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10/08/2006 11:51:47 PM · #1 |
Anyone else with the 5D noticing hot pixels in their photos? I was reading over DPreview that this has been a long standing issue with these cameras especially on long exposures.
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10/09/2006 12:09:33 AM · #2 |
| Isn't it a long standing issue with all cameras on long exposures? |
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10/09/2006 12:10:58 AM · #3 |
I never noticed them on my XT at all.
Message edited by author 2006-10-09 00:12:43.
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10/09/2006 12:12:12 AM · #4 |
| I've got three or four hot pixels on my rig...usually, like you said, at long exposures. I've never had a problem with them on my 20D, so no, I'd say it isn't necessarily a problem with all cameras. |
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10/09/2006 12:16:24 AM · #5 |
I wonder if that long exposure noise reduction custom function enhances them?
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10/09/2006 12:17:26 AM · #6 |
Originally posted by NstiG8tr:
I wonder if that long exposure noise reduction custom function enhances them? |
it does seem to intesify them a bit on mine, but they are still there regardless of whether NR is on or not. |
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10/09/2006 12:18:10 AM · #7 |
| Try sticking the camera on 'sensor clean'. It'll pause for a second before bringing up the mirror and it's been speculated that this helps re-map hot pixels. Just switch the camera back off when it's done. It worked for a hot pixel on my 5D. For long exposures I think thats another story all together, but the Cfn for 'long exposure noise reduction' might help you out. |
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10/09/2006 12:25:25 AM · #8 |
Originally posted by bfox2:
Try sticking the camera on 'sensor clean'. It'll pause for a second before bringing up the mirror and it's been speculated that this helps re-map hot pixels. |
I read that at DPreview. There is a lot of speculation as to whether this works or not. Some say it does, others say not. Canon says there is no validity to this. I'm gonna try it anyway. Some also say stay away from DPP to convert RAW as this software makes them worse.
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10/09/2006 10:00:58 AM · #9 |
It would certainly depend on the manner of problem with the pixel itself.
There are a few different reasons that a pixel can be giving a faulty readout.
One of them could be a physical misalignment. Another could be a sensitivity error. Yet another could be a dead pixel with a 0 value or conversely an ever present full value.
Not all of these return the same types of errors and not all would be fixable by a remap. This would also account for discrepancies in the results of the DPReview crew...
A sensor remap such as is speculated with the 5D and 30D would only affect the types of pixels that are consistently returning faulty values. If there is a sensitivity error (which commonly shows up in long exposures, but would go unnoticed in shorter exposures), it's highly likely that a brief 1 second sensor remap would totally miss it. Further, a sensitivity error would not show up consistently, so short of actually remapping it on each exposure....
I've personally seen a few examples of successful remaps on 5Ds and 30Ds so I'm inclined to believe that this really is in the camera. At least until I get a hot pixel myself that is... :)
It's worth a try, but based on your description of things, it's possible that this isn't going to be fixed by a sensor remap.
Long exposure noise reduction should do a pretty good job though.
I wish I could tell you more about DPP vs other software, but I've not come across this issue myself. DPP works fine for me.
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10/09/2006 10:02:35 AM · #10 |
Originally posted by NstiG8tr:
Anyone else with the 5D noticing hot pixels in their photos? I was reading over DPreview that this has been a long standing issue with these cameras especially on long exposures. |
havent read the responses yet but in a word YES! my 5d has a hot pixel. thats for sure. |
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10/09/2006 10:13:22 AM · #11 |
I've seen hot pixels before (on other cameras), but so far on my 5D and two 20Ds I haven't found any hot pixels. I do have the long exposure noise reduction setting turned on for all three cameras...
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10/09/2006 11:51:20 AM · #12 |
I don't think mine has any hot pixels. If it has I haven't noticed them, so no I don't have a problem.
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