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05-15-2018, 03:51 PM   #1
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Smear problem on k-50 Sensor/Low Pass Filter.

My Pentax k-50 has approximately 4500 shutter actuations and it is in very good to excellent condition. Two days ago we had some wonderful weather so I grabbed my gear and off I went. After uploading I viewed my photos and noticed a horizontal looking broken streak at the top right. I changed lenses and took photos of half of a picture on a wall, and the smear appeared. I went over the picture with a flashlight and did not notice any smear on the wall. I then decided to clean the sensor and once done, took another few snaps and the smear still appeared in the photo. I then decided to clean the area again, only this time with a little more force, then took another few photos and the smear was gone. On the swab appeared some black goo type material. It begs the question, How the hell did black goo managed to migrate onto the sensor, and from where inside the body? Something had to come in contact with the sensor in order to leave this gunk on it.

Any helpful hints/suggestions are greatly appreciated.


05-16-2018, 02:28 AM   #2

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Lubricant out of a lens?
05-16-2018, 11:32 AM   #3
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I change lenses frequently outdoors, while the previous respondent's suggestion is most likely, it is also likely that a small bug got in your mirror box and then got squashed on the sensor (which is what happens in most of my cases... I'm always having to clean that sensor from spring-fall).
05-16-2018, 01:52 PM   #4
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Thanks very much for all the helpful responses. I received an answer to my question and my dilemma. It appears as though both Nikon and Pentax had the same event happen because of over lubrication at the factory on the shutter. In time, this caused the problem of oil splashes on the sensor or Low Pass Filter. Easy enough to control by keeping the sensor clean at all times.

Thanks again,



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goo, k-50, k-50 sensor/low, pentax service, photos, picture, problem, repair, sensor, service, smear, wall, warranty
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