Large visible spot on xt20 sensor

[Bill Randall]

After a number of successful years with the x t20 I notice big dark spot on images. Inspected lens and sensor for what the cause is. It is a large visible spot on the sensor. It looks as if it could to hardened oil but not sure. I have ordered a cleaning kit but a few weeks away. 

What is the likely source of this stuff?  It is not dust so I am assuming oil. I have not changed lenses outside my office, but I recently purchased several used fuji lenses. I tried them all in my office and took each one out and tried it outside. Everything went well until today. I noticed the dark spot on the images. I did not need to stop down to see the dark spot on the images. The spot on the sensor is quite large and easy to see and when viewed with a loop the spot appears translucent on the perimeter and nearly opaque nearer the center. It looks dry or baked on. 

Anyone have an ideas what I'm dealing with. (This will be my first attempt at sensor cleaning, no good local repair shops-this is boonies.)

[ricadito]

I guess it´s only a grain of dust… If it were a dead pixel, you probably would see a small white dot.

[Bill Randall]

This was much larger than a bit of dust. I could see it on the sensor. It looked some kind of liquid dripped on on the sensor and hardened. I purchased sensor swabs and cleaner and it took two cleanings to get it all up. Everything is back to normal.

[Lom]

I have the same issue. I didn't change the lens or removed it in over a year but the spot recently appeared. I will add a photo soon after I make it small enough to be uploaded. Thanks,

Lom

[Bill Randall]

My problem was finally resolved. Don't change lenses if you have a sinus infection. I did a sensor cleaning with swabs etc. etc. and everything came out ok.

[Lom]

11 hours ago, Bill Randall said:

My problem was finally resolved. Don't change lenses if you have a sinus infection. I did a sensor cleaning with swabs etc. etc. and everything came out ok.

Hi Bill, thank you for your fast answer. I guess it's just another collateral damage of my bad allergies! I will look into cleaning the sensor. Thanks much happy new year,

Lom

Edited January 3, 2021 by Lom