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03-18-2011, 05:08 AM   #1
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Stains on K-x Sensor?

My K-x is now about 10 months old. I have never really thought to check for stains like those seen with the K-5, but after looking at some recent vacation pictures at small apertures (f/14) I am very very concerned! I attached a picture below. The stains/spots disappear at larger apertures. I will do more formal tests with different lenses etc later.
Any input/feedback would be appreciated

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03-18-2011, 05:15 AM   #2
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Those are dust spots, get your blower out and give yours lenses and sensor a blow
03-18-2011, 05:27 AM   #3
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Take a picture of a light blue sky, you will see them better
03-18-2011, 05:43 AM   #4
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Dust, a much older story than stains.

03-18-2011, 05:49 AM   #5
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For that, you need this
03-18-2011, 05:56 AM   #6
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What about the stain/discoloration by the tree branch?
03-18-2011, 07:54 AM   #7
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QuoteOriginally posted by tbirdas Quote
What about the stain/discoloration by the tree branch?
Lens flare - you're shooting into the sun, after all.
03-19-2011, 03:46 AM   #8
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QuoteOriginally posted by tbirdas Quote
What about the stain/discoloration by the tree branch?
With the kx you have this option, or take a sky picture.....no cloud.....no sun

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03-20-2011, 03:50 AM   #9
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Personally I don't trust the dust detection on my K-7 nor my wife's k-x.

There are plenty of times when i run that dust detection test and it says there are HUGE particles of dusts on the sensor. But when u take a photo of the blue sky at F22 and inspect the pics on the PC, there are zero dusts to be found...or it is too small to get noticed.....this sorta contradict with the dust detection result esp. when it says i have a dust streak running from top to bottom.

I would say use mother nature's blue sky as the best test to see if the sensor is bugged by dusts or not.
03-20-2011, 01:09 PM   #10
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Your first step should be to try a blower but I had the same concern as you did, the discoloration around the tree branch is definitely not dust and for some reason does not look like flare to me. If the blower does not work and it is in fact stains then you still have some time left for warranty.
03-20-2011, 03:53 PM   #11
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It probably has more to do with where I take my K-x than anything else, but I have had more instances of sticky stuff on the sensor of the K-x that required liquid cleaning.
03-20-2011, 04:05 PM   #12
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The spot by the tree could be a droplet of water. Did you shoot with this lens in rain or sea spray at any time? As bikecoboss suggests, though, it could also just be lens flare. Also, do the spots appear in the same places if you try a different lens? If so, it's definitely on the sensor, if not it's on the lens. Either way it doesn't look anything like K5 stains. I think if there was a problem with stains on the k-x there would have been a hue and cry by now.
03-21-2011, 12:31 AM   #13
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QuoteOriginally posted by raider Quote
Personally I don't trust the dust detection on my K-7 nor my wife's k-x.

.
I agree with you, but I wanted to show him option avalaible. dust is a lack in dslr camera. it goes in when you change lens, and cheap lens not sealed eventualy let dust in. And I guess (not sure about it, could someone confirm) condensation in cold weather in winter when you come inside with the camera not in a bag, could do that,

I use a cleaning kit, it's not that hard.
03-21-2011, 07:02 AM   #14
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QuoteOriginally posted by raider Quote
Personally I don't trust the dust detection on my K-7 nor my wife's k-x.

There are plenty of times when i run that dust detection test and it says there are HUGE particles of dusts on the sensor. But when u take a photo of the blue sky at F22 and inspect the pics on the PC, there are zero dusts to be found...or it is too small to get noticed.....this sorta contradict with the dust detection result esp. when it says i have a dust streak running from top to bottom.

.
You need to heed part two in the manual (see above). You can fool the dust alert system by pointing the camera at something contrasty. The dust alert will then see the edges of the contast as spots. That's why you likely had what appeared to be a streak.
03-21-2011, 03:24 PM   #15
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QuoteOriginally posted by Painter Quote
You need to heed part two in the manual (see above). You can fool the dust alert system by pointing the camera at something contrasty. The dust alert will then see the edges of the contast as spots. That's why you likely had what appeared to be a streak.
Good point. I will try this next time.
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