replacement glass, the sensor electronics, labor, shipping or some combination. A promise about corrosion should not be read as coverage for every possible future camera fault.
Is this particular M9 worth repairing?
You may want to keep it because you enjoy using it, know its history or simply do not want a different camera. Those are reasonable reasons to investigate repair. They are not reasons to approve work without understanding the total and the risks.
There is no honest universal price for “M9 sensor corrosion repair.” First establish whether the proposal is cleaning, glass replacement, a whole-sensor replacement or assessment of another fault. Then compare that specific plan with a suitable replacement camera.
What am I trying to keep?
This body, its known history, the CCD shooting experience or just a working camera? Your answer changes which alternatives are worth considering.
How healthy is the rest of it?
List existing shutter, rangefinder, display, control or battery concerns. A sensor-related quote should not quietly stand in for a complete overhaul.
What is the full amount at risk?
Ask for assessment charges, proposed work, tax, shipping and transit coverage, plus any return or cancellation charges if the repair cannot proceed.
What would I buy instead?
Compare with a genuinely suitable working replacement, its documented condition and its warranty. Another undocumented M9 could leave you with the same unanswered questions.
Put the estimate through these questions
- Is the proposed work tied to the actual complaint? Make sure the saved-file problem you reported is the one being assessed.
- What findings would stop the job? You should know when inspection might lead to a revised proposal or a recommendation not to proceed.
- Does a higher-risk step need separate approval? Agree on how changes to the scope, parts or price will be handled before work begins.
- What will be checked afterward? Ask how the original image defect will be evaluated and what repair record you will receive.
- What is the expected timing? Confirm it for the actual proposed work. Do not plan an important shoot around an unconfirmed turnaround.
Repair can be a sensible choice when the work is suitable, the risks are acceptable and the total fits what the camera is worth to you. Replacement can be the better choice when several faults are involved, the required work is unavailable or the uncertainty outweighs the benefit.
You can also decide not to proceed. Asking for an assessment does not mean you have committed to saving the camera at any cost. If you later sell it as faulty, keep the symptom description and known service history accurate for the next owner.
Send Mad Labs the evidence before you send the camera
Start with the Mad Labs repair request form. You do not need a technical diagnosis. A few specific observations make the request easier to review.
Include these six things
- Exact model: M9, M9-P, M-E (Typ 220) or original CCD M Monochrom. If you are unsure, include a photo of the model marking.
- Where the problem appears: on the LCD only, in original files on a computer, or both.
- Original examples: keep a few full-resolution files ready, ideally DNG and camera JPEG where you already have them. Ask how to provide files if the form does not accept them; a screenshot alone may not be enough.
- What changed: when you first noticed it, whether it is intermittent, and any drop, liquid exposure, cleaning or other event around that time.
- Service history: invoices, previous sensor or glass work and any remaining repair coverage. “Unknown” is fine.
- Your decision constraints: a spending limit, a deadline, a wish to keep the original body or a preference to compare replacement.
We can review those details and investigate whether there is an appropriate next step. If a suitable repair provider accepts the case, that provider confirms repairability, scope and price after any necessary physical assessment. Any service arrangement, who will handle the work and applicable terms should be clear before you agree to proceed.
Wait for acceptance and packing instructions
Do not mail the camera simply because you have submitted a form. Confirm the destination, what to include, any assessment charge and the return arrangements first. Ask specifically whether a lens, battery or memory card is needed rather than sending your whole kit by default.
Back up your photographs before any handoff. For a valuable body, also confirm appropriate packaging and transit coverage in both directions. Keep your records and tracking information with the repair correspondence.
A few questions that come up with M9 spots
Can a photograph prove that my M9 has corrosion?
No. Original files can show the pattern and help narrow the assessment, but they cannot reveal everything about the glass, adhesive, connections or underlying sensor. A compressed image is even less conclusive.
Can I keep shooting at wider apertures to hide the marks?
You may find the marks less visible in some pictures. That changes how noticeable they are, not what is causing them. Keep original examples and seek an assessment if they persist; do not treat a clean-looking wide-aperture photo as a guarantee that nothing needs attention.
Should I ask for a whole sensor instead of new glass?
Ask for the fault and proposed scope to be established first. More extensive work is not automatically the right work, and an available option for one M9-family model may not exist for another.
Is a camera with an earlier sensor repair risk-free?
No. Documentation helps explain what was changed, but the current condition still matters. Confirm the repair details and any remaining coverage rather than relying on “upgraded sensor” in an old sales description.
Can a photo tell you what repair is needed?
A photo can help explain what you are seeing, but it cannot establish the full scope of sensor work. Send the model, symptom history and available original-file evidence to Mad Labs first. If a suitable repair provider accepts the case, that provider confirms the required assessment, repair scope and price before you decide whether to proceed.
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