RiceHigh's Pentax Blog: Sensor Stains, Pentax' Fault? (Coz K-7 is Also the Same!)

Tuesday, September 06, 2011

Sensor Stains, Pentax' Fault? (Coz K-7 is Also the Same!)

See what Peter Zheng has lately found and reported:-

http://tech.groups.yahoo.com/group/ricehigh_pentax/message/937

Reports from K-7 users about sensor stains with photos clearly showing those are posted. And yes, the symptom is exactly the same as the previous K-5's.So, it is almost safe to conclude that it's Pentax' AA filter that causes the problem!

(Source Thread: http://bbs.kakaku.com/bbs/K0000036023/SortID=9944776/#9953651)

After all, the AA filter simply would change in state over time and it is generally guessed that the larger amount of heat from the sensor unit melts the AA filter and thus causing the visible stains. That could explain why the less-hot Pentax models like K-r, K-x and K-m have never had that problem reported. But, at the end of the day, the BIG question is that: Will the next Pentax Flagship have the same persistent problem? Or, will Pentax simply NOT install any AA filter like what they have already done to the Q? That would be the safest "solution" to the issue? Right? ;-)

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Raist3d · 706 weeks ago

Wow. Talk about jumping to (most likely wrong) conclusions! Seriously Rice, think this through! Couldn't it simply be that *some* K-7's had the issue and not the whole overheating thing? Considering the materials, I don't think it's that easy to conclude that the AA filter will burn exactly in those spots in the middle like that!

From your original link to these news, there's nothing suggesting this is happening over time. In fact, the quote had to do more to the fact the K-7 had that problem at some point, not now.

14 replies · active 706 weeks ago

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RiceHigh 110p · 706 weeks ago

Of course the true technical reason behind this issue of Pentax DSLR sensor stains will not be known as Pentax has never told us anything about it.

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Raist3d · 706 weeks ago

No, but you can stop making things up. What you said is not only made up but highly unlikely. Use your brain. It's far more likely that it is a manufacturing problem. Of course, you ignored the point that it doesn't look like K-7's with age are having this problem after the fact, as I pointed out in the link you quoted.

See what I mean? You don't look objective when doing this, you look like you want a sensationalist headline. If you mean well, please think this through.

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Raist3d · 706 weeks ago

Oh and for the record, it was GOOD that Pentax came forward on the K-5 and admitted it. I wish more companies did that. Of course, I am not trying to say that Pentax's record is clean, but it's better than at least another I know.

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RiceHigh 110p · 706 weeks ago

Pentax only said that there is such a problem after excessive complaints from new K-5 users. But the key point is that, unlike Canon, they do not have a clear technical explanation on the problem and no ordinary Pentax user knew exactly the root cause of it (and thus if Pentax has cured it or not).

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Raist3d · 706 weeks ago

Yes, just like Canon admitted issues with the EOS Mark III only after excessive user complaints. But my point is, that is still better than a company admitting nothing, which yes, it has happened.

That Pentax doesn't have a clear explanation doesn't make much sense given what you posted- first because you decided to make something up- completely- in the name of what seems apparent now to be just being sensationalistic- not truthful- but tabloid sensationalistic.

If you really mean to help at least you could have stuck up front to the point that they have not explained it - as you say. Though they did say it was a manufacturing problem- which quite frankly given the limited runs it happened on, and what I know about manufacture and engineering, seems quite reasonable. Whether on Sony's side or Pentax side both are possible. It's not like Sony hasn't had problems with sensors on their own before (remember all those P&S sensors that were dying from different brand not so long ago? That was all Sony).

But instead of considering those very valid possibilities you opted for making shit up. "Oh yeah, maybe they age and die over time, over heat. That's why the others didn't have it". That's complete made up bull shit.

Again, if you mean well, think this through.

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Rasit3d · 706 weeks ago

Just like Canon only admitted about the MKIII problem after excessive complaints from MKIII users. Yes, that's not ideal, but it's stil much better than not saying anything, which I know has happened to.

Pentax said it was a manufacturing issue. Instead of going with a most likely explanation you decided to make things up! It could be on Sony's or Pentax's side. After all, it's not like Sony hasn't had issues before with their sensors (remember the relatively recent P&S sensor recall they did as sensors were dying).

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Raist3d · 706 weeks ago

Oh and I missed another point- if Pentax "cured it or not"- that's not true- Pentax did say they took care of this issue. Which makes sense if it's a manufacturing issue. Recent K-5's don't have the stains.

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RiceHigh 110p · 706 weeks ago

Pentax only said that the problem would be covered by the warranty, which is just an useless statement after all. They should bear the warranty responsibility no matter what and how, for these factory and manufacturing/design issues.

The issue may have been cured, or not, as Pentax has never told us something, unlike Canon, they published a paper on explaining the technical cause of the issue and how they would cure it.

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AlexS · 706 weeks ago

Again, you're making things up.
Pentax said: "All users of these defective products will receive free repair at our service center." - and I'm *quoting* them.
Canon didn't do any better, FYI - I bet that paper is on a different subject, or it doesn't exist at all.

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Raist3d · 706 weeks ago

I don't understand why you decide to continue making things up that are so easy to verify. Do you realize how this puts your credibility with readers at near zero pretty fast? This is not being truthful which I appreciate but making things up due to some personal agenda.

Here's Pentax full statement where they apologized, mentioned they believe is due to a manufacturing problem, mention that it is only the first shipment of K-5's and mention they will repair any camera with this issue- not just by warranty coverage.
http://www.pentax.jp/english/news/announce/201101...

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RiceHigh 110p · 706 weeks ago

>> Use your brain

Please do not use similar offensive words for our discussions, it won't help anything and this is not welcome, certainly.

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Raist3d · 706 weeks ago

I am pointing out that apparently you are opting for not thinking things through and makings things up. Obviously that doesn't help either.

And don't get me wrong, my point is not to cover it all in rose colored glasses. I welcome objective critique. That means the good and the bad. Not made up sensationalist interpretations.

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RiceHigh 110p · 706 weeks ago

Your sensational statements and stance is not anything better than mine.

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Raist3d · 706 weeks ago

Not really because I am calling it as I see it and I am pointing out why (see above about you making up false statements again on this issue). You are making things up with zero evidence. I am pointing out that by doing that, you are not really thinking and strongly suggest you have some sort of personal agenda.

I back up what I am saying, you don't.

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Tuesday, September 06, 2011

Sensor Stains, Pentax' Fault? (Coz K-7 is Also the Same!)

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