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#1
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New Canon 350D/Rebel XT Noise Tests
Hi All,
I've placed two articles looking at 350D/Rebel XT image noise in daytime and nighttime shooting up on DIMi http://www.dimagemaker.com/article.php?articleID=531 and placed all the RAW files for people to download and examine themselves if they are interested http://www.dimagemaker.com/specials/cameras/camtests.php Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ |
#2
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New Canon 350D/Rebel XT Noise Tests
In article .com,
"wayne" wrote: Hi All, I've placed two articles looking at 350D/Rebel XT image noise in daytime and nighttime shooting up on DIMi http://www.dimagemaker.com/article.php?articleID=531 and placed all the RAW files for people to download and examine themselves if they are interested http://www.dimagemaker.com/specials/cameras/camtests.php Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ The noise reduction option is for hot pixels only. It's useful for very long exposures, say over 10 minutes. The Canon DSLRs have noise reduction built into the sensor that compensates for stray charge offsets in each pixel. You can't turn it off. There's also some software noise reduction if you use Canon's software to convert the RAW file. |
#3
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New Canon 350D/Rebel XT Noise Tests
"Kevin McMurtrie" wrote in message ... In article .com, "wayne" wrote: Hi All, I've placed two articles looking at 350D/Rebel XT image noise in daytime and nighttime shooting up on DIMi http://www.dimagemaker.com/article.php?articleID=531 and placed all the RAW files for people to download and examine themselves if they are interested http://www.dimagemaker.com/specials/cameras/camtests.php Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ The noise reduction option is for hot pixels only. It's useful for very long exposures, say over 10 minutes. The Canon DSLRs have noise reduction built into the sensor that compensates for stray charge offsets in each pixel. You can't turn it off. There's also some software noise reduction if you use Canon's software to convert the RAW file. My 350D has a long exposure noice reduction - Custom Function 2 in the menu on P A S / M modes. Alex |
#4
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New Canon 350D/Rebel XT Noise Tests
In article ,
"alex" wrote: "Kevin McMurtrie" wrote in message ... In article .com, "wayne" wrote: Hi All, I've placed two articles looking at 350D/Rebel XT image noise in daytime and nighttime shooting up on DIMi http://www.dimagemaker.com/article.php?articleID=531 and placed all the RAW files for people to download and examine themselves if they are interested http://www.dimagemaker.com/specials/cameras/camtests.php Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ The noise reduction option is for hot pixels only. It's useful for very long exposures, say over 10 minutes. The Canon DSLRs have noise reduction built into the sensor that compensates for stray charge offsets in each pixel. You can't turn it off. There's also some software noise reduction if you use Canon's software to convert the RAW file. My 350D has a long exposure noice reduction - Custom Function 2 in the menu on P A S / M modes. Alex Yes, that's dark frame subtraction. It activates when the exposure is =30 seconds at ISO 100-800 or =1 second at ISO 1600. A second photo will be taken with the shutter closed. NR is best left turned off until your exposures are long enough to develop hot pixel problems. That can be over 10 minutes for some Canons. The dark frame subtraction process can slightly damage a photo by subtracting dynamic noise that doesn't correlate to noise in the photo taken. |
#5
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New Canon 350D/Rebel XT Noise Tests
"Kevin McMurtrie" wrote in message ... In article , "alex" wrote: "Kevin McMurtrie" wrote in message ... In article .com, "wayne" wrote: Hi All, I've placed two articles looking at 350D/Rebel XT image noise in daytime and nighttime shooting up on DIMi http://www.dimagemaker.com/article.php?articleID=531 and placed all the RAW files for people to download and examine themselves if they are interested http://www.dimagemaker.com/specials/cameras/camtests.php Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ The noise reduction option is for hot pixels only. It's useful for very long exposures, say over 10 minutes. The Canon DSLRs have noise reduction built into the sensor that compensates for stray charge offsets in each pixel. You can't turn it off. There's also some software noise reduction if you use Canon's software to convert the RAW file. My 350D has a long exposure noice reduction - Custom Function 2 in the menu on P A S / M modes. Alex Yes, that's dark frame subtraction. It activates when the exposure is =30 seconds at ISO 100-800 or =1 second at ISO 1600. A second photo will be taken with the shutter closed. NR is best left turned off until your exposures are long enough to develop hot pixel problems. That can be over 10 minutes for some Canons. The dark frame subtraction process can slightly damage a photo by subtracting dynamic noise that doesn't correlate to noise in the photo taken. Kevin, If I switch it on, does is stay inactive as long as exposures are 30secs? Am I better off doing this in Paintshop/Photoshop? or is it worthwhile when the circumstances call for it? Cheers Alex |
#6
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New Canon 350D/Rebel XT Noise Tests
In article ,
"alex" wrote: "Kevin McMurtrie" wrote in message ... In article , "alex" wrote: "Kevin McMurtrie" wrote in message ... In article .com, "wayne" wrote: Hi All, I've placed two articles looking at 350D/Rebel XT image noise in daytime and nighttime shooting up on DIMi http://www.dimagemaker.com/article.php?articleID=531 and placed all the RAW files for people to download and examine themselves if they are interested http://www.dimagemaker.com/specials/cameras/camtests.php Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ The noise reduction option is for hot pixels only. It's useful for very long exposures, say over 10 minutes. The Canon DSLRs have noise reduction built into the sensor that compensates for stray charge offsets in each pixel. You can't turn it off. There's also some software noise reduction if you use Canon's software to convert the RAW file. My 350D has a long exposure noice reduction - Custom Function 2 in the menu on P A S / M modes. Alex Yes, that's dark frame subtraction. It activates when the exposure is =30 seconds at ISO 100-800 or =1 second at ISO 1600. A second photo will be taken with the shutter closed. NR is best left turned off until your exposures are long enough to develop hot pixel problems. That can be over 10 minutes for some Canons. The dark frame subtraction process can slightly damage a photo by subtracting dynamic noise that doesn't correlate to noise in the photo taken. Kevin, If I switch it on, does is stay inactive as long as exposures are 30secs? Am I better off doing this in Paintshop/Photoshop? or is it worthwhile when the circumstances call for it? Cheers Alex Experiment with it. I find that it's best off except in rare situations. If you take an hour long photo of stars sweeping through the sky, you'll have a hard time getting a software noise filter to remove hotpixels without damaging trails. On the other hand, dark frame subtraction in the camera knows exactly what pixels to blur out. The downside is that you can't take another photo for an hour. |
#7
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New Canon 350D/Rebel XT Noise Tests
My understanding is that even if on, NR is only active on exposures of
30 seconds and more (except at 1600ISO, where it is 1 second or more). Cheers, Wayne Wayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog and Podcast http://www.digitalimagemakerworld.com/ Personal art site http://www.artinyourface.com/ |
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