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Author Topic: Bad experience  (Read 9931 times)
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geoff chandler
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« Reply #20 on: January 12, 2010, 2:09 AM »

UPDATE;
The D80 continued to perform better than it did from new
the only possible gripe is there seems to be at least one
hot pixal - but it doesn't show up all the time and, to be honest
I rarely spot it.
I would say, overall, I did benefit from having it overhauled
but I wouldn't want to go through that again without a spare,
similar quality, cam.

Has anyone else had issues with Hot pixals???
« Last Edit: January 13, 2010, 12:10 PM by geoff chandler » Logged

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scoundrel1728
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« Reply #21 on: January 12, 2010, 1:20 PM »

I recently purchased a used Nikon Coolpix 990 that turned out to have several hot pixels, probably ones that developed after the camera left the manufacturer.  I know that my Coolpix 950 developed a couple of hot pixels after I had it a year or two.  That camera had its share of them out of the box too.

Whether the improved performance is the result of better manufacturing control while processing the imagers, the larger pixels on dSLRs, hence less susceptiblity to the point defects than imagers on compact cameras, greater care in assembly and test at the camera manufacturers, or the fact that some cameras (more or less) automatically map out bad pixels, I hear of fewer complaints of hot pixels with newer equipment and with dSLRs than I used to.  Nevertheless, even with new equipment and dSLRs, hot pixels sometimes show up.  If a hot pixel shows up only occasionally on your camera, it isn't anything to worry about.

About a year ago, I temporarily brought my Coolpix 950 out of retirement because of its greater sensitivity to infrared than more modern cameras.  Here is a test shot of an infrared emitter.  A small blue-gray highlight at the bottom of the cylinder is the infrared emitter.  Several hot pixels can be seen near the top of the frame.

Apologies for the quality of the image, which was shot one-handed at one second.  My other hand is in the picture.
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« Reply #22 on: January 13, 2010, 12:08 PM »

Gosh - there seem to be quite a few hot pixals on that one!!!
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« Reply #23 on: January 15, 2010, 7:28 PM »

Will look out for hot pixels on the photographs I take on my Olympus E-VOLT 500
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« Reply #24 on: January 16, 2010, 5:17 AM »

Don't look too hard - if they aren't obvious - best not know about them - it will only upset you!!!
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« Reply #25 on: January 16, 2010, 7:21 AM »

Hot Pixels - Sounds like a good name for a porn photographer!
 2funny
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« Reply #26 on: January 16, 2010, 2:50 PM »

Been away from the keyboard for a while, but yes, there are quite a few hot pixels in my example shot.  Nevertheless, for the conditions under which I was shooting - 1 second at ISO 320 - and for a camera model of this vintage, this is normal.

And if you want to see a really noisy picture, take a look at this one from my (first) Coolpix 995 taken at ISO 200 for 60 seconds on a warm night.  This is as long as the 995 would let me expose, even in bulb mode.  The left half is a pixel crop of the original image; the right half, after using dark frame subtraction, gamma enhancement,  denoising, and conversion to monochrome.



Here is the whole image:



And here is a similar shot, taken many months later with a Canon 350D at ISO 1600 at 30 seconds:





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« Reply #27 on: January 16, 2010, 3:00 PM »

By the way, close examination of the original 350D shot shows several hot pixels, including two that I have found in the reduced version here, but you really have to look for them.
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« Reply #28 on: January 16, 2010, 4:22 PM »

I thought I'd found a new star constellation....:-(
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« Reply #29 on: January 16, 2010, 6:03 PM »

By comparison my D80 is really clear and clean!!
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« Reply #30 on: January 16, 2010, 6:05 PM »

So is my Olympus E-VOLT 500 - at the moment...
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« Reply #31 on: January 16, 2010, 6:40 PM »

The pattern of hot pixels is generally unique to each imager.  Nevertheless, they can become brighter or more numerous under certain conditions:

1. Longer exposure times
2. Higher ISO ratings
3. Higher imager temperatures.

As far as I can tell, the hot pixels obey the same inverse relationship between exposure time and ISO rating as pixels exposed by ordinary light.  That is, for a given exposure value and aperture, you get about the same appearance regardless of the exposure time and ISO rating.  However, you can still clean up the image by keeping the imager cool.  This is the technique used in devices used for astronomy, where the imagers may be cooled with liquid nitrogen.  Don't try that with your D80 though!
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« Reply #32 on: September 4, 2011, 1:23 PM »

Well - as I have discussed - My D80 after being fixed - developed a load more Hot Pixals - now totalling around 14.
So I decided to get a D90 before it went off the market, different sensor new cam new start!.
You guessed!!!
Within 200 photos 2 very bright Hot pixals have appeared!!
I am taking it in to Nikon personally - they are very sympathetic
and I hope they will come up with something to satisfy me
But I am so fed up about the whole affair I cannot convey how naff this is feeling!!

I will let them do whatever they can and then see how it goes

Chances are - if it's repaired and they return like the other one there
Might be a D80 and D90 and lenses for sale (complete with hot pixals thrown in for free!!)

I would draw the line there and stop using DSLR's!
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« Reply #33 on: December 4, 2012, 7:28 AM »

Update:
As those of you who know me will realise - I have been a bit out of the loop - still taking a few photos
but nothing like I used to.
The D90 was fixed under warrantee - but after just 2 weeks a couple of new Hot pixals appeared.
So I didn't use it much  during this year as we had other problems and concerns - untill we went
away for a holiday in barbados where I took loads!!
Arriving home I found all the low light pics literally smothered in Hot pixals
Normal light images had a few but feint and not all that obvious.
bad luck has followed me too long with cameras so I must get a decent break soon!!
Will take the cam back - but now it is out of warrantee I will be pleading with
Nikon to have pity on me (otherwise I will have to consider other options!)
So - I am sure folks will understand why photography had become a bit of a sore point
Oh - BTW - my Panasonic P&S is busted and will cost more than it's worth to repair!!!
take care all
Geoff
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« Reply #34 on: December 4, 2012, 9:06 AM »

Bad luck Geoff, that's really disappointing when you've taken loads of pics.  Show us an example?
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« Reply #35 on: December 4, 2012, 9:46 AM »

I will try - difficult to see ina reduced size image:
Here's a partial crop and resize...

« Last Edit: December 4, 2012, 10:01 AM by Willpower » Logged

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geoff chandler
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« Reply #36 on: December 4, 2012, 9:48 AM »

....and here's a crop pf just a small area only
in all there are over 15 or maybe many more - depending on light and ISO etc


« Last Edit: December 4, 2012, 10:01 AM by Willpower » Logged

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« Reply #37 on: December 4, 2012, 10:04 AM »

Sorry to see and hear this Geoff, how long did they warrant the repair for ?
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geoff chandler
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« Reply #38 on: December 4, 2012, 10:29 AM »

Hhh I dunno!
Lost the will a bit with it - long saga really starting with the previous cam..
Then My wife was ill for the first half of this year - so I didn't persue the few returning few Hot Pixals
- untill we had our Big anniversary holiday in Barbados - so I got the cam out and took loads of pics
which on the whole are superb - but these dreaded H/Pixals turned up en masse in low light/high ISO images
Told Nikon the story and they said bring it in and they will see what they can do - so I shall have to see
....
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