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Old May 17, 2007, 4:28 AM   #1
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hey there folks.

was just playing round last ngiht with my D80 with the 18-135 lens on it.

was very late at night, had it in Manual mode and was just trying some long shutter speeds shots.



in both these pics there is Blue in the top corners of the pics.

is this just because of the camera/lenz picking up light reflecting off the building?

any ides what it could be....

i also see specs on the image but cant understand why as ive only ever changed lenses once and it was indoors.so i dont think it is dust ont he sensor.

i do see specs on the outside of my lens whihc im going to check with nikon SA about as i cant seem to wipe them off.

thanks guys.

Bryce






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Old May 17, 2007, 8:20 AM   #2
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Take an another shot from anyother place( be obervent if it is a moonless night, no any other light sourse near by,B'cpz ai 18 mm it catches many thing which at least I have't noticed )see if the problem persists then you need to consult Nikon Co.
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Old May 17, 2007, 8:34 AM   #3
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thanks for the response mcliu...



these are some of the responses i got on a site of ours in South Africa....

i suppose with the time diff more guys will repsond here when they awake :-)



Quote:

Amplifier glow. It's a problem with the D80.

Some of the components close to the sensor get warm during long exposures and this affects the image.

Nothing can be done about it.

Lots of discussions about this on DPReview. Thom Hogan also had a lot to say about this.


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Hi BBM

The light spots seem to be standard D80. Mine's and others that I have seen seen is more towards the middle of the top of the frame. I've seen it called 'Amp glow'. IIRC I've seen it discussed at Nikonians.org. I think it only appears with long exposures at higher ISO. You can do a test with the lenscap on.

I have the same problem with dust, although I never changed a lense. I presume the lense is sucking dust as it is expanding and contracting as you zoom in and out.

Nikon cleans sensors for free at their headoffice in Kyalami Park.


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You cannot do much about the amp glow except exhange it for another body and hope it is better. Nikonians forum also has a lot of discussion on the topic. The problem seems to affect bodies in a certain early serial number range more than others.

You could always take a reference pic with your lenscap using a similar exposure time, and subtract the reference pic from you night exposure in post-processing. This procedure is similar to the dust reference picture function that the D80 has.
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Old May 17, 2007, 9:22 AM   #4
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Ok So if the ampli glow is the problem.Then I have a very interesting suggestion(Some may not be agreeing with me).See the ampli glow prob may come up if the exposure- peroid is very very long ,may be sensor being heated up(?).To get around this .Use the multi-exposure capability of D-80.Let say three exposure on the tune of 2 -3 sec.(but you need to wait in between the exposure + place the cam on Tripod must)I mean instead of giving exposure at one go make it a small packet on the same frame.Well Try this method once
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Old May 17, 2007, 10:20 AM   #5
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sounds like a fun idea to try :-)


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