Recently I did a spot of night time photography including some time lapses with my 50D, on examining the photos a few days later I noticed a nasty little red spot on one of the images. Closer inspection found me three of the little blighters, so it looks like I’ve got myself some hot pixels on the sensor.
Above is a 100 percent crop of a 4 second exposure with no lens, this is the most prominent hot pixel, click on the picture for the full size image. If you look at the file at 100 percent, (ala a pixel peeper – LOL) you will see them. It’s pretty much Top Middle, Middle Left, Bottom Left.
I’ve tried the various methods around the place that suggest the sensor can be remapped by the camera, all to no avail. Seeing it’s only 8 months old, today I dropped it off for a warranty claim and it’s gone to Sydney.
Wish me luck, took me 6 weeks to get the last camera back that I sent to Canon for repairs.
Ouch, that is annoying. I hope you get it back in time.
I tried a 4 second shot with the lens cap on in RAW mode with ISO 1600. I see thousands of hot or warm subpixels. My 50D is brand new, 2 days ago. I tried the manual sensor cleaning trick, but that had no noticeable effect.
Could this perhaps be normal? I have nothing anywhere near as bright as the red spot in your picture above. None of mine are visible unless I actively go looking for them.
I should post a follow up, I’ll do that shortly. The camera came back from the service centre perfectly fine and the three hot pixels were gone.
You will see grain and pixels when doing a blank time exposure at high ISO that’s just random noise which shouldn’t affect an actual photos.
Happy to compare images with you if you want.