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Old Jun 7, 2004, 2:53 PM   #1
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so, i went to my local camera store to get my anual sensor cleaning, i havent goten one in several months, and at f/22 there was dust, i thought....

the guy blew the sensor with caned air and said hedidnt see anything

i showed him a picture on the lcd and he said they were dead pixles.....i stoped breathing

however, i think (hope) he's wrong

here is a crop of a picture a f/22, can you tell me what this is?

keep in mind, it is a crop of a tiny part of the picture, the spots arent that big





thanks alot!

brad
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Old Jun 7, 2004, 3:13 PM   #2
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I doubt that is dead pixels causing that. More likely a dirty sensor. Canned air contains propellants and probably shouldn't be used to blow dust out of a camera. (just a question, how often do you get an "annual" sensor cleaning?). Just because the guy at the local store couldn't see dust on the lens with his naked eye doesn't mean that it isn't there.

I wouldn't put much faith on the image you see on your lcd to give you an accurate readout of dust.

This picture contains a LOT of noise, not uncommon for blue skies. You didn't mention what ISO you shot at.

Is this a repetitive pattern from shot to shot?
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Old Jun 7, 2004, 3:57 PM   #3
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Don't ignore lens dust either.

BTW, don't panic about problem pixels, they are as normal as defective sectors on a new hard drive...just do a pixel mapping (if you have that feature on your camera).
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Old Jun 7, 2004, 3:58 PM   #4
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this was iso 500, 1/400sec f/22

i'll take another one on a slower speed at iso 200 f/22 on a tripod for you

i try to get it cleaned every month, the camera shop is 2 mins down the road, and its free, the guy uses a speck graber, but he didnt this time, he just blew it with caned air....

if by reptitive pattern you mean the "specks" are in the same place, then yes



if they were dead, wouldnt they show up at all apatures? they dont show up at f/2.8









brad


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Old Jun 7, 2004, 4:12 PM   #5
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iso 200 1/125 f/22
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Old Jun 7, 2004, 4:14 PM   #6
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iso 200 1/4000 f/2.8
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Old Jun 7, 2004, 5:30 PM   #7
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oh ya, im useing a d100



thanks

brad
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Old Jun 7, 2004, 9:18 PM   #8
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It looks like itcould potentially be dust to me as well. At the least, I'd take it to another shop for a 2nd opinion .... perhaps take it to a Nikon Authorized if one is near. If it is dead pixels though, I'm pretty sure you cannot map them, but Nikon should be able to... for a fee I'm sure : (. Good luck.
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Old Jun 7, 2004, 10:44 PM   #9
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That is a dust problem, no doubt about it. A cleaning should be in order. I get my equipment serviced at Nikon in Melville all the time because they are really close by to me, and they do a great job too. Since I'm a walk-in customer they do the sensor cleaning for free, in about 5 minutes or less (more if they are really busy). As for dead pixels, I've brought my D100 four times to Nikon, and on all ocasions was not charged a penny. I don't know their policy for equipment shipped in to them.
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