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View Poll Results: Is your K5d sensor stained?
YES - There are stains on my sensor 19356.43%
NO - My sensor has no stains 14943.57%
Voters: 342. You may not vote on this poll

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12-07-2010, 10:20 AM   #166
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QuoteOriginally posted by goubejp Quote
Well I think it's not; it does no look like the typical pattern of stain; only a dust particle
Any way to get rid of it, it does show up just as one of these stains would so I would have to say if I am not able to get rid of it, isn't it just as bad, maybe only a little better?

12-07-2010, 10:23 AM   #167
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QuoteOriginally posted by geezer52 Quote
Sadly I must revise my original assessment. Initially everyone seemed to have the "trail of dots" near the middle of the image. But after following the thread and seeing all the variations, I did a more thorough exam and found the dreaded spots in the upper left corner of my images. Quite evident at f22 and smaller but knowing now where to look I can detect it in some shots as wide as f11. I tried two different lenses, the Sigma 10-20 and for whatever reasons the spots were more pronounced than with my DA40. Not super major but I kinda feel like when my new car, less than week old got it's first big scratch from some bozo in a parking lot.

Serial # 3890099
I really don't think that that is anything other than normal dirt spots that can easily be cleaned with a blower or a sensor swab.
12-07-2010, 10:39 AM   #168
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QuoteOriginally posted by PixleFish Quote
Keep in mind when looking at the poll, that this forum as a number of trolls that would love to click 'yes' and make this camera look crappy.
QuoteOriginally posted by janneman Quote
Or fanboys pushing the "no"- button....
I'm sure that the trolls and fanboys who would do that probably cancel each other out.

My personal estimate is that the results of this poll are probably accurate within 10%.

Some seem to believe most of us are so inept that we can't tell the difference between normal dust and strings or clusters of cell like deposits on the sensor assembly. Sorry but I don't buy that...

Pat
12-07-2010, 10:55 AM   #169
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OK, I have to change my original vote (post #33) from no to yes. I just took another shot and sure enough, there they are! What I don't understand is why they only show up sometimes???

FWIW, to rule out dust on/in the lens, here are two shots, with two different lenses.

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PENTAX K-5  Photo 
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PENTAX K-5  Photo 

Last edited by Tom S.; 12-07-2010 at 11:41 AM.
12-07-2010, 11:00 AM   #170
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QuoteOriginally posted by ve2vfd Quote
I'm sure that the trolls and fanboys who would do that probably cancel each other out.

My personal estimate is that the results of this poll are probably accurate within 10%.

Pat
Niot sure if they cancel each other out and accurate within 10% , I dont know.
The serial number database showed 8 out of 44.

However bad Pentax QC might be, or seem to be, or the sensor assemblor's for that matter, a 50% chance of any fault of this magnitude would have been noticed.
12-07-2010, 11:11 AM   #171
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QuoteOriginally posted by Wheatfield Quote
My bad, I had thought this thread was about the K5.
The K5 is not a premium product, it is priced in line with competitors products of similar function, and while it appears to have a QC issue with a major component from an outside manufacturer, if the QC was "horrible", I suspect that the cameras would be arriving DOA.

Consider yourself lucky you didn't choose a real premium product such as the Canon 1D MarkIII or 1Ds Mark 3. Youd have a $6500.00 for a camera that splashes lube onto the sensor.
I'm sure that would make you positively apoplectic.
My understanding of "premium" in case of K5 is D300s and 7D level... If Pentax wants to play on the same field with big boys feature and price-wise, it's better put their pants on and get the sh#t together.

Although my 18-135 is not in yet, the body is... so I'll go pick it up Tonight... if it will pass the white wall test of course... But knowing my luck with Pentax lately, i don't expect any miracles...
12-07-2010, 11:22 AM   #172
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QuoteOriginally posted by ogl Quote
These ring-shaped spots are the images of oil lubricant on the surface of the low pass filter (LPF), which is located in front of the CMOS sensor.
ogl,

please don't do analogy deductions. From all we know, we see complex shadow images from simple particles. We even have a Raynox image of one. The particles could be dried remainings of a liquid. But now they seem to be particles.

Oil could look differently, possibly actually brighter due to a focussing effect. Like in the Canon image. The shadow image of an oil drop probably would not look like an oil drop. It probably would exhibit Newtonian rings too with a close enough f-stop.

Eventually, it is hard to believe oil drops could make it into the middle of a 1/5 mm narrow gap between chip and AA filter.


So, Canon has a problem, and Pentax has theirs which is different. Fair enough.
12-07-2010, 11:44 AM   #173
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anybody tried good wet clean ?

12-07-2010, 11:50 AM   #174
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QuoteOriginally posted by Vaikis_ Quote
anybody tried good wet clean ?
Yup, twice and it did not change a thing. (and some in this thread had it done professionally to no avail)

Pat
12-07-2010, 11:52 AM   #175
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Does anyone have real world photos affected by the "String of Pearls"?
Not test shots. Real photos. Of real things.

I've started a thread for them, please post here:
https://www.pentaxforums.com/forums/pentax-k-5-forum/125130-real-photos-not-t...ls-stains.html

Thank you.
12-07-2010, 11:54 AM   #176
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Those of you with the oil stains, do they show up during a "dust alert" test? Just curious...

Or is the dust alert test just for much larger particles?
12-07-2010, 11:57 AM   #177
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After a lengthy wait picked up my K 5 last Friday. Tested it over the weekend and found out I am one of the unlucky owners of a stained sensor.
Only one spot on the sensor, but a rather big one.
S/N 3885503 purchased in Helsinki.

Contacted Pentax´s service center straight away. They told they have not yet received instructions from Pentax how to deal with these cases.
Half an hour later they promised to replace my camera with a new one.

I have very mixed feelings, dont really know whether this is tragic or comic. Pentax introduces a highly competitive new model, and ends up with a mess like this !

However, I think what this service center did is exactly the way to deal with incidents like this. If shit really hits the fan, attemps to cover it up only maximise the damage. Just do what it takes to get it right without delay ,and you have a reasonable chance of retaining customer loyalty !
12-07-2010, 12:01 PM   #178
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QuoteOriginally posted by Trig Quote
Those of you with the oil stains, do they show up during a "dust alert" test? Just curious...

Or is the dust alert test just for much larger particles?
Strange enough dust alert does not seem to notice anything. Not in my case anyway...
12-07-2010, 12:12 PM   #179
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Dust alert is recognizing only the more prominent dust spots.
And it uses only f16 for detection.
My spot is at the detection margin. Sometimes dust alert is seeing it, sometimes not.
12-07-2010, 12:37 PM   #180
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QuoteOriginally posted by PePe Quote
Strange enough dust alert does not seem to notice anything. Not in my case anyway...
QuoteOriginally posted by blende8 Quote
Dust alert is recognizing only the more prominent dust spots.
And it uses only f16 for detection.
My spot is at the detection margin. Sometimes dust alert is seeing it, sometimes not.
Thanks for the answers guys.
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