Wow, that was hard to find. I scanned the big image for quite a while before I spotted that slight intensity change, about 1-2 pixels wide, running vertically through the whole frame.
I think it supremely unlikely that that's from an optical source (like florescent flicker), but I could well believe it's electrical interference (RFI probably). So, film cameras do still have a use. :-) BTW, what happens to it if you use a noise reduction filter on that image? An artifact like that should be perceived as noise and greatly reduced. On Wed, Jan 18, 2012 at 9:23 AM, Collin Brendemuehl <[email protected]> wrote: > Here is an example (full, so have bandwidth before clicking) > http://www.brendemuehl.net/images/IMG16533.JPG > Just a couple of pixels wide, but affecting some parts of the image. > > and here is just the upper left corner where you can see the band > (without having to load a monster image) > http://www.brendemuehl.net/images/IMG16533if.jpg > > where you can see the vertical band. > > So I spent some time @ WorldOfUsedPhotography (a new, local > used equipment shop) with one who knows DSLR tech inside and out. > I was told that none of the cameras are immune to this type of interference. > He has seen this before. It's just the nature of the technology. > > While his experience showed it to be the fluorescent lights in work areas, > I also wonder if it might be things like milling equipment and other > machines that generate a good quantity of hash. > > It *only* happened when I am in the work area, > and *always* happened when I shoot out there. > It is in the identical position on each image shot in that location. > It is a question of electrical interference with the sensor. > > Sincerely, > > Collin Brendemuehl > "He is no fool who gives what he cannot keep to gain what he cannot lose" > -- Jim Elliott -- -bmw -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
