Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-17-2006, 05:02 PM   #1
Forum Member




Join Date: Dec 2006
Photos: Gallery
Posts: 64
Hot pixels, pixel mapping, and the Pentax Warranty?

Yeah I have a hot pixel. Yeah I know that I could live with it and deal with it myself in photoshop or what not. It is noticeable to me at handheld shutter speeds and mid-ISO on the shots I've taken recently...

So I was wondering if it is possible to get this mapped out in the camera some how, if it's end user serviceable, and if it is not, if it's possible to get Pentax to do it under warranty service.

I saw a forum post that said that in some countries Pentax service does do software mapping while in Pentax UK specifically they actually change out the sensor.

What's the solution in the US?

12-17-2006, 06:38 PM   #2
Veteran Member
joele's Avatar

Join Date: Sep 2006
Location: Melbourne, Australia
Photos: Gallery
Posts: 1,309
I don't think it is user fixable, but I had a dozen or so at ISO 200 on my ist DS and I took it back to the Pentax service center and they mapped it out for me under warranty.. They kept my camera for a couple of days, I think I took it in on a Monday and got it express posted out to me on the Thursday...
12-17-2006, 09:08 PM   #3
Senior Member
Flaco's Avatar

Join Date: Nov 2006
Location: Outside Chicago
Posts: 218
I'm going to sound like a newb, which I am to the dslr world. But what exactly is hot pixels/pixel mapping?
12-17-2006, 09:15 PM   #4
Veteran Member
joele's Avatar

Join Date: Sep 2006
Location: Melbourne, Australia
Photos: Gallery
Posts: 1,309
I actually had stuck pixels which are pixels that show as constant red (or blue) dots.. so I could take a picture of white wall and had little red dots...

Hot pixels do a similar thing but tend to only happen under longer exposures and higher ISOs... Whereas stuck pixels occur no matter the length of the exposure or ISO..

Pixel mapping means they tell the processor in the camera to dump (ignore) these few pixels (out of the 6 million it means very little to dump a few)..

12-17-2006, 09:22 PM   #5
Veteran Member




Join Date: Dec 2006
Location: UK
Posts: 643
its a shame they dont make it user fixable.. some think duff pixels are normal but i dont on a new camera.. my son took two back for exchange till he found a sample that didnt have the problem..

trog
12-17-2006, 09:24 PM   #6
mcm
New Member




Join Date: Dec 2006
Location: Pollock Pines, CA
Posts: 12
Question: What test can you do to determine this.

Doesn't seem like an easy thing to spot if you had say, less than 10 bad pixels total.

If you had several thousand well sure.. maybe that would be more noticeable.
12-17-2006, 09:36 PM   #7
Veteran Member
joele's Avatar

Join Date: Sep 2006
Location: Melbourne, Australia
Photos: Gallery
Posts: 1,309
Put the cap on your lens and set to manual and 1/30 and whatever apeture, now take a shot, should be black (no stars)... lower ISOs should be none, ISO 1600 it is possible we all have some..

If you don't notice them in pics (I did as I had a cluster) it is better not to know they are there, as once you notice them you can't forget..
12-17-2006, 09:53 PM   #8
Veteran Member




Join Date: Dec 2006
Location: UK
Posts: 643
they show up worse at slow shutter speeds 1/30 is way to fast a test.. low light shutter speeds of around 1/15 of a second against darkish background will bring them out..

and it only take one pink dot against a darkish background and once u know its there it sticks out like a saw thumb and irritates u each time u see it.. he he

but if u cant see any u dont have a problem.. i have never noticed any on my camera but then again i aint gone looking for em..

trog

12-17-2006, 10:02 PM   #9
Veteran Member
joele's Avatar

Join Date: Sep 2006
Location: Melbourne, Australia
Photos: Gallery
Posts: 1,309
But to show stuck (not hot) pixels they still show up at ISO 200 and 1/30 (mine did anyway, thats why they fixed it under warranty)..

Last edited by joele; 12-17-2006 at 10:33 PM.
12-17-2006, 10:08 PM   #10
Site Supporter
slip's Avatar

Join Date: Oct 2006
Location: 2 hours north of toronto ontario canada
Photos: Gallery | Albums
Posts: 3,515
QuoteOriginally posted by trog100 Quote
its a shame they dont make it user fixable.. some think duff pixels are normal but i dont on a new camera.. my son took two back for exchange till he found a sample that didnt have the problem..

trog

weird thing is... my wife's old 3mp olympus stylus 300 has pixel remaping.
she never had a problem in the years she owned it with hot pixels, so I have no idea how well it works, if at all.

randy
12-17-2006, 10:35 PM   #11
Veteran Member
joele's Avatar

Join Date: Sep 2006
Location: Melbourne, Australia
Photos: Gallery
Posts: 1,309
Yes pixel mapping is on the top of my firmware update wish list ;-)
12-18-2006, 12:12 AM   #12
Forum Member




Join Date: Dec 2006
Photos: Gallery
Posts: 64
Original Poster
12 hot pixels is pretty bad! Right now, I have just one pixel that shows up at handheld speed...and I think it's the only one. Pretty annoying, though. Does Pentax set a threshold for number of hot pixels before they do anything with it?
12-18-2006, 06:51 AM   #13
Veteran Member




Join Date: Dec 2006
Location: UK
Posts: 643
i think they fix them under warrantee.. what puzzles me is why so many 100ds seem to have them.. i have seen them in a few review nightshots.. my sons second k100 was worse than his first.. he then spent an hour in the shop testing out the third one before accepting it..

he has an olympus E20 which has user available pixel mapping.. either pentax need to start shipping cameras with less of them in the first place or biuild something in the firmware so that people can get rid of them their selves..

he did ask the pentax people about pixel mapping but didnt get much of an answer.. but they do fix them under warrantee and accept they shouldnt be there..

my camera has a much later production run number than any of the three my son has had.. it might be an early run thing and they might have improved things i dont know.. this one comes down to how long the camers have sat on the shop shelves probably..

trog
12-18-2006, 08:00 AM   #14
Senior Member
superfuzzy's Avatar

Join Date: Dec 2006
Location: NJ, USA (close to NYC)
Photos: Gallery | Albums
Posts: 278
I should have my k100d in a day or so, and will do the test.

I never thought I'd be taking photos with the lens cap ON
12-18-2006, 11:10 AM   #15
Veteran Member




Join Date: Dec 2006
Location: UK
Posts: 643
"I never thought I'd be taking photos with the lens cap ON"

dont worry too much about it.. its just a beginning.. hours of similar pointless pixel peeping will inevitably follow.. its just part of the game..

trog
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!
camera, dslr, pentax, photography, pixel, service
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pixel mapping on K10D coa75 Pentax DSLR Discussion 6 04-04-2011 11:48 PM
Pentax k-x: Dead Pixels? Pixel Mapping? flomat Troubleshooting and Beginner Help 3 03-23-2011 04:12 PM
DCU Hot Pixel Mapping trailrider Digital Processing, Software, and Printing 5 03-01-2011 07:19 AM
Mapping hot pixels in a P&S ghl Pentax Compact Cameras 4 12-15-2010 05:06 PM
Just out of curiosity, what happens during pixel mapping? Ian G Pentax DSLR Discussion 3 08-18-2010 02:18 PM



All times are GMT -7. The time now is 08:06 AM. | See also: NikonForums.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