Author Topic: long exposure fault colour  (Read 3512 times)

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Offline sprint16v

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long exposure fault colour
« on: December 11, 2006, 02:49:24 PM »
 Has anyone else had any trouble with long exposures?
 Taking some pics of a park in London  > 20 secs they have consistently come out with an  patch with the  colour of smog.  ie pale brown. I'll post some examples haven't got the leads with me in London.
 I first noticed it some time ago but its time to find out more !the warranty runs out the 2nd Jan!
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Offline winjeel

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Re: long exposure fault colour
« Reply #1 on: December 13, 2006, 03:15:47 PM »
Oh dear, I haven't tried that one, just yet.
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Offline wayne

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Re: long exposure fault colour
« Reply #2 on: June 06, 2007, 05:21:40 PM »
this thread's a bit o/d but i think you might have experienced some sort of reciprocity failure maybe. read

http://en.wikipedia.org/wiki/Reciprocity_[photography]

or have a look at www.photonotes.org  that'll give all the technical info

Offline sprint16v

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Re: long exposure fault colour
« Reply #3 on: June 06, 2007, 07:33:54 PM »
this appears to have been a sensor heating issue.reciprocity only applies to film iiuc
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Offline Simon [aka springtide]

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Re: long exposure fault colour
« Reply #4 on: June 06, 2007, 08:07:43 PM »
I assume that these are at night, as you state > 20 secs.

The answer is no, I've not had any problems.  Take a look at the set of nighshoots I took over the weekend..

http://www.flickr.com/photos/82626168@N00/

Most were either 15 or 30 secs.

If they are not night, are you using a filter?   e.g.  BIG number ND?
« Last Edit: June 06, 2007, 08:11:40 PM by springtide »
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Offline wayne

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Re: long exposure fault colour
« Reply #5 on: June 09, 2007, 06:55:07 AM »
hmmmm...sorry about that inexplicable case of brainfade.... <grin>

wayne