bclaff
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Re: is it normal to have this much dead pixel on the brand new canon ra?
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Marco Nero wrote:
bclaff wrote:
Light Pilgrim wrote:
I had 50-60 dead/stuck/hot pixels on a brand new R5. Several on lcd. Service mapped sensor pixels and I am still fighting for them to replace lcd.
The only cameras I have seen with that many defect pixels were on the International Space Station (ISS) where they are subject to a lot of cosmic radiation; so I don't believe your 50-60 count.
If your R5 is still showing a significant number of defects then we should do my test to get an objective measurement.
As for the LCD that is an entirely different matter.
I had well over 1,200 stuck pixels and hot pixels after my first hour of shooting 25-second exposures with a brand new Canon EOS 6D.
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What you describe sounds like Dark Signal Non-Uniformity (DSNU) which is distinct from defect pixels. DSNU generally appears in exposures of over about 4 seconds.
I'm in the middle of writing an article for PhotonsToPhotos on this subject.
Cosmic Rays can affect an LCD but in an entirely different manner. ....
I wasn't referring to the LCD but the image sensor.
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The NASA crew on the ISS tends to use Nikon DSLR cameras which are well shielded against cosmic radiation inside the ISS - mostly by the Earth's Magentic Fields. ...
I have many many raw files from the ISS and I can assure you that they are very affected by cosmic rays (I was contacted about how to automatically remove these in post processing and have had good success.)
The astronauts may not be significantly affected but I assure you the camera image sensors are.
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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )