Canon 500D stuck/hot pixels fix

bclaff wrote:

karl mohr wrote:

Not nearly so useful as mapping the bad pixels out since this doubles the exposure time for every image taken.

Unfortunately, long exposure noise reduction, is probably the best way to deal with this. I know waiting for the 'black frame' is annoying and time consuming. I also sometimes do 3 and 4 minute exposures. As you could imagine waiting for the black frame is even more intense. I have since started working with 2 cameras when I do this - alternating which camera is on the tripod. (At least you can move the camera when the black frame is exposing).

I was actually surprised when I first noticed this happening on a brand new 70D during 20 and 30 seconds daytime exposures. I don't think there's anything wrong with your camera - it's just a fact of life. Maybe going full-frame might help, my friend with a 5D3 doesn't complain about this.

As far as the pixel mapping, I fixed my new-in-box T2i when I first got it. This is a heavily cropped 'before' image fresh out of the box....

I strongly disagree.

Long Exposure Noise Reduction (LENR) is not only time consuming but you're likely to get a black pixel at the "bad" pixel location.
Whereas mapping is likely to give you the average of nearby pixels; that's a more reasonable outcome.

Remember, the topic is "bad" pixels not noise from long exposures.

Those spots/blemishes of the OP's example photos look like noise to me. But by all means, the OP could send it to Canon for checking and mapping, doubt it would help much, but if LENR is too inconvenient he could try....