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Old Oct 6, 2004, 11:46 AM   #1
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All the various descriptions of the Rebel state there is a infra red filter in front of the sensor and that it acts as a low pass filter. That is an oxymoron, isn't it, as chopping off the infrared requires a high pass. Also it seems moredesirea ble to stop UV from hitting the sensors as they tend to be more sensitive at shorter wavelengths. Does anybody know what is going on here? Maybe an error got into the original factory release and has been copied everywhere.
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Old Oct 6, 2004, 12:06 PM   #2
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They have more than one filter integrated into the design.The low pass part of the filter is not for infrared. Here is a description:

http://www.canon.com/technology/deta...5mm/lo_filter/


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Old Oct 7, 2004, 5:57 PM   #3
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I found a really nifty web site @ http://infrareddreams.com/how_to_shoot_ir.htm that describes the IR response of sensors and the "hot glass" filter usually applied in front. Fascinating.That and Jims reference clears things up nicely. Thanks guys.
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