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10-30-2017, 01:29 AM   #1
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took KP and DA 40 limited for the first walk and...

It was very bright day with strong sun most of the time.
The first 38 photos were nice, the the 39th came with surprise, large donut in the middle top of the image.
UFO, flare no idea? The donut stayed in the same position for 4 shots.
Nothing for a few shots and suddenly reappeared in the different spot, and slowly became more visible.
It changed location again.
See the attachements, I manipulated the settings so the donut is more visible.
Any idea , I should probably test it with different lenses.

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10-30-2017, 01:49 AM   #2
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Time for some Rocket Blower vs sensor action.
10-30-2017, 01:58 AM   #3
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Dust mote, or possibly a tiny insect. As Sandy says, time for the rocket blower
10-30-2017, 02:04 AM   #4
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but this thing is moving around and does not look like a dust on the sensor?

10-30-2017, 02:47 AM   #5
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QuoteOriginally posted by i_trax Quote
but this thing is moving around and does not look like a dust on the sensor?
It absolutely looks like something on the sensor. As for moving around, that's why I suspect it may be a tiny insect. I've had that happen before...
10-30-2017, 06:02 PM   #6
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It was very difficult for that insect to get some sleep with you setting off that shutter all the time, iTrax!
10-30-2017, 11:17 PM - 2 Likes   #7
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Hi, after prolonged blower cleaning, as recommended, the sensor seems to be very pleased.
Took some test shots with DA 40, FA 43 and FA 77, no more donuts!

Last edited by BigMackCam; 10-31-2017 at 01:27 AM.
12-09-2017, 08:43 AM - 1 Like   #8
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QuoteOriginally posted by i_trax Quote
Hi, after prolonged blower cleaning, as recommended, the sensor seems to be very pleased.
Took some test shots with DA 40, FA 43 and FA 77, no more donuts!
Looks like it was a dust particle, but looks like it moved around because of your cropping? The particle looks identical in all 3 shots just in different places. The smaller the aperture the more obvious these specs look.

In general, a prolonged blow job makes most everything very pleased.

12-22-2017, 07:35 AM   #9
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It looks like a small hair (maybe eyelash) or fiber (like from wool) that is on the sensor. It might move because of the shutter and mirror operation, which moves the air around inside of the mirror box.
I would dismount the lens, turn the camera sensor facing downwards, and use the in-camera sensor clean/shake function. Better yet, use a rocket blower and blow it out of the sensor (using other sensor cleaning function, which just exposes the sensor). Make sure you remove the hair out of the mirror box and out of the camera.

This debris could also be inside of the lens or on the back side of the lens element. Check those as well, though it is less likely.

QuoteOriginally posted by f22 Quote
In general, a prolonged blow job makes most everything very pleased.
Well said.
12-25-2017, 03:54 AM   #10
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I(we all) know this.

KP has something sticky bellow the sensor cover which vibrates so non sticky/oily garbage can be cleaned automatically but I have come across to particle which couldn't been blowed off or taken out with sticky lollipop so it was for wet cleaning
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