Hot Pixels / Stuck Pixels (EOS 350D) - a cure?
I noticed the appearance of a cluster of about 12 red/pink 'stuck' pixels about a fortnight ago. They appeared on all images irrespective of shutter speed used/ISO settings, etc.
Having read speculation on the EOS 5D section of this forum about the issue of stuck/hot pixels, I decided to try a cure suggested for the EOS 5D camera in that forum.
Firstly I removed the battery from my camera for 3 days. Then I put the battery back in and took a 'black' picture with the lens cap on. (You have to set A1 servo mode first, to allow the camera to take a picture without focussing). I did this to see if the 3 days without the battery in had solved the problem.
Then with the lens on the camera and the lens cap on the lens, and the lens pointing to the floor, I activated the 'Sensor Clean' function for about 30 seconds. (Obviously with a lens on, I made no effort to clean the sensor before, after or during this operation!). At the end of the 30 seconds, I switched the camera off to close the shutter and return the mirror. Afterwards, I reset the camera to its default settings and cleared the custom functions (both via the menu setting), just for the sake of enabling a general reset of the camera.
I then took a set of normal pictures to see if this process had made any difference. When I transferred the pictures to the computer to view them, the 'black' shot taken before the sensor clean clearly showed the hot pixel cluster, from which I conclude that the 3 days without a battery in, had made no difference and was just a waste of time - but it proved a point.
In the pictures taken after the sensor clean though, all the stuck/hot pixels had gone and the entire images were free from any hot/stuck pixels. The problem had been completely cured.
I suspect that the return to default settings and resetting the custom functions made no difference actually, but it did no harm.
I am now of the opinion that operating the sensor clean function with a lens on and a lens cap on the lens, causes the camera to either map out hot/stuck pixels, or to reset itself, neutralizing them. Pure speculation of course, but it solved the problem completely in 30 seconds. (N.B. I did not clean the sensor at any point and have never done so.)
EOS 350D camera, standard kit lens used, latest firmware version (1.0.3)
Wauw, that is interesting!
Could you maybe post a crop with the stuck pixels? - 12 sounds like awfully many hotpixels next to each other. Maybe it was indeed just some dust on the ccd?
It amazes me that the same old tired threads involving such interesting topics as "which lens should I buy?" and "why can't I have live preview on my dslr?" get numerous replies, but a helpful thread like this goes almost totally ignored. Truly helpful posts are few and far between so thanks for posting this. I have some hot pixels so I'm going to go try this out.
Although I don't (yet) have this problem with my own camera, it's highly likely I will do in the future. Thanks for taking the time posting your results.
Canon 350D * Kit Lens * SIGMA 18-200 F/3.5-6.3 DC Zoom *
That is truly amazing.
I just got my camera back from its trip via FedEx to Canon and back.
My hot pixels are completely gone and interestingly enough the general noise level of the pictures is down too.
Could it be that Canon just gets the camera, does what you did (sensor clean function) and returns it back?
Wouldn't it be worth it for them to tell me on the phone to do it rather than pay shipping back to me?
In any case, this is very good to know for next time (when my warranty will not be there for me anymore...)
Yeah and that's why they supply PS in every software bundle?
Don't even get started thinking bad pixels are acceptable.
The next thing you know even a dirty sensor doesn't matter.
Maybe a chipped lens or scratched coating is fine too?
All the cameras have this. Most of the softwares removed it for you
(such as Photoshop).
I agree. This is a truly helpful post. Unfortunately it appears that it takes "controversy" for something to become a "popular" thread
It amazes me that the same old tired threads involving such
interesting topics as "which lens should I buy?" and "why can't I
have live preview on my dslr?" get numerous replies, but a helpful
thread like this goes almost totally ignored. Truly helpful posts
are few and far between so thanks for posting this. I have some
hot pixels so I'm going to go try this out.
None of the Canon software applications (Image Browser, DPP, etc.) remove this automatically. Neither does Photoshop CS2. You can clone or repair images yourself using them but they don't do it for you. But why should you have to?
I was hoping that your technique would work on my 20D... no such luck.
I followed all the instructions... but the hot pixels are still there.
Oh well... so much for a quick fix.
I tried this 'trick' earlier today after noticing 3 'clumps' of hot pixels through out several indoor pictures. After taking 3 pictures w/the lens cap on, I only noticed 2 hot pixels. Photoshop will take care of these. Thank you for that very helpful information.
Have a great evening
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