Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-10-2008, 03:18 PM   #1
New Member




Join Date: Dec 2008
Location: Los Angeles
Photos: Gallery
Posts: 6
Pentax *ist Digital CCD Bleeding Problems?

I have a *ist 6MP DSLR which I've used for the past 3 years without any problems. Recently, the following problem appeared. It doesn't happen on every shot, but I'd say 50 - 60% of the time. Anybody know the cause or have similar problems. If so how much would it cost to fix, since it's out of warranty?




Last edited by sbs; 12-12-2008 at 08:12 AM.
12-10-2008, 04:12 PM   #2
Veteran Member
rfortson's Avatar

Join Date: Sep 2006
Location: Houston TX
Photos: Gallery
Posts: 2,129
Ouch! That looks like a sensor problem to me, but you could try a different card. Doubt that will make a difference, though.

No clue on the repair cost, but with the K20D going for $699 online, I'd be tempted to put that repair money towards a new body. You'll get more resolution, more features, and shake reduction. Even if you found a used K100D, you'd probably be ahead of the game.
12-11-2008, 10:07 PM   #3
Pentaxian
RobA_Oz's Avatar

Join Date: Nov 2008
Location: Tasmania, Australia
Photos: Gallery
Posts: 4,334
Is it a sensor problem or is it the post-capture processing, or is it a file transfer problem?

If it's the second or third possibility, and I'd be inclined to consider those before the sensor in this case, then you may have a problem that's soluble more simply and cheaply than a sensor replacement.

If the problem is in the post-capture processing, then without knowing whether the image processing is done in hardware or in firmware, I couldn't say whether a circuit replacement or a simple re-installation of the firmware will fix it.

Have you installed the latest version of the camera's firmware recently (or at all)?

The fact that the problem doesn't happen on every shot is intriguing, though. Failure to transfer completely caused a similar (but not identical) problem on a Digital Ixus I once had. Do you take the card out to download your pictures via a card reader or do you use the cable? Either way, a dodgy connection might create havoc. Does the problem appear on preview in the camera, or only on transfer to the computer? If the latter, then I'd suspect the transfer process, and start using whichever method you don't use at the moment.

Perhaps someone more knowledgeable might enlighten us on the firmware issue?
12-12-2008, 08:07 AM   #4
sbs
New Member




Join Date: Dec 2008
Location: Los Angeles
Photos: Gallery
Posts: 6
Original Poster
The anomaly can be clearly seen on the camera's LCD display, so it's not a transfer problem. I've also tried using a different memory card but I still have the same issue, so I don't think it's that either.

I haven't updated the firmware recently, perhaps I did it years ago when I first bought the camera. But the fact that the problem just appeared out of nowhere 2 weeks ago makes me think it's probably not a firmware issue.

The problem seems to manifest itself more often when I use the lower ISO range of 200-800. If I use 1600 or 3200, it happens less often. Further, the bleeding seems to cluster around areas of highlights.

Here you can see another example:



12-12-2008, 08:09 AM   #5
Veteran Member
Gooshin's Avatar

Join Date: Sep 2007
Location: Toronto, the one in Canada.
Posts: 5,611
what if you shoot raw and use a third party program to convert it?
12-12-2008, 08:11 AM   #6
Site Supporter
forensicscientist's Avatar

Join Date: Jun 2008
Location: DFW Texas and Maine - I commute :)
Posts: 889
Sorry to say, but it does look like a sensor issue to me. Although not identical, I had similar issues with an old Fuji years ago.

mark
12-12-2008, 10:03 AM   #7
Veteran Member
jeffkrol's Avatar

Join Date: Sep 2006
Location: Wisconsin USA
Photos: Gallery
Posts: 8,435
QuoteOriginally posted by sbs Quote
The anomaly can be clearly seen on the camera's LCD display, so it's not a transfer problem. I've also tried using a different memory card but I still have the same issue, so I don't think it's that either.

I haven't updated the firmware recently, perhaps I did it years ago when I first bought the camera. But the fact that the problem just appeared out of nowhere 2 weeks ago makes me think it's probably not a firmware issue.

The problem seems to manifest itself more often when I use the lower ISO range of 200-800. If I use 1600 or 3200, it happens less often. Further, the bleeding seems to cluster around areas of highlights.

Here you can see another example:

Looks a lot like the Sony sensor problems from the P&S 's . Never heard of it in APS-c though.
Send it in w/ a picture and tell Pentax you felt it was a hidden defect in the camera. This may inspire them to honor an "extended" warranty.
Widespread CCD problems in consumer imaging products
http://www.imaging-resource.com/NEWS/1129055750.html
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
*ist, camera, dslr, pentax *ist, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax Digital Utilty 4 Problems seachunk2 Digital Processing, Software, and Printing 6 02-21-2010 06:33 PM
Pentax Digital Camera Utility 4 Install Problems MacPentax Digital Processing, Software, and Printing 4 09-26-2009 10:56 PM
*ist D underexposure problems Stevopedia Pentax DSLR Discussion 9 02-26-2009 07:22 PM
ist-d problems apathey2131978 Pentax DSLR Discussion 1 09-08-2008 07:10 AM
*ist DS known problems jdmidwest Pentax DSLR Discussion 21 05-12-2007 09:04 AM



All times are GMT -7. The time now is 03:49 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top