is this normal? pic taken by e500

[drewdam]

Hi,

bought the E500 from one of the CSer, tested day pic quite ok but when shoot tonite, the pic has lots of red, blue n green dots..is this noise? i turn off the NR in the menu. kindly advise...tks



cropped section

[gooseberry]

That does not look normal at all.

[kcuf2]

ya..this isnt normal..noise doesnt look like tat..

[tomcat]

You are supposed to turn on the NR for such long exposure shots.

[shchow]

yup.. that's normal. like tomcat say, you are supposed to turn on the NR.

[weekh]

The e330 has this too if NR is not turned on.

[major_tom]

dont panic. it's 'normal'...had similar experience once. Just to reiterate what the bros said said earlier - turn Noise Reduction to 'ON' in future for long exposure shots.

[gooseberry]

That is normal for the olympus e-system cameras without long exposure NR ? so many red, green and blue pixels... drewdam, how long was the exposure for ?

[drakon09]

This is normal for all DSLRs.

What happens is that during long exposures (in excess of 3 seconds), the CCD "heats" up causing distorted pixels (as shown by the RGB dots).

Now for the life of me I cannot remember how long-exposure NR works, I think it goes along the lines of using a black reference shot... the bros who know please enlighten.

[gooseberry]

Originally Posted by drakon09 This is normal for all DSLRs. What happens is that during long exposures (in excess of 3 seconds), the CCD "heats" up causing distorted pixels (as shown by the RGB dots). Now for the life of me I cannot remember how long-exposure NR works, I think it goes along the lines of using a black reference shot... the bros who know please enlighten.

I know about long exposure noise and what it looks like on Canon and Nikon DSLRs without long exposure NR turned on, and it is no where near what I see it above (exposure times of upto about 1 minute) - seems it is different for e-system cameras.

[drakon09]

It has to do is pixel density.

4/3 sensors have higher pixel density than most, making it more susceptible to long exposure noise (and high ISO noise).

It is one of the tradeoffs of a lighter system. However, it is easily solved by the in-camera NR, or with despeckling on your photo editing software.

[drewdam]

ya was panic at 1st , 1st thing in my mind was..damn don't tell me i need to visit Oly service ctr lio ..bcos my FZ20 has no sush problem @8sec.

the above pic was taken at iso400/f11/1.3sec. and is true no diff in pic quality w or w/o NR at slow shutter speed at iso400.

tks appreciate input from you guys ...

[drakon09]

Yup, nothing post processing despeckling can't handle.

And if THAT doesn't work, just pixel peep and fill it up with the appropriate colours.

[tomcat]

umm... the EXIF of the image says ISO 100, 13s, f/11

[scandisk]

could be a problem with the ccd - hot pixels ??

[drewdam]

Originally Posted by tomcat umm... the EXIF of the image says ISO 100, 13s, f/11

OOP!! ya that's ISO100

here's another no PP convert to Jpeg n cropped. and cfm this one at ISO400/2.5sec





btw, is there any NR program that i can uses?

tks

[drakon09]

I think NeatImage is available free... *i think*....

NoiseNinja does a pretty good job as well...

Personally, I do Gaussian blurring and despeckling on PS, works pretty well, but time-consuming.

Then again I avoid surgical post-processing unless absolutely necessary...

The cropped image you posted, is that 100% from a 8 MP image?

[drakon09]

Originally Posted by scandisk could be a problem with the ccd - hot pixels ??

Probably not, hot pixels shine a bright green and exist in the same location in ALL photos.

If that's the case just do some pixel mapping.

[drewdam]

Originally Posted by drakon09 I think NeatImage is available free... *i think*.... NoiseNinja does a pretty good job as well... Personally, I do Gaussian blurring and despeckling on PS, works pretty well, but time-consuming. Then again I avoid surgical post-processing unless absolutely necessary... The cropped image you posted, is that 100% from a 8 MP image?

pic was taken RAW, should be the max 8MP.

[u2nofear]

i think my hotpixel much much than u...if noise reduction not turn on