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01-07-2011, 10:51 PM   #1
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Dust or stain?

Just got my 3rd K-5 from BH today, took some test shots with 2 diff lenses. this is not as bad as the others and may just be dust. SN# 398xxxx

Thoughts?

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01-07-2011, 11:18 PM   #2
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Have the same stain/dust and it starts with f/16 and all the way up.
I sent my K5 back to Amazon tomorrow.
01-07-2011, 11:21 PM   #3
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It's just an ordinary mole - nothing to worry about.
01-08-2011, 12:36 AM   #4
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Unless it has a concentric ring shape to it its just dust and not the stain. Could easily be introduced by the first time you put a lens on.

01-08-2011, 02:43 AM   #5
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Eikö pöly näy aina pölyhälyytys kuvissa ja tahra ei?
01-08-2011, 06:22 AM   #6
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Looks definitely stain to me. Can we see same spot at F8 or 5.6?
01-08-2011, 10:08 AM   #7
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shots at 5.6, 8.0, 16 and 22

I used my rocket blower on the sensor to remove any possible dust and also the dust removal feature on the cam. no effect. Looks like a stain to me. it's a shame that is my 3rd cam with the issue.

The spot is in the lower right frame.
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01-08-2011, 11:32 AM   #8
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this does not at all look like the K-5 stain, there is NO concentric circle pattern inside it. Plus there is only one of them, the stain issue is a string of concentrically ringed and more in focus objects...

01-08-2011, 11:42 AM   #9
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Well, even if it isn't a "stain" per say it's still a quality control issue with the sensor - this shouldn't be here with a brand new cam and it isn't just "dust", it's too profound.

I find highly doubtful i introduced this with a couple seconds of exposure to the air when i put the lens on to test and it not being removed after using my rocket blower.
01-08-2011, 12:22 PM   #10
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QuoteOriginally posted by Mortox Quote
Well, even if it isn't a "stain" per say it's still a quality control issue with the sensor
I think you are correct. Your stain looks pretty much the same as the stains shown in Falk's thread, and using the information therein, you can do the math yourself.
01-08-2011, 12:45 PM   #11
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Myself I think it’s easier to judge stains if manually set to closest focus. The “stain” gets sort of sharper then, and the distinct character of a stain shows up better. Also set ISO to 100. It doesn’t matter if shutter time is several seconds.
01-08-2011, 02:32 PM   #12
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Set your ISO to 80 or 100, put it on a tripod and shoot the f/22 photos again. You're using a very high ISO for test shots and the noise/graininess is making it very hard to make out any detail in the spot, so we can't tell what it really looks like.
01-09-2011, 10:46 AM   #13
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i'm not going to waste any more time. it obviously shouldn't be there so i am sending it back. i was hoping for 3rd times the charm.

Highly disappointed with Pentax. You can make a great cam with a great sensor but please don't provide it to consumers with quality control issues.
01-09-2011, 11:11 AM   #14
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Looks like dust

Every DSLR under the sun has dust on its sensor at f22.
I have even had a Nikon D300s with dust in the viewfinder!
Don't sweat fella, within a couple of days any DSLR will show dust at f22.
01-10-2011, 12:18 AM   #15
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QuoteOriginally posted by Mortox Quote
i'm not going to waste any more time. it obviously shouldn't be there so i am sending it back. i was hoping for 3rd times the charm.

Highly disappointed with Pentax. You can make a great cam with a great sensor but please don't provide it to consumers with quality control issues.
And the 4th camera you get will also have dust on it. Just like the 3rd camera.
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