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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 28 Jun 2009 (Sunday) 20:48
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50D with recent odd pixels showing up. need advice.

 
avbcon12
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Location: PhiladeIphia PA
     
Jun 28, 2009 20:48 |  #1

So heres the story, as a lot of people around the US I too am getting ready for some nice firework shots. tonight I decided to just take a few very low light test shots inside my apartment.

The picture below was taken at apeture priority, Large JPEG (just for testing), and I came up with these four artifacts in the center of my picture towards the bottom. There is a reduced size image with a 100% crop below it.

I havent done much messing with it yet to see how to get rid of them. The picture is horrible quality and out of focus etc, as stated it was just for testing. no matter what i shoot at they are always in the same spot.

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100% crop:

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any ideas??

Thanks in advance

50D, BG-E2, 24-70mm f2.8L, 50mm f1.8, 580EX2, 430EX2, PW's etc...

  
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alann
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Jun 28, 2009 20:51 |  #2

Are you sure it's not dust on the sensor?


My FLickrPage (external link)

  
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avbcon12
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Jun 28, 2009 20:52 |  #3

not positive but I suppose it could be.

I just took another shot in higher light and the artifacts arent there anymore. Thats with the same ISO, same apeture, etc. just faster shutter speed.


50D, BG-E2, 24-70mm f2.8L, 50mm f1.8, 580EX2, 430EX2, PW's etc...

  
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Duncan ­ Frenz
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Jun 28, 2009 20:54 |  #4

Hot pixels. They occur when shooting long exposures > 1 sec. You can enable long exposure noise reduction which applies a black frame subtraction exposure on shots > 1 second, but doubles the time before you can take another image. That picture would have taken 30 seconds (15 sec. for image + 15 sec. black frame exposure). You can also clone stamp them out in pp.


- Duncan
Gear_Mor
e than I need, Less than I want
Nonconformists are all alike.
I am not an expert, but I play one on the internet.:D

  
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avbcon12
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Jun 28, 2009 20:56 |  #5

Duncan Frenz wrote in post #8191572 (external link)
Hot pixels. They occur when shooting long exposures > 1 sec. You can enable long exposure noise reduction which applies a black frame subtraction exposure on shots > 1 second, but doubles the time before you can take another image. That picture would have taken 30 seconds (15 sec. for image + 15 sec. black frame exposure). You can also clone stamp them out in pp.

Ok, is it something that canon might be able to fix if the body is sent in? id rather not pixel peep every image at 100% crop to find each artifact and PP them out. Thanks


50D, BG-E2, 24-70mm f2.8L, 50mm f1.8, 580EX2, 430EX2, PW's etc...

  
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Ivoryplum
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Jun 28, 2009 21:22 |  #6

avbcon12 wrote in post #8191592 (external link)
Ok, is it something that canon might be able to fix if the body is sent in? id rather not pixel peep every image at 100% crop to find each artifact and PP them out. Thanks

I don't beileve so.
Both my 20D and 50D do this.


Canon 50D {Gripped} | 20D | 580EX II
70-200mm f/4L USM | EF-S 10-22mm f/3.5-4.5 | 50mm f/1.8 II | Sigma 28-300mm f/4-6.3 | Canon 28-90 f/4-5.6 | Manfrotto 190XPROB w/ 322RC2 Ball Head | Vertex 100AW
- Photography page - http://yestrdaysforgiv​n.deviantart.com/ (external link)
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Duncan ­ Frenz
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Jun 28, 2009 21:32 |  #7

avbcon12 wrote in post #8191592 (external link)
Ok, is it something that canon might be able to fix if the body is sent in? id rather not pixel peep every image at 100% crop to find each artifact and PP them out. Thanks

Unfortunately, this is something ALL digital cameras are sensitive to with long exposures. The longer the exposure the hotter the sensor becomes and hence the 'hot' pixels. They are always improving, but it is probably something we will have to deal with for the next few generations at the very least.

In the mean time, don't fret over a few hot pixels, they are easy to remove by automation or hand. Go check out the astrography section as they deal with it on a daily basis and probably have the best methods for removal.


