Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
12-01-2008, 03:18 PM   #1
Veteran Member




Join Date: Aug 2008
Location: London
Photos: Gallery
Posts: 418
noticing my first hot pixels on k20d

over the weekend i noticed a couple of hot pixels cropping up, any chance this is caused by some of the >3 minute exposures i've been doing for the past few days?

Also, i'm happier than i've ever been with the k20d. In a poorly lit venue with the kit lens being barged around with no time to autofocus i can read writing on people's wristwatches and notice imperfections in people's eyelashes from 6 metres away.

12-01-2008, 04:16 PM   #2
Pentaxian
Arpe's Avatar

Join Date: Sep 2006
Location: New Zealand
Photos: Gallery | Albums
Posts: 4,344
Yes. Have you got the latest firmware installed? 1.01(?)
12-01-2008, 07:33 PM   #3
Veteran Member




Join Date: Mar 2007
Location: Boston, PRofMA
Photos: Albums
Posts: 3,053
Even w/ the latest firmware, the K20D is prone to random hot pixels IIRC...
12-02-2008, 12:19 PM   #4
Veteran Member




Join Date: Aug 2008
Location: London
Photos: Gallery
Posts: 418
Original Poster
i have the latest firmware... but is taking long exposures putting my sensor at risk to permanent damage?

12-02-2008, 02:09 PM   #5
Veteran Member




Join Date: Mar 2007
Location: Boston, PRofMA
Photos: Albums
Posts: 3,053
QuoteOriginally posted by IsaacEastgate Quote
is taking long exposures putting my sensor at risk to permanent damage?
No.

For long exposures, cameras take a regular frame and a black frame. The hot pixels typically show up on the same pixels, so they're subtracted from the regular frame. In the K20D, this is not the case unfortunately...the pixels move around. DPR noticed this and Pentax released a fix for 3sec MLU mode, but it doesn't always work for longer durations. That's how I understand it at least...
12-03-2008, 08:40 PM   #6
Veteran Member
rfortson's Avatar

Join Date: Sep 2006
Location: Houston TX
Photos: Gallery
Posts: 2,129
Try the hot pixel mapping feature. It's one of the things about the K20D that every camera should have.
12-04-2008, 12:15 PM   #7
Veteran Member




Join Date: Aug 2008
Location: London
Photos: Gallery
Posts: 418
Original Poster
QuoteOriginally posted by rfortson Quote
Try the hot pixel mapping feature. It's one of the things about the K20D that every camera should have.
i aplogise for being too lazy to get the manual out, but i assume this function looks for hot pixels (and noise?) and subtracts it from each image automatically?

and it won't slow my camera's process times down?
12-04-2008, 12:19 PM   #8
Veteran Member
rfortson's Avatar

Join Date: Sep 2006
Location: Houston TX
Photos: Gallery
Posts: 2,129
QuoteOriginally posted by IsaacEastgate Quote
i aplogise for being too lazy to get the manual out, but i assume this function looks for hot pixels (and noise?) and subtracts it from each image automatically?

and it won't slow my camera's process times down?
You do it once, and the hot pixels are mapped out. If they show up again somewhere else, just do it again. It's a one-time thing, not every shot. It's a very useful feature.

12-15-2008, 07:37 PM   #9
Veteran Member
netuser's Avatar

Join Date: Oct 2008
Location: Azores Islands, Portugal
Photos: Gallery
Posts: 2,241
what is a "hot pixel" ?
12-16-2008, 08:04 AM   #10
Veteran Member
jamonation's Avatar

Join Date: Jun 2008
Location: Toronto
Photos: Gallery
Posts: 364
Take a look at this page for more information about hot & stuck pixels. Hot Pixels

In short, nothing to worry about unless you're seeing thousands of them. Nothing a little spot heal can't fix in post-processing for the most part. When you think about the 10-20 that might be obvious across more than 10 million pixels, we're actually really spoiled.
12-16-2008, 08:07 AM   #11
Veteran Member
netuser's Avatar

Join Date: Oct 2008
Location: Azores Islands, Portugal
Photos: Gallery
Posts: 2,241
Thanks. Already on it.
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, k20d, photography, pixels
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Hot pixels - K7 shininglight Troubleshooting and Beginner Help 1 10-31-2009 08:13 PM
Hot Pixels GregK8 Troubleshooting and Beginner Help 8 03-04-2009 07:17 AM
hot pixels? laissezfaire Pentax DSLR Discussion 14 10-02-2008 07:22 PM
Hot Pixels Issue of the K20D RiceHigh Pentax DSLR Discussion 30 05-09-2008 09:25 PM
hot pixels silverknight Pentax DSLR Discussion 4 03-30-2008 08:48 AM



All times are GMT -7. The time now is 01:36 PM. | 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