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06-23-2012, 07:52 AM   #1
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Intermittent problem: Weird and streaky

Once in awhile, my K5 has started producing images that look like this. I shoot in DNG format. FYI the image looks fine both on the preview screen and on preview prior-to-importing in Lightroom 4. Has anyone else ever seen anything like this? Any thoughts?

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06-23-2012, 08:14 AM   #2
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The preview only shows the embedded low quality JPG and not the RAW so in theory one file can be ok and the other one not. Have you tried another RAW converter to exclude problems with your software?
06-23-2012, 08:49 AM   #3
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I haven't tried another RAW converter, no ... but could that really be the culprit? I shot around 50 images the same day within a period of a couple of hours, and this was the only "bad" image. This is typical: Many, many good images and only one bad one.
06-23-2012, 09:39 AM   #4
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I haven't seen this on my K-5 but I saw it on a friends pocket camera. In his case it turned out to be a problem with the SD card. So have you tried another SD card to see if the problem is still there?

06-23-2012, 12:20 PM   #5
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QuoteOriginally posted by henkemann Quote
I haven't seen this on my K-5 but I saw it on a friends pocket camera. In his case it turned out to be a problem with the SD card. So have you tried another SD card to see if the problem is still there?
+1 for this. It's quick to try another SD card. They are rated for a certain amount of write cycles, so if you've been using yours for quite a while it could be nearing it's end of life. Or you could just have a bad one. Always try the cheapest, easiest fix first!
06-23-2012, 12:30 PM   #6
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Another +1 on that.These wacko images almost always seem to trace back to file corruption. Could be the camera doing the corrupting, but usually just the card or an isolated glitch.
06-23-2012, 01:50 PM   #7
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It *is* an old SD card... I'll replace it, and see what happens. Thanks for this!
07-31-2012, 09:36 AM   #8
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In case anyone else has similar problems and happens to run across this thread at some point in the future: I've done a lot of shooting since replacing the SD card, and this hasn't happened again. So I'm pretty sure at this point that it was a faulty SD card.

08-03-2012, 10:05 AM   #9
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I have the same problem, and mine is NOT related to the SD card.

I have used a reliable card, and it produced the same problem (SanDisk Ultra II). I switched to a brand new, out of the box card (Samsung) and it too had the same problem. I tried another card, also out of the box (Samsung again) and it also fails. These same cards work perfectly on the K10. I also have the problem when shooting PEF.

I contacted Pentax support, who basically told me it wasn't happening. I sent the files to them, and they claimed it was because I used a card reader. I used the transfer cable, and it happened again. Then they claimed it was my OS (Mac), so I developed the DNG in camera to JPG, and it too had the problem. Then they said it was the camera body itself and I should send the body back. I declined to do this.

What I have done to work around this is always shoot DNG+JPG. JPG images NEVER have the problem, so this tells me it is not the card.

I believe this problem started with the latest firmware, but can't prove that.

Hope this helps, and maybe someone else can chime in to get enough attention for Pentax to finally see this as a problem. I ran around for a couple of months with Pentax support before finally giving up.
08-03-2012, 10:55 AM   #10
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QuoteOriginally posted by ifringe Quote
Then they said it was the camera body itself and I should send the body back. I declined to do this.
Why? Sounds like that is the problem, and up until this sentence it sounded like that is what you were trying to convince them (that the camera was broken). So you convinced them, but don't want to get it fixed?
08-03-2012, 12:07 PM   #11
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QuoteOriginally posted by vonBaloney Quote
Why? Sounds like that is the problem, and up until this sentence it sounded like that is what you were trying to convince them (that the camera was broken). So you convinced them, but don't want to get it fixed?
I believe that it is a firmware problem. And since I depend on this camera, I am none too keen to send it away for a while for a problem I do not think will be fixed. I'll reach a slow time soon, and by then, hopefully, there is new firmware or I have enough down time to send it away. I gave up on support because I was just getting standard, canned responses, and didn't feel they were even responding to my specific issue.

Lest anyone not think I like Pentax, I've been shooting nothing except Pentax since 1984, and will continue to do so for as long as I can.
08-03-2012, 03:29 PM   #12
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QuoteOriginally posted by ifringe Quote
I believe that it is a firmware problem.
If it was a firmware issue, wouldn't we all have the same problem? I'm assuming you're using the latest firmware?
08-03-2012, 05:22 PM   #13
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QuoteOriginally posted by vonBaloney Quote
So you convinced them, but don't want to get it fixed?
Pentax was not convinced, because the camera was not sent it in to get fixed. Pentax will not register this as a problem.
08-03-2012, 05:42 PM   #14
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QuoteOriginally posted by SpecialK Quote
Pentax was not convinced, because the camera was not sent it in to get fixed. Pentax will not register this as a problem.
They asked for the body back to fix it, and he wouldn't send it. They were as convinced as they could be without actually seeing it.
08-04-2012, 05:54 AM   #15
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Sorry for stirring this all up.

Perhaps a better way to have said this was: it is, at this time, not practical for me to send this body in. I depend on the K5. I have a workaround (JPG) and taking critical shots twice. At some time, in the future, I will send it in, when it is not as a critical time. Perhaps, between now and then, the problem will be fixed in firmware or my sales will be higher than expected and Pentax will release a new camera, or I will purchase another K5, freeing this one up. At the moment, it is monsoon season in the American west, a beautiful time for photography, but not a beautiful time to be without a K5, and since the K5 drives my income, sending it in for something which is annoying, yet minor, is not a great idea.

In the meantime, Pentax support gave me the runaround, so I did not have any confidence that it is the body, and felt that they were simply giving me canned answers.

My image failure rate is about 1 in 100 images.

Hope that clears up my reasons. I chimed in on this thread in case others were experiencing the problem as well.
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