- Duncan
Gear_Mor
e than I need, Less than I want
Nonconformists are all alike.
I am not an expert, but I play one on the internet.:D

  
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avbcon12
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Jun 28, 2009 21:55 |  #8

Thanks guys!


50D, BG-E2, 24-70mm f2.8L, 50mm f1.8, 580EX2, 430EX2, PW's etc...

  
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Photon ­ Phil
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Jun 28, 2009 22:06 |  #9

Welcome to pixel peeping...where...afte​r time...one learns that the abnormal is normal. It's like the Twilight Zone except that you pay thousands to enter and never escape.


Bodies: SONY A850 / Pentax K100D / D70 (18-55VR, 55-200)
Primes: Minolta 28 ff2.8 / Minolta 50 f1.7 / Minolta 50 f2.8 Macro
Zooms: 35-70 f4 / 100-200 f4.5 Lights: AB800 / AB400 & CSRB's
Classics:
Pentax Super Tak 50 f1.4 / Pentax SMC 50 f1.4,f1.7,f2.0

  
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avbcon12
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Jun 28, 2009 22:14 |  #10

bohlenphotography wrote in post #8191961 (external link)
Welcome to pixel peeping...where...afte​r time...one learns that the abnormal is normal. It's like the Twilight Zone except that you pay thousands to enter and never escape.

haha, thanks! its nice to know im welcome


50D, BG-E2, 24-70mm f2.8L, 50mm f1.8, 580EX2, 430EX2, PW's etc...

  
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MrSteve
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Jun 28, 2009 23:44 |  #11

avbcon12... Try this, http://blog.willshootp​hotography.com/2008/10​/canon-50d-hot-p.html (external link) . I had 4 hots pixels and now I am down to 1. To be honest the hot pixels really didn't bother me that much, just 4 more (down to 1 now) clicks when working in DP.

How or why the above link works I have no clue, just seems weird to me that the sensor is "live" while doing a manual cleaning (I did not clean, just what the link states to do), but like I said it worked for me.


Canon 50D, Canon 28-135

  
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Duncan ­ Frenz
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Jun 28, 2009 23:56 |  #12

MrSteve wrote in post #8192377 (external link)
avbcon12... Try this, http://blog.willshootp​hotography.com/2008/10​/canon-50d-hot-p.html (external link) . I had 4 hots pixels and now I am down to 1. To be honest the hot pixels really didn't bother me that much, just 4 more (down to 1 now) clicks when working in DP.

How or why the above link works I have no clue, just seems weird to me that the sensor is "live" while doing a manual cleaning (I did not clean, just what the link states to do), but like I said it worked for me.

Yes, this works quite well, though it should be noted that it may take several tries. However, this is more for hot pixels that appear under 'normal' exposures i.e. <1 second. Once you hit >30 seconds, you can pretty much count on getting a few if not a ton of hot pixels.


- Duncan
Gear_Mor
e than I need, Less than I want
Nonconformists are all alike.
I am not an expert, but I play one on the internet.:D

  
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MrSteve
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Jun 29, 2009 00:05 |  #13

Agree, mine were showing at the normal" range... Only one try and I am down to one, I was happy with that, but I'll try it again someday and see if the last one will go away as well.


Canon 50D, Canon 28-135

  
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slewfoot
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Jun 29, 2009 00:16 |  #14

I had a hot pixel that showed up on 1 second exposures. I used the method described in the above link (body cap on with manual cleaning...though I read about it in a thread here on POTN a few months back).
It was a very very stubborn pixel (but not as stubborn as me). It took several attempts, and some 'exposures' that lasted a few minutes..yes, minutes...but the hot pixel is no longer hot.




  
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avbcon12
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Jun 29, 2009 08:28 |  #15

Im trying that method now, thanks a lot!


50D, BG-E2, 24-70mm f2.8L, 50mm f1.8, 580EX2, 430EX2, PW's etc...

  
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50D with recent odd pixels showing up. need advice.
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