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04-03-2011, 05:53 PM   #1
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K-5 from new batch: is this a stain or a dust?

New k-5 body from Amazon, serial number:4002XXX, manufacturer data: 2-18-2011, shutter count 0. In the first test shots, a dark spot showed up after f/22. The attached pictures are f/40. Does it appear to you a stain or a dust? Is it normal that a new camera has this? What should I do with it now? (clean it myself? or return it?)

(I've done some research on the "stain" issue and thought it should be handled well already. And the data from k-5 serial number database has sort of confirmed this fact. I'm not trying to prove anything based on my personal case. In fact, this is my first DSLR, and I really some advice from you guys. Thanks in advance!)


Last edited by kesong; 10-12-2014 at 08:59 PM.
04-03-2011, 05:54 PM   #2
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Dust. A stain looks like this:


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04-03-2011, 06:08 PM   #3
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I had the exact same situation, and they all turned out to be dust. 398xxxxxx. Just use a blower and it will come off.
04-03-2011, 08:03 PM   #4
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Adam and PixleFish, thanks a lot for your replies!
I'll try to clean the sensor then.

04-03-2011, 09:58 PM   #5
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QuoteOriginally posted by kesong Quote
Adam and PixleFish, thanks a lot for your replies!
I'll try to clean the sensor then.
I hope you use something like the venerable Rocket Blower. I got mine for around ten clams and it's become invaluable for me.
04-03-2011, 11:58 PM   #6
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Tahroja voi tulla viellä kuukausia jälkeenkinpäin kennoon. Riippuu varmaan kuinka paljon kuvataan suhteessa aikaan + - 2000 kuvaa alkaa jo näkymään. Itse ihmettelen tätä pölly herkkyyttä, ei esimerkiksi K20D tullut pöllyä vaikka kuvasin 3 vuotta ja välillä vaihdoin linssejä montakin kertaa päivässä. Loppuaikana oli tosin automaatti tärytys päällä.
04-11-2011, 01:29 PM   #7
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It was a dust. I used a blower several times, and it's gone!
Thanks a lot, everybody!
I can enjoy shooting now ^_^
04-14-2011, 02:18 PM   #8
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Pentax has seemed to resolved this issue, however, it's not something that has completely left my concern. I have a new k-5 with the serial beginning with 402XXXX. Taken a few pics with it here and there, nothing major. Took a few at f11 and looked just at camera screen and found nothing suspicious. Is the sensor stain something you have to LOOK for at small apertures?

04-14-2011, 02:21 PM   #9
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I would also think that a sensor stain would show up pretty obvious in the dust alert check feature.
04-14-2011, 02:39 PM   #10
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Looks more like sensor cancer to me

last K-5 batches are prone to that

you can easily stop it expanding if you put

the camera in the oven at 250C for 1-2''
04-14-2011, 03:27 PM   #11
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QuoteOriginally posted by dreamfoto Quote
Looks more like sensor cancer to me

last K-5 batches are prone to that

you can easily stop it expanding if you put

the camera in the oven at 250C for 1-2''
Yes, death is a foolproof cure for whatever ails you.

But it's not usually recommended as a treatment.
04-14-2011, 09:43 PM   #12
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On hienoa, että on tällainen Edison joka keksi ensimmäisenä tahran K-5. Tämä on pelastanut koko K-5 käyttäjien tulevaisuuden. Tämä nimi täytyy laittaa Pentaxforums historiaan. Kiitos tälle suurelle Pentax miehelle.
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