Reading mode: Light Dark

F30 - white dots in long time exposure

Go to last post
Cubensis said:
Wow, you are an angry little man. Sorry you are having whatever
"personality problems" you refer to. I'll leave you to fume and
TYPE IN ALL CAPS!!!!!! lol
Click to expand...
Don't worry Cubensis....keep onto your day job......your assesment of me like a lot of the stuff that comes from you is a mile off....i'm far from angry and definetly not little and believe me I wouldn't waste my energy fuming over you lol.... Good to see that when you lose out (once again) you end it all in typical Cubensis fashion ...with a personal insult. As for the type in caps....that's for your eyesight as you didn't seem to be able to grasp and acknowledge the fact that you called a dead pixel 'white and hot' in your post. Now go and play with your dead-white-hot-pixels!!

*************************************************************
Packy - very angry little man !!

http://homepage.eircom.net/~vmax ; for my pic stuff
 
Thx for sparing me the caps this time packy, hope you aren't too upset! Here, I'll repeat what I said in case you need to review it at a later point:

"Actually a dead pixel is associated with a black pixel... a "hot" pixel is one that is stuck in the on position resulting in a white dot where the pixel should be reading color. Hence, in both situations, hot pixels - and in both situations, on the CCD."

Read carefully before you fume next time. Maybe you won't worry about "losing out" and "personality issues" next time around. ;-)
packy said:
Cubensis said:
Wow, you are an angry little man. Sorry you are having whatever
"personality problems" you refer to. I'll leave you to fume and
TYPE IN ALL CAPS!!!!!! lol
Click to expand...
Don't worry Cubensis....keep onto your day job......your assesment
of me like a lot of the stuff that comes from you is a mile
off....i'm far from angry and definetly not little and believe me I
wouldn't waste my energy fuming over you lol.... Good to see that
when you lose out (once again) you end it all in typical Cubensis
fashion ...with a personal insult. As for the type in
caps....that's for your eyesight as you didn't seem to be able to
grasp and acknowledge the fact that you called a dead pixel 'white
and hot' in your post. Now go and play with your
dead-white-hot-pixels!!

*************************************************************
Packy - very angry little man !!

http://homepage.eircom.net/~vmax ; for my pic stuff
Click to expand...
 
The increased amplification at higher ISO's and the likelyhood that hot or stuck pixels will be more easily noticed in a dark scene are both on the mark as far as spotting white pixels goes. Extended shutter times will also make the appearance of the white pixels more prevalant, but all in all these flaws are inherent in the manufacture of CCD's - you'd be pressed to find a CCD based digital camera that didn't include these flaws to at least some degree. The amount, intensity, and noticeability will really effect whether you consider it a flaw worth returning your camera for - either for a repair or exchange.

In the case of the first example here, I don't think it is too bad, though viewed 100% after a long exposure in this case will probably make most results from any digital camera seem a bit troublesome. That is the problem with 100% viewing, it reveals how much detail, sharpness, etc. is coming out of the cam, but can ruin a users opinion of nearly any shot since nothing looks too pretty that magnified.
 
Kocho: Try a nearly pitch-black video... see if those white pixels appear on the video or LCD when preparing to take a video.
 
Cubensis said:
Thx for sparing me the caps this time packy, hope you aren't too
upset! Here, I'll repeat what I said in case you need to review it
at a later point:

"Actually a dead pixel is associated with a black pixel... a "hot"
pixel is one that is stuck in the on position resulting in a white
dot where the pixel should be reading color. Hence, in both
situations, hot pixels - and in both situations, on the CCD."

Read carefully before you fume next time. Maybe you won't worry
about "losing out" and "personality issues" next time around. ;-)
Click to expand...
hmmmm.....maybe you might give me some help since you are in the profession?? I could do with all the help I can get. Let me recap on things again and could you please respond to some simple questions that I have put to you here as you seem like a man with great knowledge. You can put your answers right under each question for me. Feel free to correct me where i'm wrong as well.

I said that the poster has white hot pixels from long exposure ...was I wrong in this assesment?

If my assesment is wrong then what is your explanation as to the cause of his woes?

Also I said to the poster that his problem was different to yours, because you said and put in writing for all to see that you had a dead pixel (you even typed it in caps!!), which in your own words is black...is this not correct?

You also agreed with me that a hot pixel and a dead pixel are not the same (correct?).

So don't this mean that the posters hot white pixel problem and your black dead pixel problem are totally different problems which I said to him in the first place??

By the way in your F30 dead pixel thread you have yet to make a single response on it and seem to be side stepping the issue. So here's the final question for you...do you have a dead pixel or a hot pixel on your camera??

