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Dave,
a still grab is enough. However, sorry for the confusion - my previous post was intended for Jake, of course. Edited accordingly. |
Sorry Piotr. I missed the "Jake" part. My IR issue looked like everybody elses.
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I've just checked my EX1 after it came back from BF adjustment and a Firmware update from 1.03 to 1.05. Although I had not checked for IR response prior to sending the unit back, it appears that I don't have this problem. The camera was checked outside under a clear blue sky, temperature 28C; subjects were black leather briefcase, black trousers and the black webbing on a PortaBrace camera bag. All subjects had been in direct sunlight for several hours and the camera had been white balanced. Time will tell whether the IR problem is still there, but I'm optimistic at the moment!
Geoff |
I thought warm light was the problem - not daylight?
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So if that's the case, why not just gel your light sources? Can you use some sort of IR blocking filter over the light ?
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Not all black materials will have the same IR issues, so just because something is black doesn't mean you are OK.
Also i would be extremely dubious if this could be fixed with a firmware update - though hope springs eternal. Does it matter if the black material is under daylight? In Adam Wilt's 3 camera test last month it was all done in a backyard and as I recall there were IR problems from more than one camera on a black shirt. - Lenny Levy |
Yes, some materials may cause the IR contamination even in daylight, but most that do, will do it even more in the warm, incendescent lighting (just usual bulbs indoors).
Most will only show it with the latter. Some (even though black) will not cause it at all; good example: car tyres are usually hot, but they are never rendered brownish! I am also pretty sure this is NOT firmware-fixable. |
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I have to agree that it is most unlikely that it could be fixed in firmware. However having said that I again tested the camera, this time under incandecent lamps and the only way that I could induce a hint of red/brown was by grossly over exposing or by pushing the gain up so much that noise was seen. For this test the subjects were a black laminate finish on a loudspeaker, black piano and a tripod bag. Not conclusive, but I'll try some more objects asap.
Geoff, |
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I hear you, Dave - why don't you just try? I cannot do that myself, as I hardly ever work in such fully controllable environments (most of my artificial light shootings being live concerts).
Besides, I have just replaced my otherwise great on-camera light (the Sony LED) with a regular, halogen lamp from PAG - just because the Sony didn't mix nicely with regular bulbs, especially on people faces; instead of gelling it amber I have chosen a better fit to start with. So, I guess I am a bit reluctant to the idea of gelling... However, for purely academic reasons, I am interested in your experiment results! |
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