Bright pink dot in photos?

Ted

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Well, this is disappointing! As some of you know, I picked up my first mirrorless system last week- an E-M5. I was just doing some ISO tests then to get an idea of how much noise to expect at different settings and I'm noticing a bright pink dot in every photo I take. It's small enough that I never noticed it until doing these tests, so maybe it's not even an issue, but it's certainly there. I've tried numerous focal lengths, apertures and ISO settings, even shooting with the lens cap on and it's there in all of them (though the shutter does need to be slow enough to let some light in, in this case). I figure I should take it back to where I bought it from? :frown:
 

Ted

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Actually, with the lens cap on it's more of a red dot. It looked pink against the white cone in the speaker I was photographing though. If I shoot in monochrome it is grey, obviously.
 

Ted

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Dot can be seen very close to the centre of the speaker cone, as well as enlarged. I also just tried zooming in on the EVF and seeing if it were there before hitting the shutter button, it isn't.
Subscribe to see EXIF info for this image (if available)
 

Ted

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I have no idea what pixel mapping is, but it fixed it! Thank you very much, this forum is amazing!
 

fortwodriver

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Pixel mapping simply reads the sensor for any pixels that are firing (or registering a value) as hot and creates a little database of pixels to ignore. Nearly every sensor out there has a few hot pixels. Some don't develop right away, others are taken care of when the factory runs the first mapping right after manufacture.

Enjoy the camera!
 

rfortson

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Yep, it's a hot pixel. Pixel mapping locks out the bad pixels so they don't affect your pictures. It's a neat feature and many cameras offer it now. Also, Lightroom automagically corrects for them when you import your images. Other image editing programs probably do it, too.

All cameras have hot pixels, and will develop them over time. Pixel mapping is a great fix.
 

Mikefellh

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Hot pixels is something TOTALLY DIFFERENT!

These were stuck pixels (always on no matter what).
Dead pixels are pixels that are always off.

Pixel mapping fixes both of those things (lucky we can do it ourselves...some other brands need to go back to the factory).

Hot pixels only show up during long exposures, and there's noise reduction to fix that which does a dark frame subtraction.
 

Ross the fiddler

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Hot pixels is something TOTALLY DIFFERENT!

These were stuck pixels (always on no matter what).
Dead pixels are pixels that are always off.

Pixel mapping fixes both of those things (lucky we can do it ourselves...some other brands need to go back to the factory).

Hot pixels only show up during long exposures, and there's noise reduction to fix that which does a dark frame subtraction.
Which is why Pixel Mapping should be done when the camera is cool or cooled down. Not when it is warm.
 
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