Looking forward to your response......as always

**************************************************************
Packy

http://homepage.eircom.net/~vmax ; for my pic stuff
 
OK guys. I got my new f30, and I got snow up the a$$.

I can tell you the f30 does its own version of Dark Frame Subtraction....

In low light, I can actually see "hot pixels" ((or i'll call them 'hot blobs" since there seems to be large groupings of them)) on the LCD in low light! they are always the same and always in the same spot. after a photo is taken, the LCD will preview the image immediatly BEFORE doing any postprocessing and the Hot Blobs are quite visable, however they mostly dissapear before the file is written to memory. The 'Dark Frame' must be stored in the cameras firmware, and it does Subtraction based on that, rather then taking a second closed shutter shot everytime.

However... in my pics I'm still getting lotsa noise and Snow in my ISO 100 15 sec shots. I can even see the white dots at 3 seconds!!

Here are 2 examples from my camera. Both 15 sec exposures at ISO 100.
http://www.yousendit.com/transfer.php?action=download&ufid=6F9EB5972831F144

Long exposure shots are some of my favorite, and the quality is dissapointing. Is this normal for you guy's F30's? Or is my Camera bad?

I encourage everyone to post up their 'dim' 15 sec ISO 100-400 shots so we can compare and see where we should be standing with our own individual cameras.

I also have some solid black shots taken at ISO 100-400 if anyone needs to see.
 
"defective" pixels or downstream circuitry associated with specific pixels.

At least, this is my conclusion based on a quick follow-up test I did. Shot the same dimly lit scene at ISO 100, 400 and 1600 at 15s and in all shots there are faint white dots sprinkled here and there. There are only few bright dots that are visible in the ISO100 shot but the same spots are bright in the ISO400 and 1600, just brighter, plus there are additional dots that were not plainly visible in the ISO100 shot.

I would need to look carefully to see if there are also "dark" spots, which I will do tomorrow.

So, call it a "hot" or a "cold" pixel or plain noise, but they are there and are clearly visible at full magnification on the LCD screen, as long as there is some light in the frame (and not there if it is completely dark and the shot is at ISO100).
 
'So here's the final question for you...do you have a dead pixel or a hot pixel on your camera??"

To the best of my knowledge, and from what we have discussed, I would say it would best be described as a 'stuck', or perhaps a 'hot' pixel. Stuck as in it is always 'on', and hot as in it occurs more obviously in long exposures, high ISO's, and prolonged periods of the shutter being open... such as in videos.
packy said:
Cubensis said:
Thx for sparing me the caps this time packy, hope you aren't too
upset! Here, I'll repeat what I said in case you need to review it
at a later point:

"Actually a dead pixel is associated with a black pixel... a "hot"
pixel is one that is stuck in the on position resulting in a white
dot where the pixel should be reading color. Hence, in both
situations, hot pixels - and in both situations, on the CCD."

Read carefully before you fume next time. Maybe you won't worry
about "losing out" and "personality issues" next time around. ;-)
Click to expand...
hmmmm.....maybe you might give me some help since you are in the
profession?? I could do with all the help I can get. Let me recap
on things again and could you please respond to some simple
questions that I have put to you here as you seem like a man with
great knowledge. You can put your answers right under each question
for me. Feel free to correct me where i'm wrong as well.
I said that the poster has white hot pixels from long exposure
...was I wrong in this assesment?
If my assesment is wrong then what is your explanation as to the
cause of his woes?
Also I said to the poster that his problem was different to yours,
because you said and put in writing for all to see that you had a
dead pixel (you even typed it in caps!!), which in your own words
is black...is this not correct?
You also agreed with me that a hot pixel and a dead pixel are not
the same (correct?).
So don't this mean that the posters hot white pixel problem and
your black dead pixel problem are totally different problems which
I said to him in the first place??
By the way in your F30 dead pixel thread you have yet to make a
single response on it and seem to be side stepping the issue. So
here's the final question for you...do you have a dead pixel or a
hot pixel on your camera??

Looking forward to your response......as always

**************************************************************
Packy

http://homepage.eircom.net/~vmax ; for my pic stuff
Click to expand...
 
Okashira, yes Please see my initial post here and you will see
the "snow" appeared in the 8" shot in ISO100 picture.

tony
okashira said:
OK guys. I got my new f30, and I got snow up the a$$.

I can tell you the f30 does its own version of Dark Frame
Subtraction....
In low light, I can actually see "hot pixels" ((or i'll call them
'hot blobs" since there seems to be large groupings of them)) on
the LCD in low light! they are always the same and always in the
same spot. after a photo is taken, the LCD will preview the image
immediatly BEFORE doing any postprocessing and the Hot Blobs are
quite visable, however they mostly dissapear before the file is
written to memory. The 'Dark Frame' must be stored in the cameras
firmware, and it does Subtraction based on that, rather then taking
a second closed shutter shot everytime.

