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Hi Carl
After removing the IR filter, you need to replace it with a clear one of exactly the same thickness. Otherwise Auto Focusing will become useless. Once modified you have to customise white balance by either a grey card or a piece of white paper or even just shoot something grey. From my experience it can be clumpsy and although you can get away with it most of the time I found the colour balance is still off a bit. Bright red always looks brownish. Eventually I bought another 40d for day time use.
I had my 400d modified by Eric 2 years ago but he is not doing it anymore.
Cheers
Vincent
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