HELP! lot of white dots appearing in my night shots! Not stars

[Jeroen V]

Hi,

i have got a lot of white dots appearing on my night shots. And no they are not stars ;-).. Below is 100% crop don't look at the IQ it it tweaked a bit to show the spots better



Anyone knows what this?? And most important what to do? I've tried cleaning but this doesn't help a bit. I have mailed Fuji and waiting for an answer. So i hope you can tell me what to expect.

Thanks.

Jeroen
--
http://www.pbase.com/jeroenvisser

 

[E10inator]

Strange. I just cleaned my sensor it was pretty bad but the spots don't show up so sharp they are more soft not the sharp white spots that you have. Maybe over driven pixels? What ISO are you using?

 

[Bad Pic kev]

hot pixels maybe
--
Kodachrome
They give us those nice bright colors
They give us the greens of summers
Makes you think all the world's a sunny day, Oh yeah

 

[Jeroen V]

Hi,

shot was taken at iso100 f16 at + -15sec. What you see is just a small piece of the picture, the rest is also suffering from the same spots.

Jeroen

Strange. I just cleaned my sensor it was pretty bad but the spots
don't show up so sharp they are more soft not the sharp white spots
that you have. Maybe over driven pixels? What ISO are you using?

--
http://www.pbase.com/jeroenvisser

 

[Jeroen V]

Hi,

not sure what hot-pixels are. Are they pixels gone bad, i mean don't they work anymore?

Jeroen

hot pixels maybe
--
Kodachrome
They give us those nice bright colors
They give us the greens of summers
Makes you think all the world's a sunny day, Oh yeah

--
http://www.pbase.com/jeroenvisser

 

[Bad Pic kev]

it means they are stuck on. usually a camera might develop a few of them. if this is a partial pic, then it would have to be something else. maybe dust on the lens. my S2 is a few years old and has 5 stuck pixels. that would be a lot.
--
Kodachrome
They give us those nice bright colors
They give us the greens of summers
Makes you think all the world's a sunny day, Oh yeah

 

[Kraig]

http://webpages.charter.net/bbiggers/DCExperiments/html/body_hot_pixels.html

 

[greg77]

Hi, With that example it does kinda look like hot pixels. I would try taking a series of shots in a controlled dark environment using several ISO's and exposure comps. I would expect the least amount of hot pixels to show at ISO 100 and ex comp = +0.5 and the most at ISO 1600 and ex comp = -0.5 (under exposure at high ISO).

The main point is that if you see an increasing number of dots, then it would seem (to me) to point strongly in the direction of hot pixels.

For sake of comparison, I took the photo below at 30 secs, ISO 1600 with an S2 and probably ended up with about 2 or 3 hot pixels in the entire frame (on that pic and related test shots). I know the Milky Way looks like a river of white dots, but it's the only shot of that duration I have posted on the web. Actually, close inspection shows a potential hit pixel towards lower right, but that would come as no surprise. I would expect my S3 to show somewhere in the neighborhood of 0 to 2 in the entire frame for same settings. Regards, -Greg-



--
Greg
http://www.photo.net/photodb/member-photos?include=all&user_id=301372
http://www.pbase.com/coraltown/root

 

[au pics]

Hi,

I've had this happen as well on my S2 with it's new ccd, when I took shots in the outback at night. My testing showed that shots of over 5mins showed the white dots. ( shooting raw iso 100 f8) To me it maybe the down side of fuji not having the standard dark frame subtraction system found on other cameras?. But I do like not having wait for dark frame shots so it has pros and cons. There is dark frame subtraction software you can try, I haven't yet myself seen if it helps.

My testing also showed that the dots was worse with different colors (reds) in the image. Which made things hard with the red dirt and rocks of the outback the sky and trees were less affected.

I went back to the dpreview S2 5min test shot and you can see a lot of dots so I don't think it's a camera fault, but a 15-30sec shot may have issues.

 

[Jeroen V]

Hi,

thanks for the input. Just got word from Fuji. They want it in for repair. Oww but within warranty

Thanks again for the input

Jeroen

--
http://www.pbase.com/jeroenvisser