However... in my pics I'm still getting lotsa noise and Snow in my
ISO 100 15 sec shots. I can even see the white dots at 3 seconds!!

Here are 2 examples from my camera. Both 15 sec exposures at ISO 100.
http://www.yousendit.com/transfer.php?action=download&ufid=6F9EB5972831F144

Long exposure shots are some of my favorite, and the quality is
dissapointing. Is this normal for you guy's F30's? Or is my Camera
bad?

I encourage everyone to post up their 'dim' 15 sec ISO 100-400
shots so we can compare and see where we should be standing with
our own individual cameras.

I also have some solid black shots taken at ISO 100-400 if anyone
needs to see.
Click to expand...
 
Exactly what I found. Astronomical images are almost completely noise-free and contain the fixed pattern noise which is relatively easy to remove without hurting star details.

Bart
 
Cubensis said:
'So here's the final question for you...do you have a dead pixel or
a hot pixel on your camera??"

To the best of my knowledge, and from what we have discussed, I
would say it would best be described as a 'stuck', or perhaps a
'hot' pixel. Stuck as in it is always 'on', and hot as in it
occurs more obviously in long exposures, high ISO's, and prolonged
periods of the shutter being open... such as in videos.
Click to expand...
Thanks for trying to answer one of my questions out of the few 'tough' ones I posed for you.... You don't seem so 'concise' in your response, like in one of your replys to me below. Comments like "would be best described as" and "or perhaps a" don't sound so concise to me in your response to a simple question....is it dead (black) or is it hot (white)??....if anything your response seems to indicate that you are not 100% cetain as to what may be your problem with the F30 is.

So basically since you can't admit to the fact yourself and which I tried to get you to own up to in previous posts, was that you were wrong in your posting a while back in describing your problem as being a dead pixel on the F30....dead pixels show up black (0 in value on the sensor) and hot pixels show up white (255 value on the sensor). You said later that you have a white dot on the sensor/lcd which is in fact points to a hot pixel... stuck or otherwise...but certainly not a dead pixel as you originally claimed and what I based my imformation on in my response to the posters question.

This mis-information from you led me to believe that the problem with your F30 was a DEAD PIXEL (as you clearly stated typed in caps, in your thread) which is why in my response to the original poster I said that he had a totally different problem to you based on the facts you supplied in your thread, which from me, was a correct statement which you contested. But to me, you tried in vain to contest this because all the time you didn't really know what is going on with your camera and in fact now as it transpires you don't have a dead pixel at all but a stuck hot pixel as you point out above. Please excuse the angry typos in caps...it was copied and pasted from your thread!!
Enjoy!!....................

"Actually a dead pixel is associated with a black pixel... a "hot" pixel is one that is stuck in the on position resulting in a white dot where the pixel should be reading color."
Looks pretty concise to me.

************************************************************
Packy

http://homepage.eircom.net/~vmax ; for my pic stuff
 
i also noticed that in my indoor pics.
and i found maybe mine are more worse even than the foto you pasted.
i just can't say that 'some dots',there are really great mount of white dots.

while the pics took at short exposure, they seems to be lots of dark holes in the pics.
that is terrible.

have you noticed the similar things yet?
 
That sounds like a fairly serious CCD defect, especially if you are noticing such things at a short exposure - low ISO - viewed at normal size. Can you post an example?
 
Yeah I saw yours. it seems to be a bit worse then mine. I was hoping for more F30 owners to chime in
 
I'm experiencing these white dot issues as well .. I even see a distinctive one by using the night scene mode w/o the long exposure activated. Can someone who's sent the camera in for a replacement/repair comment on whether the issue was fixed? Sounds like some of the posters here are just accepting the behavior as is and planning to fix all long exposure shots with PP ... doesn't click well with me.

I'd like to hear someone chime in about NOT having these issues though. I'm not sure right now if its a problem with all F30s.
 
As another user who experienced a prominent one white pixel ... (try lowlight videos as well), I am waiting for mine to be returned by Fuji. Sent it in 8 days ago. Will post here when it returns.
 
You must log in or register to reply here.

Keyboard shortcuts

f
Forum
m
My threads
Mobile site
About
Editorial content
Cameras & Lenses
Community
All content, design, and layout are Copyright © 1998–2025 Digital Photography Review All Rights Reserved.
Reproduction in whole or part in any form or medium without specific written permission is prohibited.
When you use DPReview links to buy products, the site may earn a commission.
©GPS Media - Guides, Products, Services.
Back
Top