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Hot Pixels issue
Folks,Can you help me with following:.

Few days ago I bought a DSLR camera Olympus E400 double zoom kit, previously I have self-DSLR camera Fuji FinePix S5500.

When I make some night shots in my picture were found hot pixels, at my old camera I never seen hot pixels before (100%-200%, probably noise redution at this camera work properly).

As I understood hot pixels it's a not CCD defect, but photo made in following condition:exposure 5, 10, 30sec/ISO100 - hot pixels are present at photo (NR switch ON)exposure 60sec/ISO100 - hot pixels are absent (NR switch ON)Is it a noraml situation?.

If yes, how can I properly eliminate that pixels, because I test BlackFrame programm and similar and did get a very good results, I would say 80-85% of hot pixels were removed, if you are making photo at RAW format, PhotoShop very perfectly eliminating affected pixels, but RAW format is not comfortable for meIs it possible to fix hot pixels something like as stuck pixels via remapping?Does it make sense?Thanks in advance for your advices!Jurek..

Comments (10)

NR = dark-frame subtraction, in-camera; hence, the 2x time..

Comment #1

But it looks like that NR working only for 60sec exposure, for less exposure looks like that NR n/a or do not work properly, what found at forums, at noraml way hot pixels should to arrive at bigger ISO, not at ISO100 with short exposure (5-15sec).

So, is it a normal situation wit hot pixels or should return my camera for a service?Thanks!..

Comment #2

You'll have to read the manual. NR only works at certain shutter speeds even if it is turned on. Essentially if after you take a shot the camera takes the same time with the screen black then you know that it's taking a dark screen shot for subtraction. I may have read somewhere that it only works on shutter speeds greater than 5 sec. but am probably wrong..

The actual hot pixels are seen at all shots. On your Oly you can do a pixel mapping and the camera will map out defective pixels. On the Oly this is a very safe operation and will not harm your camera or pictures. I'd suggest you try that as well. Oh, and go ahead and map it a couple of times just to make sure you've gotten them all.A member of the rabble in good standing...

Comment #3

Thanks a lot for your answer, but the main issue that I remap my Oly if I'm not mistaken 5 or 6 times, do I need to remap my camera more? (To eliminate all hot pixels)?:)Thanks!..

Comment #4

Bit of a design weirdness, I suppose Oly dark-noise subtraction does have a minimum shutter speed for triggering on all present models AFAIK..

If you're shooting in the range where there's some such pattern noise but NR won't trigger best option probably would be to take a similar dark frame and apply in post-processing the way you've already done...

Comment #5

Leejay Wu wrote:.

Bit of a design weirdness, I suppose Oly dark-noise subtractiondoes have a minimum shutter speed for triggering on all presentmodels AFAIK..

If you're shooting in the range where there's some such pattern noisebut NR won't trigger best option probably would be to take asimilar dark frame and apply in post-processing the way you'vealready done..

In fact, if you're taking a lot of pictures at night and all in about the same shutter time range. It's easiest to just take one or two dark frames of the same or similar shutter times with the lens cap on at the beginning of the session. Take all your shots with NR off (saving a lot of time) and post process them all as a batch.A member of the rabble in good standing...

Comment #6

Folks, I was at Oly servise - they took my camera for repairing, will see what would the results, but from the words of serviceman no should be hot pixels at ISO100 and long exposure (hot pixels in noraml way should to appear at ISO400and hihger) it's look likes that it's a CCD defects - folks from the service accept my camera and my claimI'll inform about results of repairing: does it help or noAnyway - THANKS A LOT for you advices, it was usefull for meJurek..

Comment #7

By the way, does anybody knows about software which allow hot pixel remapping for Ole E400?Thanks..

Comment #8

It's built into the camera.A member of the rabble in good standing...

Comment #9

But it's do not work properly, that's why I return my camera to service (hope it will help), but for would be great to have some software, becuase it's a long time to wait 2 or weeks for camera repairing.....

Comment #10

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