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Author Topic: 5dIII hot pixel question  (Read 5294 times)

HoneyBadger

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5dIII hot pixel question
« on: July 28, 2012, 02:06:41 AM »
Hi all. I just upgraded from my 20d to a 5dIII. I love it but today I noticed a bright red dot in a picture without enlarging the picture. I went back and enlarged others around the same spot and could find the dot again at all ISO's.. even at 100. I just did a 30 second exposure at 800 ISO with the lens cap on and I got this.
http://i.imgur.com/GRrg0.jpg
Now I expect a couple bad pixels but I can count about 12 spots and some spots have way more than just 1 bad pixel I believe. I tried the manual cleaning trick multiple times for up to 4 minutes and I still have atleast 10 spots and it seems to not be improving so I stopped. Is this average or did I get a lemon? Also adobe camera raw fixes about 2/3rds of them but definitely not all now that I know where to look. I have 23 more days to return it to amazon. Thanks guys for your help.
5dIII; 40mm 2.8, 16-35mm 2.8L II, 100mm Macro 2.8L IS, 70-300 4-5.6 IS, 70-200mm 2.8L II, 24-70mm 2.8L II

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5dIII hot pixel question
« on: July 28, 2012, 02:06:41 AM »

MattBicePhotography

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Re: 5dIII hot pixel question
« Reply #1 on: July 28, 2012, 02:27:32 AM »
Whoa, That should be on its way to warranty service. That is not normal, or acceptable at all.

HoneyBadger

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Re: 5dIII hot pixel question
« Reply #2 on: July 28, 2012, 04:38:55 PM »
Thanks. That is what I thought. I hate to exchange things but in this case because of the money I want it to be almost perfect. 1 or 2 speckled in different places wouldnt be too bad. Anyone else think this is not acceptable? I hope the one I exchange for is not worse.
5dIII; 40mm 2.8, 16-35mm 2.8L II, 100mm Macro 2.8L IS, 70-300 4-5.6 IS, 70-200mm 2.8L II, 24-70mm 2.8L II

Drizzt321

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Re: 5dIII hot pixel question
« Reply #3 on: July 28, 2012, 06:01:42 PM »
Hmm...makes me want to do the same thing to double check for hot pixels. *whoosh* Off to test!
5D mark 2, 5D mark 3, EF 17-40mm f/4L,  EF 24-105mm f/4L IS USM, EF 135mm f/2L, EF 85mm f/1.8
Film Cameras: Mamiya RB67, RB-50, RB-180-C, RB-90-C, RB-50, Perkeo I folder, Mamiya Six Folder (Pre-WWII model)
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HoneyBadger

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Re: 5dIII hot pixel question
« Reply #4 on: July 28, 2012, 06:58:19 PM »
Lol I wish you luck. Let me know what you find so I can make a comparison to what is standard on these cameras.
5dIII; 40mm 2.8, 16-35mm 2.8L II, 100mm Macro 2.8L IS, 70-300 4-5.6 IS, 70-200mm 2.8L II, 24-70mm 2.8L II

RunAndGun

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Re: 5dIII hot pixel question
« Reply #5 on: July 28, 2012, 09:15:08 PM »
This early in and still being within your exchange/return window, send it back.  I have a MKIII and it's been good, so far(got it "opening day").  BUT my first MKII(Dec '08) had hot pixel clusters start to show up within a few months and I ended up sending it in to Canon under warranty.  I have another MKII body I bought in Oct/Nov '11 and it has lit pixel clusters that I started to notice in March/April, about the same length of time, I believe, that the pixels started appearing on my first body.

Mt Spokane Photography

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Re: 5dIII hot pixel question
« Reply #6 on: July 28, 2012, 09:59:09 PM »
I did not find any hot pixels on my 5D MK III, in fact it was amazingly devoid of them.  But then, I did not try to create them with a super long exposure.
If you actually need 30 sec exposures at ISO 800, take a dark frame and subtract it.  Thats pretty much the standard for long exposures.

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Re: 5dIII hot pixel question
« Reply #6 on: July 28, 2012, 09:59:09 PM »

victorwol

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Re: 5dIII hot pixel question
« Reply #7 on: July 29, 2012, 12:25:15 AM »
It is sort of normal for 30 seconds exposure if you don't let the camera do its noise reduction by taking the second pic automatically. But be aware that if you are using any resolution other than full size RAW you will see even more rd pixels since the substraction of noise and hot pixels seems to work only on full size raw, at least on my experience..l.
1D X - 5D MKIII - 7D - 24 f1.4L - 8-15 L - 50 1.2L - 85 1.2L - 15 2.8 - 16-35 2.8L - 24-105 4.0L - 70-200 2.8 LII - 24 TSE - 45 TSE - 90 TSE - MPE 65 - 180 f3.5L - 100 2.8L II - 580EX and a few Einsteins.

fallenflowers

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Re: 5dIII hot pixel question
« Reply #8 on: July 29, 2012, 02:12:01 AM »
i also have a 5d mark iii, i never knew about this testing until i read your post. so i decided to give it a try with cap on at iso 100 30s i saw only 1 ho pixetl, iso400 30s this time i saw 8, iso 800 30s 14 hot pixels and iso 2000 at 30s around 20 hot pixels. when i turned on noise reduction for iso 800 at 30s i think i saw only 1, so if you are concerned about hot pixels, just turn on nr and you should be fine. i know your hot pixels are consistent at any given iso, i think it's normal (12), if you decided to send to canon they would probably say the same, unless you have dead pixels, than that would be different story.

fallenflowers

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Re: 5dIII hot pixel question
« Reply #9 on: July 29, 2012, 02:16:57 AM »
looking at the pics u provided at iso 800, you are getting almost the exact number of hot pixels as mine, so i think this is normal for 5d mark iii. how about you guys out there who has 5d3 can you try this testing and post your results?

Chewy734

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Re: 5dIII hot pixel question
« Reply #10 on: July 29, 2012, 09:07:06 AM »
But, I thought HoneyBadger don't care?  ;)

I'm gonna try your long exposure technique on my 1D X and report back my findings.

mrmarks

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Re: 5dIII hot pixel question
« Reply #11 on: July 29, 2012, 09:42:27 AM »
You may need to heat up the sensor via live view for 3-4 minutes before the manual sensor cleaning http://photography-on-the.net/forum/showthread.php?t=1170332

ed24

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Re: 5dIII hot pixel question
« Reply #12 on: July 29, 2012, 05:07:27 PM »
I don't really know what to say....

http://imgur.com/TVESJ

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Re: 5dIII hot pixel question
« Reply #12 on: July 29, 2012, 05:07:27 PM »

HoneyBadger

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Re: 5dIII hot pixel question
« Reply #13 on: July 29, 2012, 05:32:41 PM »
oh wow. Do any show up in pictures you take?
5dIII; 40mm 2.8, 16-35mm 2.8L II, 100mm Macro 2.8L IS, 70-300 4-5.6 IS, 70-200mm 2.8L II, 24-70mm 2.8L II

HoneyBadger

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Re: 5dIII hot pixel question
« Reply #14 on: July 29, 2012, 05:50:49 PM »
Also do you guys noticed different colors of black when you zoom into your test pictures. Zoom into mine and there are a lot of black and lighter black patches.
5dIII; 40mm 2.8, 16-35mm 2.8L II, 100mm Macro 2.8L IS, 70-300 4-5.6 IS, 70-200mm 2.8L II, 24-70mm 2.8L II

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Re: 5dIII hot pixel question
« Reply #14 on: July 29, 2012, 05:50:49 PM »