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10-28-2011, 07:54 PM   #1
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Several Bad Pixels

My older ist DS has several bad pixels. I took it to the camera shop and they told me that there was nothing I could do about it and that most digital cameras start having bad pixels after about five years, who knew? I love this camera and would like to have it whole again.

I'm thinking about sending it to Pentax Service to see about having the CCD repaired but wanted to ask here first if that makes sense and if anyone has done this before. If so what kind of cost would I be looking at?

Thanks for any information!

10-28-2011, 08:06 PM   #2
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Sentimental attachment aside, it won't make sense to have a sensor replaced in a camera that old. You would likely be looking at repair costs well in excess of the price of a replacement.

It doesn't look like your camera has the pixel mapping function that newer models do, so that's out (it detects dead pixels and compensates for them). About all you can do is start looking for a new camera, or get used to using the clone stamp in Photoshop or a similar application.

Considering the *ist DS was introduced in 2004, it's had a pretty good run.
10-28-2011, 09:15 PM   #3
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Shot some raw and see if they are removed by raw converters. If they disappear, then live with it. My Ds had a dozen hot pixels when new. Pentax Japan replaced the CCD and motherboard only ended up with the same amount of hotpixel, plus more banding. My K-m has hot pixels too. I don't know whether it was due to 2nd grade sensor being sourced by Pentax or just pure luck, but if the raw converters can remove them automatically, I see no reason to have it repaired which might do more harm than good.
10-28-2011, 11:31 PM   #4
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QuoteOriginally posted by wlachan Quote
Shot some raw and see if they are removed by raw converters. If they disappear, then live with it. My Ds had a dozen hot pixels when new. Pentax Japan replaced the CCD and motherboard only ended up with the same amount of hotpixel, plus more banding. My K-m has hot pixels too. I don't know whether it was due to 2nd grade sensor being sourced by Pentax or just pure luck, but if the raw converters can remove them automatically, I see no reason to have it repaired which might do more harm than good.
My K-7 is scarcely a year and a half old, and it has all sorts of hot pixels that show up in long exposures. As wlachan says though, RAW editors will automatically remove these pretty reliably, so that may be all you need. I worried about what I was seeing on my LCD until I opened the files in Adobe Camera RAW and the problems went away.

10-29-2011, 04:57 PM   #5
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Adobe Camera RAW will remove them automatically from RAW images. Elements, Photoshop or Lightroom all use that function of ACR, even Elements versions as old as 4 will work with DS files. (I did not know this for about a year and assumed my DS was hot-pixel-free.) The DS was not that great at JPG processing anyway, so RAW is the way to go.
10-29-2011, 07:49 PM   #6
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Unfortunately, bad pixels seem to be inevitable with digital cameras, but they can usually be fixed easily in software. Even with a new camera, some number of bad pixels are considered normal. Some newer cameras have firmware that can map out the bad pixels, but yours doesn't. Your camera is probably past the point where professional repair would be cost effective.

Paul
11-04-2011, 01:56 PM   #7
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I'm not feeling so bad about my ist-ds having 2 now after hearing this. Of course it was new old stock so it only has 3 years use. Is it even noticable? I'm not sure if mine had them all the time, but I didn't notice any for a couple of years and then only noticed them when pixel peeping to check out a particular new lens (then tried another lens to make sure it was the camera). It doesn't even show on prints.
11-04-2011, 02:16 PM   #8
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My *istD has several that have developed over time. I shoot jpeg so raw converters don't help me I just ignore them. I can fix them easily enough if I need to

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