BigBabyMoses06 wrote:
Anyone know how a piece of dust could get under the sensor glass? I have a nice little round spec on(under) my sensor glass, noticed in my photos last night. Pretty baffled...and a bit anxious on what this might cost to clean or repair. I cleaned the sensor top several times to no avail. Kicking myself for buying used this time 🫪
For what is worth, this happened to me on my A7R V. Sony Nordic called it normal "wear and tear" but the seller covered a full sensor/ shutter assembly replacement. Most recently, I had a random encounter and friendly discussion over drinks with someone working at a camera repair center in another European country that they also act as the local Sony authorized repair center.
He more or less told me that in Sony cameras with ultrasonic sensor cleaning are subject to dust under the glass. Not that it happens frequently enough to warrant public outcry, but it does so more frequently than from other Sony models and other brands (except in the case of the first two gens of Fujifilm cameras). Essentially, if you use a rocket blower to blow air against the sensor, there is a very small chance of creating enough negative pressure within the sensor chamber to lift the protective glass and get dust underneath it. I believe that's what happened to me as I was removing a different piece of dust from the sensor using a filtered air blower –and that's how I cleaned countless sensors in the past, including from an A7 IV with no issues. The guy added that he thinks that with some zooms lenses pump enough air that may cause it during normal use too, but it is far far less likely. A quick search and you will find posts about A1s and A7R Vs with the same issue, but not for the third-gen or A7R IV cameras.
To be clear, Sony has not acknowledged this as an issue AFAIK; neither in their tech manuals nor in public. It is simply the observations provided by a third party. With that said, ever since, I am more inclined to go straight to a wet clean or use a SensorKlear from LensPen than use a rocket blower. I had no issues ever since. None of my friends and family who use Sony gear had this either, but I had long time now advised them against using air blowers on their sensors.
BigBabyMoses06 wrote:
Anyone know how a piece of dust could get under the sensor glass? I have a nice little round spec on(under) my sensor glass, noticed in my photos last night. Pretty baffled...and a bit anxious on what this might cost to clean or repair. I cleaned the sensor top several times to no avail. Kicking myself for buying used this time 🫪
For what is worth, this happened to me on my A7R V. Sony Nordic called it normal "wear and tear" but the seller covered a full sensor/ shutter assembly replacement. Most recently, I had a random encounter and friendly discussion over drinks with someone working at a camera repair center in another European country that they also act as the local Sony authorized repair center.
He more or less told me that in Sony cameras with ultrasonic sensor cleaning are subject to dust under the glass. Not that it happens frequently enough to warrant public outcry, but it does so more frequently than with other Sony models and other brands (except in the case of the first two gens of Fujifilm cameras). Essentially, if you use a rocket blower to blow air against the sensor, there is a very small chance of creating enough negative pressure within the sensor chamber to lift the protective glass and get dust underneath it. I believe that's what happened to me as I was removing a different piece of dust from the sensor using a filtered air blower –and that's how I cleaned countless sensors in the past, including from an A7 IV with no issues. The guy added that he thinks that with some zooms lenses pump enough air that may cause it during normal use too, but it is far far less likely. A quick search and you will find posts about A1s and A7R Vs with the same issue, but not for the third-gen or A7R IV cameras.
To be clear, Sony has not acknowledged this as an issue AFAIK; neither in their tech manuals nor in public. It is simply the observations provided by a third party. With that said, ever since, I am more inclined to go straight to a wet clean or use a SensorKlear from LensPen than use a rocket blower. I had no issues ever since. None of my friends and family who use Sony gear had this either, but I had long time now advised them against using air blowers on their sensors.
Sep 28, 2026 at 09:59 AM
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